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: 5,276; of 18,137 indexed, latest versions
Container images: 6,115; 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 5,276 of 18,137 indexed charts deploy, on 6,115 images.

Affected package	Affected versions	Fixed in	Images
stdlibgolang	go1.13, go1.13.1, go1.13.3, go1.13.4+208 more	1.26.9	6,115
golang-1.19deb	1.19.8-2	no fix listed	1

OSV records: DEBIAN-CVE-2026-56866 GO-2026-6605
Trending: Rank 12 in indexed charts, since 9 Oct 2026. See the ranking →

Charts affected

5,276 by stars

Chart

Latest

Affected images

Radar Score

nfs-subdir-external-provisionerxxl-job-admin

4.0.18

1 of 1 See more

nfs-subdir-external-provisioner xxl-job-admin 4.0.18

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

Container image	Digest	Package	Fixed in
registry.k8s.io/sig-storage/nfs-subdir-external-provisioner :v4.0.2	63d5e04551ec	stdlib@go1.15	1.26.9

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4,005

nightingalexxl-job-admin

0.2.11

4 of 6 See more

nightingale xxl-job-admin 0.2.11

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

Container image	Digest	Package	Fixed in
flashcatcloud/categraf :latest	42e6ab16472e	stdlib@go1.25.14	1.26.9
flashcatcloud/nightingale :8.0.0-beta.11	ea1b0aaabe09	stdlib@go1.23.9	1.26.9
library/mysql :5.7	4bc6bc963e6d	stdlib@go1.18.2	1.26.9
quay.io/prometheus/prometheus :v2.54.1	f6639335d34a	stdlib@go1.22.6	1.26.9

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12,782

redisxxl-job-admin

24.1.3

1 of 1 See more

redis xxl-job-admin 24.1.3

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

Container image	Digest	Package	Fixed in
ghcr.io/dellnoantechnp/bitnami/redis :8.4.0	29064423c369	stdlib@go1.25.6	1.26.9

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613

pgbounceryasn77-pgbouncer

0.0.8

1 of 1 See more

pgbouncer yasn77-pgbouncer 0.0.8

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

Container image	Digest	Package	Fixed in
ghcr.io/yasn77/pgbouncer :v0.0.6	cc8c13550e44	stdlib@go1.18.6	1.26.9

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1,899

ygdrassil-monitoringygdrassil

0.4.0

7 of 10 See more

ygdrassil-monitoring ygdrassil 0.4.0

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

Container image	Digest	Package	Fixed in
grafana/grafana :11.5.1	5781759b3d27	stdlib@go1.23.5	1.26.9
prom/alertmanager :v0.28.0	d5155cfac40a	stdlib@go1.23.4	1.26.9
quay.io/prometheus-operator/prometheus-config-reloader :v0.79.2	193280a33bc1	stdlib@go1.23.4	1.26.9
quay.io/prometheus/node-exporter :v1.8.2	4032c6d5bfd7	stdlib@go1.22.5	1.26.9
quay.io/prometheus/prometheus :v3.1.0	6559acbd5d77	stdlib@go1.23.4	1.26.9
quay.io/prometheus/pushgateway :v1.11.0	99392035ae99	stdlib@go1.23.4	1.26.9
registry.k8s.io/kube-state-metrics/kube-state-metrics :v2.14.0	37d841299325	stdlib@go1.23.3	1.26.9

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13,875

ceph-exporterygqygq2

1.0.0

1 of 1 See more

ceph-exporter ygqygq2 1.0.0

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

Container image	Digest	Package	Fixed in
digitalocean/ceph_exporter :latest	19b163e3fb95	stdlib@go1.20	1.26.9

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6,880

mdbygqygq2

5.0.7

1 of 1 See more

170

mod-chartygqygq2

5.1.0

1 of 1 See more

mod-chart ygqygq2 5.1.0

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

Container image	Digest	Package	Fixed in
bitnami/nginx :latest	b8d42f076789	stdlib@go1.26.8	1.26.9

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170

prometheusalertygqygq2

1.0.0

1 of 1 See more

prometheusalert ygqygq2 1.0.0

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

Container image	Digest	Package	Fixed in
feiyu563/prometheus-alert :v4.9.1	224cfa68cbd9	stdlib@go1.20.6	1.26.9

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2,372

utcookygqygq2

2.1.4

1 of 1 See more

utcook ygqygq2 2.1.4

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

Container image	Digest	Package	Fixed in
bitnami/nginx :latest	b8d42f076789	stdlib@go1.26.8	1.26.9

