StackRadar

CVE-2026-56866

High

Advisory

Published 8 Oct 2026In the index since 9 Oct 2026
Severity
High
worst across findings
CVSS
7.5
base score, highest
EPSS
0.003
22nd percentile
CISA KEV
Not listed
no confirmed exploitation
Charts affected
5,220
of 18,137 indexed, latest versions
Container images
6,032
deployed by those charts
Fix available
1 of 2
affected packages

HTTP/1 client connection desynchronization after CONNECT rejection in net/http

Carried by container images the latest versions of 5,220 of 18,137 indexed charts deploy, on 6,032 images.

Affected packageAffected versionsFixed inImages
stdlibgolanggo1.13, go1.13.1, go1.13.3, go1.13.4+208 more1.26.96,032
golang-1.19deb1.19.8-2no fix listed1
OSV records
DEBIAN-CVE-2026-56866GO-2026-6605
Trending
Rank 10 in indexed charts, since 9 Oct 2026. See the ranking →

Charts affected

5,220 by stars
ChartLatestAffected imagesRadar Score
category-microservicebusi-adsVerified publisher1.0.01 of 2See more

category-microservice busi-ads 1.0.0

1 of the 2 container images this version deploys carry CVE-2026-56866.

Container imageDigestPackageFixed in
library/mongo:latestbac22ea7710d
stdlib@go1.26.8
1.26.9

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12,458
pages-microservicebusi-adsVerified publisher1.0.01 of 3See more

pages-microservice busi-ads 1.0.0

1 of the 3 container images this version deploys carry CVE-2026-56866.

Container imageDigestPackageFixed in
library/mysql:8.07dcddc01f13b
stdlib@go1.24.6
1.26.9

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21,457
butane-operatorbutane-operatorVerified publisher0.3.02 of 2See more

butane-operator butane-operator 0.3.0

2 of the 2 container images this version deploys carry CVE-2026-56866.

Container imageDigestPackageFixed in
ghcr.io/naval-group/butane-operator:v0.1.1-rc285818b510780
stdlib@go1.26.0
1.26.9
registry.k8s.io/kubebuilder/kube-rbac-proxy:v0.16.0771a9a173e03
stdlib@go1.21.7
1.26.9

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2,510
butlercibutlerciVerified publisher0.1.01 of 1See more

butlerci butlerci 0.1.0

1 of the 1 container images this version deploys carry CVE-2026-56866.

Container imageDigestPackageFixed in
etejeda/butlerci:0.1.0737d58183abc
stdlib@go1.16.3
1.26.9

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3,711
accelerationbuttahtoastVerified publisher0.1.01 of 1See more

acceleration buttahtoast 0.1.0

1 of the 1 container images this version deploys carry CVE-2026-56866.

Container imageDigestPackageFixed in
goharbor/harbor-acceld:0.2.13451103a6c8d8
stdlib@go1.21.5
1.26.9

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2,110
fluobuttahtoastVerified publisher0.1.01 of 1See more

fluo buttahtoast 0.1.0

1 of the 1 container images this version deploys carry CVE-2026-56866.

Container imageDigestPackageFixed in
ghcr.io/flatcar/flatcar-linux-update-operator:v0.10.0-rc1f9063e20b1f6
stdlib@go1.20.6
1.26.9

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1,992
kubermatic-operatorbuttahtoastVerified publisher2.24.51 of 1See more

kubermatic-operator buttahtoast 2.24.5

1 of the 1 container images this version deploys carry CVE-2026-56866.

Container imageDigestPackageFixed in
quay.io/kubermatic/kubermatic:v2.24.5ebba936046ab
stdlib@go1.20.6
1.26.9

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3,568
kubevirt-managerbuttahtoastVerified publisher0.1.31 of 1See more

kubevirt-manager buttahtoast 0.1.3

1 of the 1 container images this version deploys carry CVE-2026-56866.

Container imageDigestPackageFixed in
kubevirtmanager/kubevirt-manager:1.3.3df3ea27d4a9e
stdlib@go1.21.7
1.26.9

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2,147
gotenbergbysamioVerified publisher0.2.01 of 1See more

gotenberg bysamio 0.2.0

1 of the 1 container images this version deploys carry CVE-2026-56866.

