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
quay.io/jetstack/cert-manager-cainjector :v1.10.1	b5657161d2c2	stdlib@go1.19.3	1.26.9	1
quay.io/jetstack/cert-manager-cainjector :v1.8.2	c010246124c2	stdlib@go1.17.11	1.26.9	1
quay.io/jetstack/cert-manager-cainjector :v1.12.0	e0a5b06b231c	stdlib@go1.20.4	1.26.9	1
quay.io/jetstack/cert-manager-cainjector :v1.8.0	e7b6203ccb37	stdlib@go1.17.8	1.26.9	1
quay.io/jetstack/cert-manager-cainjector :v1.19.3	eb1df56668b6	stdlib@go1.25.6	1.26.9	1
quay.io/jetstack/cert-manager-controller :v1.10.1	1143471c90db	stdlib@go1.19.3	1.26.9	1
quay.io/jetstack/cert-manager-controller :v1.12.0	4a9d0264055b	stdlib@go1.20.4	1.26.9	1
quay.io/jetstack/cert-manager-controller :v1.18.2	81316365dc0b	stdlib@go1.24.4	1.26.9	1
quay.io/jetstack/cert-manager-controller :v1.14.5	9c0527cab629	stdlib@go1.21.9	1.26.9	1
quay.io/jetstack/cert-manager-controller :v1.19.3	a07125af5e83	stdlib@go1.25.6	1.26.9	1
quay.io/jetstack/cert-manager-controller :v1.8.2	a20c44021a5d	stdlib@go1.17.11	1.26.9	1
quay.io/jetstack/cert-manager-controller :v1.16.1	ae5e14401cde	stdlib@go1.23.2	1.26.9	1
quay.io/jetstack/cert-manager-controller :v1.20.0	b9009aa6b45b	stdlib@go1.26.1	1.26.9	1
quay.io/jetstack/cert-manager-controller :v1.8.0	e1642bf8e933	stdlib@go1.17.8	1.26.9	1
quay.io/jetstack/cert-manager-csi-driver :v0.16.0	9d13db6dc80e	stdlib@go1.26.5	1.26.9	1
quay.io/jetstack/cert-manager-csi-driver-spiffe :v0.15.0	1755a3802efd	stdlib@go1.26.5	1.26.9	1
quay.io/jetstack/cert-manager-csi-driver-spiffe-approver :v0.15.0	5f7a9bbb95fb	stdlib@go1.26.5	1.26.9	1
quay.io/jetstack/cert-manager-ctl :v1.13.2	4d9fce2c050e	stdlib@go1.20.10	1.26.9	1
quay.io/jetstack/cert-manager-ctl :v1.8.0	595c548dee6f	stdlib@go1.17.8	1.26.9	1
quay.io/jetstack/cert-manager-ctl :v1.8.2	81b2d775edad	stdlib@go1.17.11	1.26.9	1
quay.io/jetstack/cert-manager-ctl :v1.12.0	8d54fe9d0c0d	stdlib@go1.20.4	1.26.9	1
quay.io/jetstack/cert-manager-google-cas-issuer :v0.13.0	0d6a852d7c6a	stdlib@go1.27.1	1.26.9	1
quay.io/jetstack/cert-manager-istio-csr :v0.18.0	495dcdad72a4	stdlib@go1.27.1	1.26.9	1
quay.io/jetstack/cert-manager-startupapicheck :v1.14.5	0f5b104bdd1b	stdlib@go1.21.9	1.26.9	1
quay.io/jetstack/cert-manager-startupapicheck :v1.18.2	1075e0974151	stdlib@go1.24.4	1.26.9	1
quay.io/jetstack/cert-manager-startupapicheck :v1.20.0	54da63c9964d	stdlib@go1.26.1	1.26.9	1
quay.io/jetstack/cert-manager-startupapicheck :v1.16.1	b4a5e42f6dbf	stdlib@go1.23.2	1.26.9	1
quay.io/jetstack/cert-manager-startupapicheck :v1.19.3	e51a06251338	stdlib@go1.25.6	1.26.9	1
quay.io/jetstack/cert-manager-webhook :v1.20.0	2133daae1f08	stdlib@go1.26.1	1.26.9	1
quay.io/jetstack/cert-manager-webhook :v1.19.3	2625754083d5	stdlib@go1.25.6	1.26.9	1
quay.io/jetstack/cert-manager-webhook :v1.10.1	64121721c665	stdlib@go1.19.3	1.26.9	1
quay.io/jetstack/cert-manager-webhook :v1.16.1	6edf44244b2a	stdlib@go1.23.2	1.26.9	1
quay.io/jetstack/cert-manager-webhook :v1.18.2	9431f0d8b510	stdlib@go1.24.4	1.26.9	1
quay.io/jetstack/cert-manager-webhook :v1.8.2	ada7edd90bec	stdlib@go1.17.11	1.26.9	1
quay.io/jetstack/cert-manager-webhook :v1.12.0	ec4306b243d9	stdlib@go1.20.4	1.26.9	1
quay.io/jetstack/cert-manager-webhook :v1.14.5	ef419261a209	stdlib@go1.21.9	1.26.9	1
quay.io/jetstack/cert-manager-webhook :v1.8.0	fd798a5a773e	stdlib@go1.17.8	1.26.9	1
quay.io/jetstack/kube-oidc-proxy :v0.3.0	e045b26eb6df	stdlib@go1.14.1	1.26.9	1
quay.io/jetstack/trust-manager :v0.25.0	0521921c2a46	stdlib@go1.27.1	1.26.9	1
quay.io/jetstack/trust-pkg-debian-trixie :20250419.2	3093d4f6634f	stdlib@go1.27.1	1.26.9	1
quay.io/jetstack/version-checker :v0.11.0	eae9a374d22f	stdlib@go1.26.4	1.26.9	1
quay.io/jiralert/jiralert-linux-amd64 :v1.3.0	1983aa64761a	stdlib@go1.19.6	1.26.9	1
quay.io/jupyterhub/k8s-image-awaiter :4.4.3	65c3383861bd	stdlib@go1.23.12	1.26.9	1
quay.io/jupyterhub/k8s-image-awaiter :3.3.7	ada70832a345	stdlib@go1.18.10	1.26.9	1
quay.io/jupyterhub/k8s-image-awaiter :3.2.1	f65b644ed6db	stdlib@go1.18.10	1.26.9	1
quay.io/k3rnel-pan1c/uptime-kuma :1.19.3	f975fde9329b	stdlib@go1.19.4	1.26.9	1
quay.io/k8start/http-headers :1.2.0	c7a9987f2ac5	stdlib@go1.19.2	1.26.9	1
quay.io/k8tz/k8tz :0.20.0	361628e53fc8	stdlib@go1.25.12	1.26.9	1
quay.io/keycloak/keycloak-operator :19.0.3-legacy	09d52508fee9	stdlib@go1.13.8	1.26.9	1
quay.io/keycloak/keycloak-operator :19.0.2-legacy	15fa0ed662b1	stdlib@go1.13.8	1.26.9	1