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170

matrixdb-operatorymatrix

0.13.0

1 of 2 See more

matrixdb-operator ymatrix 0.13.0

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

Container image	Digest	Package	Fixed in
matrixdb/kubebuilder_kube-rbac-proxy :v0.12.0	ed3c7e6291e8	stdlib@go1.18.1	1.26.9

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2,994

rawfile-csiymatrix

0.2.1

4 of 4 See more

rawfile-csi ymatrix 0.2.1

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

Container image	Digest	Package	Fixed in
matrixdb/custom-external-provisioner :4622a07d7-20220424	7e9ffe249a51	stdlib@go1.17.8	1.26.9
matrixdb/rawfile-csi :v0.2.1	95b2e38e913d	stdlib@go1.17.9	1.26.9
matrixdb/sig-storage_csi-node-driver-registrar :v2.2.0	ba763bb01ddc	stdlib@go1.16	1.26.9
matrixdb/sig-storage_livenessprobe :v2.3.0	7ab06fe3d8a7	stdlib@go1.16	1.26.9

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12,492

nginx-vts-exporterymrs

0.1.2

1 of 1 See more

nginx-vts-exporter ymrs 0.1.2

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

Container image	Digest	Package	Fixed in
sophos/nginx-vts-exporter :latest	f1073556b29b	stdlib@go1.13.6	1.26.9

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2,470

version-checkerymrs

0.2.3

1 of 1 See more

version-checker ymrs 0.2.3

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

Container image	Digest	Package	Fixed in
quay.io/jetstack/version-checker :v0.2.1	5f6f8ba0b671	stdlib@go1.15.2	1.26.9

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4,267

prometheus-monitoring-stackyotron-helm-charts

1.2.0

3 of 3 See more

prometheus-monitoring-stack yotron-helm-charts 1.2.0

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

Container image	Digest	Package	Fixed in
grafana/grafana :latest	b28bae15e219	stdlib@go1.26.7	1.26.9
quay.io/prometheus/alertmanager :latest	e9733bafb1bd	stdlib@go1.26.8	1.26.9
quay.io/prometheus/prometheus :latest	efd719c99d83	stdlib@go1.27.1	1.26.9

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904

ical-filter-proxyyungwood

0.3.1

1 of 1 See more

ical-filter-proxy yungwood 0.3.1

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

Container image	Digest	Package	Fixed in
yungwood/ical-filter-proxy :0.3.1	ddc3f30ab05f	stdlib@go1.26.5	1.26.9

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259

synergy-wholesale-exporteryungwood

0.1.1

1 of 1 See more

synergy-wholesale-exporter yungwood 0.1.1

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

Container image	Digest	Package	Fixed in
yungwood/synergy-wholesale-exporter :0.1.1	054dce85989b	stdlib@go1.26.5	1.26.9

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259

zahori-consulzahori

1.0.1

2 of 2 See more

zahori-consul zahori 1.0.1

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

Container image	Digest	Package	Fixed in
hashicorp/consul :1.15.3	ddff34041c5c	stdlib@go1.20.4	1.26.9
hashicorp/consul-k8s-control-plane :1.1.2	62bed1bf8106	stdlib@go1.20.4	1.26.9

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6,702

zahori-moonzahori

1.0.1

3 of 3 See more

zahori-moon zahori 1.0.1

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

Container image	Digest	Package	Fixed in
quay.io/aerokube/moon :2.5.1	a8837b00ba1c	stdlib@go1.20.4	1.26.9
quay.io/aerokube/moon-conf :2.5.1	9ca307b30080	stdlib@go1.20.4	1.26.9
quay.io/aerokube/moon-ui :2.0.5	89990b146824	stdlib@go1.20.5	1.26.9

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5,024

zahori-schedulerzahori

1.0.1

1 of 1 See more

zahori-scheduler zahori 1.0.1

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

Container image	Digest	Package	Fixed in
zahoriaut/zahori-scheduler :1.0.0	47d0979b1184	stdlib@go1.20.5	1.26.9

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3,136

jenkinszanise-jenkins-helm-chart

0.1.0

1 of 1 See more

jenkins zanise-jenkins-helm-chart 0.1.0

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

Container image	Digest	Package	Fixed in
jenkins/jenkins :lts	a660310e39ad	stdlib@go1.27.0	1.26.9