Container imageDigestPackageFixed in
gotenberg/gotenberg:8-chromium0d28ae9a9644
stdlib@go1.27.1
1.26.9

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10,520
mariadbbysamioVerified publisher1.0.21 of 1See more

mariadb bysamio 1.0.2

1 of the 1 container images this version deploys carry CVE-2026-56866.

Container imageDigestPackageFixed in
library/mariadb:12.0.2607835cd628b
stdlib@go1.24.6
1.26.9

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3,683
payloadboxbyteforkVerified publisher0.0.41 of 1See more

payloadbox bytefork 0.0.4

1 of the 1 container images this version deploys carry CVE-2026-56866.

Container imageDigestPackageFixed in
ghcr.io/bytefork/payloadbox:0.0.73e0164e975b3
stdlib@go1.26.3
1.26.9

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309
caddycaddyVerified publisher0.0.41 of 1See more

caddy caddy 0.0.4

1 of the 1 container images this version deploys carry CVE-2026-56866.

Container imageDigestPackageFixed in
library/caddy:2.11.2-alpine834468128c76
stdlib@go1.26.0
1.26.9

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2,186
etcdcagriekinVerified publisher0.1.51 of 1See more

etcd cagriekin 0.1.5

1 of the 1 container images this version deploys carry CVE-2026-56866.

Container imageDigestPackageFixed in
quay.io/coreos/etcd:v3.5.16d967d98a12dc
stdlib@go1.22.7
1.26.9

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1,458
kafkacagriekinVerified publisher0.2.01 of 2See more

kafka cagriekin 0.2.0

1 of the 2 container images this version deploys carry CVE-2026-56866.

Container imageDigestPackageFixed in
danielqsj/kafka-exporter:v1.9.04150e46b2e96
stdlib@go1.24.0
1.26.9

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3,141
rediscagriekinVerified publisher1.5.21 of 2See more

redis cagriekin 1.5.2

1 of the 2 container images this version deploys carry CVE-2026-56866.

Container imageDigestPackageFixed in
oliver006/redis_exporter:v1.67.0120f7ec77293
stdlib@go1.23.4
1.26.9

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2,066
calibre-web-automatedcalibre-web-automatedVerified publisher1.2.31 of 1See more

calibre-web-automated calibre-web-automated 1.2.3

1 of the 1 container images this version deploys carry CVE-2026-56866.

Container imageDigestPackageFixed in
crocodilestick/calibre-web-automated:v4.0.6c31a738b6d5e
stdlib@go1.17.8
1.26.9

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8,265
ct-singlecalltelemetry0.8.44 of 7See more

ct-single calltelemetry 0.8.4

4 of the 7 container images this version deploys carry CVE-2026-56866.

Container imageDigestPackageFixed in
library/nats:2.8.4-alpine988010f74b61
stdlib@go1.17.10
1.26.9
natsio/nats-box:0.11.09fbf7bf684e4
stdlib@go1.18.1
1.26.9
natsio/nats-server-config-reloader:0.7.2911ce7ed2f55
stdlib@go1.19
1.26.9
natsio/prometheus-nats-exporter:0.10.016048afb67a5
stdlib@go1.19
1.26.9

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13,879
stablecalltelemetry0.7.14 of 9See more

stable calltelemetry 0.7.1

4 of the 9 container images this version deploys carry CVE-2026-56866.

Container imageDigestPackageFixed in
library/nats:2.8.4-alpine988010f74b61
stdlib@go1.17.10
1.26.9
natsio/nats-box:0.11.09fbf7bf684e4
stdlib@go1.18.1
1.26.9
natsio/nats-server-config-reloader:0.7.2911ce7ed2f55
stdlib@go1.19
1.26.9
natsio/prometheus-nats-exporter:0.10.016048afb67a5
stdlib@go1.19
1.26.9

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11,119
stable-hacalltelemetry0.11.43 of 7See more

stable-ha calltelemetry 0.11.4

3 of the 7 container images this version deploys carry CVE-2026-56866.

