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: 5,323; of 18,117 indexed, latest versions
Container images: 6,150; 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 5,323 of 18,117 indexed charts deploy, on 6,150 images.

Affected package	Affected versions	Fixed in	Images
stdlibgolang	go1.13, go1.13.1, go1.13.3, go1.13.4+212 more	1.26.9	6,150
golang-1.19deb	1.19.8-2	no fix listed	1

OSV records: DEBIAN-CVE-2026-56866 GO-2026-6605
Trending: Rank 10 in indexed charts, since 9 Oct 2026. See the ranking →

Charts affected

5,323 by stars

Chart

Latest

Affected images

Radar Score

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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1,883

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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13,849

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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6,860

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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2,366

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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12,474

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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863

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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6,700

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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5,025

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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3,117

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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2,134

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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4,799

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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7,286

Container images carrying it

6,150 by charts deploying them

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

Container image	Digest	Package	Fixed in	Used by
amazon/cloudwatch-agent :1.300032.2b361	73b79b02f03a	stdlib@go1.21.5	1.26.9	1
amazon/cloudwatch-agent :1.247350.0b251780	e745d1783c93	stdlib@go1.15.15	1.26.9	1
ambassador/aes-authsvc :v4.0.0-preview.1	2a4598b03a6a	stdlib@go1.20.6	1.26.9	1
ambassador/aes-eg-ext :v4.0.0-preview.1	b7eb1be3345d	stdlib@go1.20.6	1.26.9	1
ambassador/aes-wafsvc :v4.0.0-preview.1	5fc571509b8c	stdlib@go1.20.6	1.26.9	1
ambassador/ambassador-agent :1.0.22	7a1ea0d934fb	stdlib@go1.21.5	1.26.9	1
amd64/mysql :5.7	e20a653e0f51	stdlib@go1.18.2	1.26.9	1
anamskenneth/recipe_frontend :2025-06-07	9ecf04f42cc3	stdlib@go1.20.12	1.26.9	1
anchore/anchore-engine :v0.10.0	bde9eedf639d	stdlib@go1.16.3	1.26.9	1
anchore/kai :v0.5.0	8aad6d0912dd	stdlib@go1.19.7	1.26.9	1
andrcuns/dependabot-gitlab :7.7.0-alpha.1	43060f159f4c	stdlib@go1.26.5	1.26.9	1
andrcuns/smocker :0.18.5	b4a8eb20581a	stdlib@go1.18.10	1.26.9	1
andreacioni/kube-workload-restarter :0.0.24	2938b310090a	stdlib@go1.20.2	1.26.9	1
andrewmackrodt/firefox-x11 :142.0.1-r1	33f9080470c9	stdlib@go1.18.2	1.26.9	1
ankane/pgvector :v0.5.1	d3a9d8ac27bb	stdlib@go1.18.2	1.26.9	1
anonaddy/anonaddy :0.12.3	957a95565166	stdlib@go1.18.3	1.26.9	1
ansgroup/cert-manager-webhook-safedns :v1.0.1	cd6b0ef2b309	stdlib@go1.13.15	1.26.9	1
ansiblesemaphore/semaphore :v2.8.53	03d1f8684027	stdlib@go1.16.3	1.26.9	1
antrea/antrea-agent-ubuntu :v2.7.0	c10bc45c6272	stdlib@go1.25.7	1.26.9	1
antrea/antrea-controller-ubuntu :v2.7.0	f1373d39217c	stdlib@go1.26.6	1.26.9	1
antrea/antrea-ui-backend :v0.8.0	19f3c0113330	stdlib@go1.26.8	1.26.9	1
antrea/flow-aggregator :v2.7.0	065193e7572f	stdlib@go1.26.6	1.26.9	1
anujarosha/hello-go :v1.0.1	ed60e46870b6	stdlib@go1.18.3	1.26.9	1
anujdatar/cups :25.07.01	685df04a643b	stdlib@go1.19.8	1.26.9	1
apache/airflow :2.8.4-python3.9	64e58748b6b9	stdlib@go1.21.8	1.26.9	1
apache/airflow :airflow-pgbouncer-exporter-2025.03.05-0.18.0	adf7260c2c5f	stdlib@go1.23.7	1.26.9	1
apache/airflow :2.10.2-python3.9	ce90bdc3d2af	stdlib@go1.22.7	1.26.9	1
apache/airflow :2.8.1	e5560ad0b86e	stdlib@go1.19.8	1.26.9	1
apache/answer :2.0.2	a0d71b0e30a5	stdlib@go1.25.12	1.26.9	1
apache/apisix-dashboard :2.9.0	c010ea7d1694	stdlib@go1.14.15	1.26.9	1
apache/apisix-ingress-controller :1.3.0	412f92cde0b3	stdlib@go1.13.8	1.26.9	1
apache/camel-k :1.10.4	3bb13d14f64a	stdlib@go1.17.13	1.26.9	1
apache/camel-k :2.11.0	d173e7efe258	stdlib@go1.26.5	1.26.9	1
apache/shardingsphere-operator :0.3.0	ffe68d6b99c0	stdlib@go1.19.10	1.26.9	1
apache/skywalking-oap-server :9.2.0	133d35d2c263	stdlib@go1.16.9	1.26.9	1
apache/skywalking-oap-server :8.9.1	b4ec8c18d079	stdlib@go1.16.9	1.26.9	1
apache/solr-operator :v0.9.1	4db34508137f	stdlib@go1.22.12	1.26.9	1
apache/tika :3.3.1.0	90b7fa1dc018	stdlib@go1.26.2	1.26.9	1
apache/tika :latest-full	ab9cc988828c	stdlib@go1.26.7	1.26.9	1
apache/yunikorn :scheduler-1.10.0	49fc54894fdf	stdlib@go1.26.7	1.26.9	1
apache/yunikorn :web-1.10.0	90e6a62a578a	stdlib@go1.26.7	1.26.9	1
apache/yunikorn :admission-1.10.0	95c6b951f38a	stdlib@go1.26.7	1.26.9	1
apecloud/dt-platform :0.1.1	d48bcbd38066	stdlib@go1.19.11	1.26.9	1
apecloud/gemini-scheduler :0.1.1	5832d1a9097a	stdlib@go1.22.7	1.26.9	1
apecloud/kb-cloud-installer :v2.1.42-certified	98abc64aa985	stdlib@go1.20.11	1.26.9	1
apecloud/kubeblocks-csi-driver :0.1.3	c93655ccb2d7	stdlib@go1.19.13	1.26.9	1
apecloud/kubetran-platform :latest	32bd92c7f7fa	stdlib@go1.20.8	1.26.9	1
apecloud/pyroscope :0.37.2	dbca95a15bc1	stdlib@go1.19.6	1.26.9	1
apecloud/smartfs-csi-driver :0.1.1	ff2858eab9cc	stdlib@go1.19.13	1.26.9	1
appwrite/appwrite :1.9.0	1aaa70127114	stdlib@go1.25.7	1.26.9	1