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2,212

posthogzeet

0.23.2

2 of 9 See more

posthog zeet 0.23.2

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

Container image	Digest	Package	Fixed in
altinity/clickhouse-operator :0.19.0	7a85f522c5bc	stdlib@go1.17.13	1.26.9
altinity/metrics-exporter :latest	a5206c713de7	stdlib@go1.26.8	1.26.9

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4,840

endlessh-gozekker6

0.4.0

1 of 1 See more

endlessh-go zekker6 0.4.0

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

Container image	Digest	Package	Fixed in
ghcr.io/shizunge/endlessh-go :2026.0730.0	8826dad32623	stdlib@go1.26.5	1.26.9

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827

karmazekker6

0.22.0

1 of 1 See more

karma zekker6 0.22.0

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

Container image	Digest	Package	Fixed in
lmierzwa/karma :v0.133	f5d0a0ff4062	stdlib@go1.27.1	1.26.9

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148

zookeeper-exporterzookeeper-exporter

0.1.0

1 of 1 See more

zookeeper-exporter zookeeper-exporter 0.1.0

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

Container image	Digest	Package	Fixed in
dabealu/zookeeper-exporter :latest	86106fec315f	stdlib@go1.14.15	1.26.9

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2,294

zoo-project-druzoo-project

0.10.9

2 of 6 See more

zoo-project-dru zoo-project 0.10.9

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

Container image	Digest	Package	Fixed in
library/postgres :18.6-alpine3.24	77f585114c32	stdlib@go1.24.6	1.26.9
zooproject/zoo-project :dru-51e7d55383f24594959b69e58518961c6aa66740	da112e8d03f1	stdlib@go1.26.8	1.26.9