Container imageDigestPackageFixed in
library/nats:2.10.12-alpinebca70839d953
stdlib@go1.21.8
1.26.9
natsio/nats-box:0.14.2e808e0644ce1
stdlib@go1.21.5
1.26.9
natsio/nats-server-config-reloader:0.14.10d50270fa374
stdlib@go1.20.5
1.26.9

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6,288
pagescamden-pages1.0.01 of 3See more

pages camden-pages 1.0.0

1 of the 3 container images this version deploys carry CVE-2026-56866.

Container imageDigestPackageFixed in
library/mysql:8.07dcddc01f13b
stdlib@go1.24.6
1.26.9

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21,457
camellia-redis-proxycamellia-redis-proxy1.4.01 of 2See more

camellia-redis-proxy camellia-redis-proxy 1.4.0

1 of the 2 container images this version deploys carry CVE-2026-56866.

Container imageDigestPackageFixed in
library/redis:5.0fc5ecd863862
stdlib@go1.16.7
1.26.9

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9,746
geoservercamptocamp20.0.31 of 12See more

geoserver camptocamp2 0.0.3

1 of the 12 container images this version deploys carry CVE-2026-56866.

Container imageDigestPackageFixed in
library/postgres:122f2a8c2a7d10
stdlib@go1.18.2
1.26.9

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92,886
bucket-clonercamptocamp31.0.41 of 1See more

bucket-cloner camptocamp3 1.0.4

1 of the 1 container images this version deploys carry CVE-2026-56866.

Container imageDigestPackageFixed in
camptocamp/bucket-cloner:latestacfafc308d88
stdlib@go1.16.5
1.26.9

Open the chart page →

6,788
getconfigcamptocamp30.1.11 of 1See more

getconfig camptocamp3 0.1.1

1 of the 1 container images this version deploys carry CVE-2026-56866.

Container imageDigestPackageFixed in
quay.io/oauth2-proxy/oauth2-proxy:v7.3.08c21390be87d
stdlib@go1.17.10
1.26.9

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3,218
prometheus-puppetdb-sdcamptocamp38.0.21 of 2See more

prometheus-puppetdb-sd camptocamp3 8.0.2

1 of the 2 container images this version deploys carry CVE-2026-56866.

Container imageDigestPackageFixed in
ghcr.io/camptocamp/prometheus-puppetdb-sd:0.14.0414c0c99fd06
stdlib@go1.23.5
1.26.9

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7,038
redisoperatorcamptocamp33.0.11 of 1See more

redisoperator camptocamp3 3.0.1

1 of the 1 container images this version deploys carry CVE-2026-56866.

Container imageDigestPackageFixed in
quay.io/spotahome/redis-operator:latest8c772955184e
stdlib@go1.20.7
1.26.9

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1,883
s3-exportercamptocamp32.2.01 of 1See more

s3-exporter camptocamp3 2.2.0

1 of the 1 container images this version deploys carry CVE-2026-56866.

Container imageDigestPackageFixed in
ribbybibby/s3-exporter:v0.5.0998184c51a00
stdlib@go1.15.15
1.26.9

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2,159
snyk-exportercamptocamp30.1.41 of 1See more

snyk-exporter camptocamp3 0.1.4

1 of the 1 container images this version deploys carry CVE-2026-56866.

Container imageDigestPackageFixed in
quay.io/lunarway/snyk_exporter:v1.11.155e5cc5aaa0a
stdlib@go1.17.7
1.26.9

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1,976
ssl-exportercamptocamp30.1.01 of 1See more

ssl-exporter camptocamp3 0.1.0

1 of the 1 container images this version deploys carry CVE-2026-56866.

Container imageDigestPackageFixed in
ribbybibby/ssl-exporter:2.4.2718abe7f5e79
stdlib@go1.18.3
1.26.9

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2,617
terraboardcamptocamp32.4.01 of 1See more

terraboard camptocamp3 2.4.0

1 of the 1 container images this version deploys carry CVE-2026-56866.

Container imageDigestPackageFixed in
ghcr.io/camptocamp/terraboard:v2.3.0df53e2c8998c
stdlib@go1.21.3
1.26.9

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2,038
apachecamptocamp-apache0.4.01 of 2See more

apache camptocamp-apache 0.4.0

1 of the 2 container images this version deploys carry CVE-2026-56866.

Container imageDigestPackageFixed in
quay.io/lusitaniae/apache-exporter:latest438b1b6177eb
stdlib@go1.25.11
1.26.9

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1,878
mapservercamptocamp-apache0.1.101 of 2See more

mapserver camptocamp-apache 0.1.10

1 of the 2 container images this version deploys carry CVE-2026-56866.

Container imageDigestPackageFixed in
camptocamp/mapserver:master18959d939a66
stdlib@go1.26.5
1.26.9

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1,603
caninecanine0.1.106 of 7See more

canine canine 0.1.10

6 of the 7 container images this version deploys carry CVE-2026-56866.

Container imageDigestPackageFixed in
library/traefik:v3.7.16b9cbca6fac4
stdlib@go1.25.10
1.26.9
ghcr.io/caninehq/canine:latest68b19aee1c64
stdlib@go1.24.4
1.26.9
quay.io/jetstack/cert-manager-cainjector:v1.15.3e0ce8ae280c8
stdlib@go1.22.5
1.26.9
quay.io/jetstack/cert-manager-controller:v1.15.3eee34b3de2dd
stdlib@go1.22.5
1.26.9
quay.io/jetstack/cert-manager-startupapicheck:v1.15.34cbc1b022a23
stdlib@go1.22.5
1.26.9
quay.io/jetstack/cert-manager-webhook:v1.15.3fdcb9ac4963f
stdlib@go1.22.5
1.26.9

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18,681
cert-managercanine1.15.34 of 4See more

cert-manager canine 1.15.3

4 of the 4 container images this version deploys carry CVE-2026-56866.

Container imageDigestPackageFixed in
quay.io/jetstack/cert-manager-cainjector:v1.15.3e0ce8ae280c8
stdlib@go1.22.5
1.26.9
quay.io/jetstack/cert-manager-controller:v1.15.3eee34b3de2dd
stdlib@go1.22.5
1.26.9
quay.io/jetstack/cert-manager-startupapicheck:v1.15.34cbc1b022a23
stdlib@go1.22.5
1.26.9
quay.io/jetstack/cert-manager-webhook:v1.15.3fdcb9ac4963f
stdlib@go1.22.5
1.26.9

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5,157
traefikcanine40.2.01 of 1See more

traefik canine 40.2.0

1 of the 1 container images this version deploys carry CVE-2026-56866.

Container imageDigestPackageFixed in
library/traefik:v3.7.16b9cbca6fac4
stdlib@go1.25.10
1.26.9

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1,462
capi2argo-cluster-operatorcapi2argo1.5.01 of 1See more

capi2argo-cluster-operator capi2argo 1.5.0

1 of the 1 container images this version deploys carry CVE-2026-56866.

Container imageDigestPackageFixed in
ghcr.io/dntosas/capi2argo-cluster-operator:v1.5.0fb8c6457ef6e
stdlib@go1.25.6
1.26.9

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693
capsule-argo-addoncapsule-argo-addonVerified publisher0.8.02 of 2See more

capsule-argo-addon capsule-argo-addon 0.8.0

2 of the 2 container images this version deploys carry CVE-2026-56866.

Container imageDigestPackageFixed in
clastix/kubectl:v1.3122918a06c253
stdlib@go1.22.5
1.26.9
ghcr.io/peak-scale/capsule-argo-addon:0.8.064b8c5389b33
stdlib@go1.27.1
1.26.9

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1,934
freebox-exportercaptnbpVerified publisher1.0.01 of 1See more

freebox-exporter captnbp 1.0.0

1 of the 1 container images this version deploys carry CVE-2026-56866.

Container imageDigestPackageFixed in
captnbp/freebox-exporter:1.0.0-r01600c5a253e0
stdlib@go1.21.3
1.26.9

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1,381
ranchercarbide-charts2.15.22 of 2See more

rancher carbide-charts 2.15.2

2 of the 2 container images this version deploys carry CVE-2026-56866.