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7,310

Container images carrying it

6,115 by charts deploying them

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

Container image	Digest	Package	Fixed in	Used by
ghcr.io/appscode/vcd-lb-gc :v0.1.0	524c4045cd21	stdlib@go1.25.11	1.26.9	1
ghcr.io/appscode/virtual-secrets-server :v0.4.0	efa03f4c9551	stdlib@go1.25.12	1.26.9	1
ghcr.io/aquasecurity/trivy-operator :0.16.0	a608b798fda5	stdlib@go1.20.4	1.26.9	1
ghcr.io/arch-anes/homer-operator :0.3.4	04e3b7d1bfa6	stdlib@go1.26.7	1.26.9	1
ghcr.io/argelbargel/vault-raft-snapshot-agent :v0.12.5	345174727a2b	stdlib@go1.23.10	1.26.9	1
ghcr.io/argonix-io/argonix-api :0.6.5	431abcce7c1e	stdlib@go1.22.7	1.26.9	1
ghcr.io/arpa-network/node-client :latest	657a2c9f6e6d	stdlib@go1.22.5	1.26.9	1
ghcr.io/aserto-dev/topaz :0.32.59	4c708ecf7dc4	stdlib@go1.24.2	1.26.9	1
ghcr.io/ashvinbambhaniya/nexus-tasks-backend :2.0.0	f80349eb018b	stdlib@go1.26.0	1.26.9	1
ghcr.io/astradns/astradns-agent :v0.2.9-unbound	6ba69487f1b0	stdlib@go1.26.1	1.26.9	1
ghcr.io/astradns/astradns-operator :v0.2.9	09e58b62416a	stdlib@go1.26.1	1.26.9	1
ghcr.io/astriaorg/astria-indexer :0.1.0	5cf1e5709820	stdlib@go1.23.1	1.26.9	1
ghcr.io/astriaorg/astria-indexer-api :0.1.0	3490d9900af1	stdlib@go1.23.1	1.26.9	1
ghcr.io/astriaorg/astrotrek :0.1.0	5889bea38e56	stdlib@go1.20.12	1.26.9	1
ghcr.io/astriaorg/flame :0.1.0	c8af1c5aae40	stdlib@go1.22.12	1.26.9	1
ghcr.io/astriaorg/ria-faucet :0.0.1	a06c8ebef427	stdlib@go1.17.13	1.26.9	1
ghcr.io/astriaorg/seq-faucet :0.9.0	bf3cb9b505b6	stdlib@go1.22.6	1.26.9	1
ghcr.io/atolat/open-cache :latest	d6105dd73eb4	stdlib@go1.25.8	1.26.9	1
ghcr.io/atrox/alertmanager-discord :v1.0.0	ac011a4b6df1	stdlib@go1.20.5	1.26.9	1
ghcr.io/attestkeep/attestkeep-k8s :1.3.7	1fbf69c89003	stdlib@go1.26.4	1.26.9	1
ghcr.io/aureum-cloud/cloudflare-ddns :latest	aeb75d1605f4	stdlib@go1.23.12	1.26.9	1
ghcr.io/aureum-cloud/frp-operator :v1.0.1	96b01d7e7025	stdlib@go1.24.13	1.26.9	1
ghcr.io/authelia/authelia :4.39.24	8f428b06bb07	stdlib@go1.27.1	1.26.9	1
ghcr.io/autobrr/autobrr :v1.10.0	d4022cd32df5	stdlib@go1.19.3	1.26.9	1
ghcr.io/autobrr/qui :v1.14.1	10b7945d4f09	stdlib@go1.25.7	1.26.9	1
ghcr.io/automata-network/multi-prover-avs/operator :v0.6.0	752f1aa02438	stdlib@go1.22.1	1.26.9	1
ghcr.io/automation64/toolbox/oraclelinux-9-toolbox :latest	7af2216c7b9e	stdlib@go1.26.4	1.26.9	1
ghcr.io/avistotelecom/kubebrowser :0.10.0	a354b8dc7e6a	stdlib@go1.24.1	1.26.9	1
ghcr.io/axonops/axonops-developer-operator :v0.1.0	b3d6600c8ba5	stdlib@go1.22.10	1.26.9	1
ghcr.io/axonops/axonops-operator :0.1.0	e0cdb993f0b1	stdlib@go1.25.9	1.26.9	1
ghcr.io/b100to/idle-reaper :0.1.4	47b4a0e091f0	stdlib@go1.26.7	1.26.9	1
ghcr.io/bamaas/gofit :0.0.1	32b6a174b419	stdlib@go1.22.11	1.26.9	1
ghcr.io/bank-vaults/bank-vaults :v1.33.1	98b6ea2ed319	stdlib@go1.26.3	1.26.9	1
ghcr.io/bank-vaults/vault-secrets-webhook :v1.23.1	98baf045a1c9	stdlib@go1.26.4	1.26.9	1
ghcr.io/banzaicloud/kafka-operator :v0.25.1	13dcbc7ebfc6	stdlib@go1.19.11	1.26.9	1
ghcr.io/banzaicloud/kafka-operator :v0.20.2	e341aefa9a90	stdlib@go1.17.6	1.26.9	1
ghcr.io/banzaicloud/logging-operator :3.17.6	23c2d4d54a64	stdlib@go1.17.9	1.26.9	1
ghcr.io/banzaicloud/log-socket :latest	a514736d2d4d	stdlib@go1.18.6	1.26.9	1
ghcr.io/base-org/node :v0.11.1	1aba0ffe55ea	stdlib@go1.22.10	1.26.9	1
ghcr.io/bbdsoftware/litellm-operator :1.1.2	167a51113d90	stdlib@go1.26.2	1.26.9	1
ghcr.io/beezlabs-org/cloudflare-tunnel-operator :v0.1.0	9afcd070940f	stdlib@go1.17.12	1.26.9	1
ghcr.io/behappy-project/behappy-tencentcloud-exporter :0.1.3	a0ba56e1501b	stdlib@go1.21.13	1.26.9	1
ghcr.io/beluga-cloud/helm-dashboard/dashboard :1.3.3	9ab9a675c405	stdlib@go1.20.8	1.26.9	1
ghcr.io/benc-uk/kubeview :latest	45b64d7c7016	stdlib@go1.27.1	1.26.9	1
ghcr.io/benc-uk/kubeview :0.1.31	f8e7cd7325a3	stdlib@go1.17.2	1.26.9	1
ghcr.io/bionicstork/bionicstork/relay :latest	978a59e0f79f	stdlib@go1.25.14	1.26.9	1
ghcr.io/biru-scop/tenzu-front :latest	16759fa523f8	stdlib@go1.26.3	1.26.9	1
ghcr.io/bitmagnet-io/bitmagnet :v0.10	b6373349a301	stdlib@go1.23.6	1.26.9	1
ghcr.io/bitmagnet-io/bitmagnet :v0.10.0	cf2c16fac5b5	stdlib@go1.23.6	1.26.9	1
ghcr.io/bitwarden/admin :2026.9.2	e82f37409cce	stdlib@go1.26.5	1.26.9	1