Container imageDigestPackageFixed in
rancher/rancher:v2.15.20c3d8e570255
stdlib@go1.26.4
1.26.9
rancher/shell:v0.8.21eeed72d4eda
stdlib@go1.26.8
1.26.9

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2,602
stigatroncarbide-charts0.4.13 of 10See more

stigatron carbide-charts 0.4.1

3 of the 10 container images this version deploys carry CVE-2026-56866.

Container imageDigestPackageFixed in
library/nats:2.10.5-alpine85319e5e541b
stdlib@go1.21.4
1.26.9
natsio/nats-box:0.14.1a67913df95f1
stdlib@go1.21.3
1.26.9
natsio/nats-server-config-reloader:0.13.0b3359eeb10bf
stdlib@go1.20.5
1.26.9

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6,243
pagescarina-pages1.0.01 of 3See more

pages carina-pages 1.0.0

1 of the 3 container images this version deploys carry CVE-2026-56866.

Container imageDigestPackageFixed in
library/mysql:8.07dcddc01f13b
stdlib@go1.24.6
1.26.9

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21,457
pagescarmel-pages-dell1.0.01 of 3See more

pages carmel-pages-dell 1.0.0

1 of the 3 container images this version deploys carry CVE-2026-56866.

Container imageDigestPackageFixed in
library/mysql:8.07dcddc01f13b
stdlib@go1.24.6
1.26.9

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21,457
cassandra-webcassandra-web0.1.01 of 1See more

cassandra-web cassandra-web 0.1.0

1 of the 1 container images this version deploys carry CVE-2026-56866.

Container imageDigestPackageFixed in
ipushc/cassandra-web:latestfa3e0c66c289
stdlib@go1.20.2
1.26.9

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2,092
castai-evictorcastaiVerified publisher0.35.1483 of 3See more

castai-evictor castai 0.35.148

3 of the 3 container images this version deploys carry CVE-2026-56866.

Container imageDigestPackageFixed in
ghcr.io/castai/images/cpa/cpvpa:v0.8.14dd5743f37f60
stdlib@go1.26.5
1.26.9
ghcr.io/castai/images/evictor:v0.35.148937cc7ab4d5d
stdlib@go1.26.6
1.26.9
registry.k8s.io/kubectl:v1.35.64d8c68e8c2bf
stdlib@go1.25.11
1.26.9

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1,005
castai-tetragoncastaiVerified publisher0.6.12 of 4See more

castai-tetragon castai 0.6.1

2 of the 4 container images this version deploys carry CVE-2026-56866.

Container imageDigestPackageFixed in
quay.io/cilium/tetragon-ci:b6f3056a3f6cf05e366a3e07348f7c0b6265a60f5efd991d218b
stdlib@go1.19.2
1.26.9
quay.io/cilium/tetragon-operator:v0.8.34ab8e6604204
stdlib@go1.18.3
1.26.9

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6,149
castai-watchdogcastaiVerified publisher0.2.4821 of 1See more

castai-watchdog castai 0.2.482

1 of the 1 container images this version deploys carry CVE-2026-56866.

Container imageDigestPackageFixed in
ghcr.io/castai/images/watchdog:v0.2.4828f70018e61ca
stdlib@go1.26.6
1.26.9

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324
castware-componentscastaiVerified publisher0.4.01 of 1See more

castware-components castai 0.4.0

1 of the 1 container images this version deploys carry CVE-2026-56866.

Container imageDigestPackageFixed in
lachlanevenson/k8s-kubectl:v1.25.4af5cea3f2e40
stdlib@go1.19.3
1.26.9

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4,310
oci-csi-drivercastaiVerified publisher1.13.86 of 7See more

oci-csi-driver castai 1.13.8

6 of the 7 container images this version deploys carry CVE-2026-56866.

Container imageDigestPackageFixed in
registry.k8s.io/sig-storage/csi-attacher:v4.12.0b9dc9a714a48
stdlib@go1.26.3
1.26.9
registry.k8s.io/sig-storage/csi-node-driver-registrar:v2.17.0f9de845b1701
stdlib@go1.26.3
1.26.9
registry.k8s.io/sig-storage/csi-provisioner:v6.3.0a4b0b1a37605
stdlib@go1.26.3
1.26.9
registry.k8s.io/sig-storage/csi-resizer:v2.2.0a2d40c1c3ccb
stdlib@go1.26.3
1.26.9
registry.k8s.io/sig-storage/csi-snapshotter:v8.6.042af0929bcd6
stdlib@go1.26.3
1.26.9
registry.k8s.io/sig-storage/snapshot-controller:v8.6.081e79f205083
stdlib@go1.26.3
1.26.9

Open the chart page →

3,778
temporalcastaiVerified publisher0.54.210 of 14See more

temporal castai 0.54.2

10 of the 14 container images this version deploys carry CVE-2026-56866.

Container imageDigestPackageFixed in
grafana/grafana:11.0.00dc5a246ab16
stdlib@go1.21.10
1.26.9
temporalio/admin-tools:1.26.237e2e33dbd7b
stdlib@go1.22.5
1.26.9
temporalio/server:1.26.21e2626efcbc1
stdlib@go1.23.2
1.26.9
temporalio/ui:2.33.05c586a3c8ec5
stdlib@go1.23.0
1.26.9
quay.io/prometheus-operator/prometheus-config-reloader:v0.74.0d55631c7a740
stdlib@go1.22.3
1.26.9
quay.io/prometheus/alertmanager:v0.27.0e13b6ed5cb92
stdlib@go1.21.7
1.26.9
quay.io/prometheus/node-exporter:v1.8.1fa7fa12a57ef
stdlib@go1.22.3
1.26.9
quay.io/prometheus/prometheus:v2.53.0075b1ba2c4eb
stdlib@go1.22.4
1.26.9
quay.io/prometheus/pushgateway:v1.8.0c159e946abf4
stdlib@go1.22.1
1.26.9
registry.k8s.io/kube-state-metrics/kube-state-metrics:v2.12.0b401fae262a5
stdlib@go1.21.8
1.26.9

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23,149
catalyst-agentscatalyst-agents0.1.3514 of 18See more

catalyst-agents catalyst-agents 0.1.35

14 of the 18 container images this version deploys carry CVE-2026-56866.

Container imageDigestPackageFixed in
alpine/k8s:1.32.3eec354133193
stdlib@go1.23.6
1.26.9
grafana/grafana:13.1.3ab5cb380e3ff
stdlib@go1.26.5
1.26.9
grafana/loki:3.0.0757b5fadf816
stdlib@go1.21.9
1.26.9
grafana/loki-canary:3.0.028d7c00588aa
stdlib@go1.21.9
1.26.9
grafana/tempo:2.5.0f0200a9bff6d
stdlib@go1.21.3
1.26.9
otel/opentelemetry-collector-contrib:0.156.0125bdbeb7590
stdlib@go1.26.4
1.26.9
prom/memcached-exporter:v0.14.2d8a61419b841
stdlib@go1.21.5
1.26.9
ghcr.io/chaos-mesh/chaos-coredns:v0.2.838bfdf5e3774
stdlib@go1.25.5
1.26.9
ghcr.io/chaos-mesh/chaos-daemon:v2.8.369b1d3c09cfa
stdlib@go1.25.11
1.26.9
ghcr.io/chaos-mesh/chaos-mesh:v2.8.3bdb31f3121a2
stdlib@go1.25.11
1.26.9
ghcr.io/jkroepke/kube-webhook-certgen:1.8.5d0e80b2f62fe
stdlib@go1.26.5
1.26.9
quay.io/prometheus-operator/prometheus-operator:v0.93.0a001ed10a382
stdlib@go1.26.5
1.26.9
quay.io/prometheus/node-exporter:v1.12.1-distroless8c9bac11973b
stdlib@go1.26.5
1.26.9
registry.k8s.io/kube-state-metrics/kube-state-metrics:v2.19.185108987d044
stdlib@go1.26.4
1.26.9

Open the chart page →

24,985

Container images carrying it

6,032 by charts deploying them

A fixed version is listed for 1 of the 2 affected packages.

No deployed image carries CVE-2026-56866.

syft 1.42.1 · advisories as of 15 Oct 2026

Corrections: contact@stackradar.io

Catalogue: Artifact Hub · Advisories: OSV · Exploitation: FIRST EPSS, CISA KEV.