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
buall/postgres-stack :18.6	881a785642cb	stdlib@go1.24.6	1.26.9	1
buddyspencer/gickup :0.10.38	6b656f19b0c1	stdlib@go1.22.5	1.26.9	1
buddyspencer/gickup :0.10.30	9e7dbf923c12	stdlib@go1.21.9	1.26.9	1
buildkite/agent :3.25.0	aec38cfaae0e	stdlib@go1.14.7	1.26.9	1
bulich/domain-exporter :latest	6d0b780f7c7b	stdlib@go1.20.4	1.26.9	1
burganbank/vault-initializer :v1	9259c34e4037	stdlib@go1.22.2	1.26.9	1
burningalchemist/sql_exporter :0.16.0	b8e4757c7def	stdlib@go1.23.2	1.26.9	1
byjg/static-httpserver :0.5.1	bed29f3f45e8	stdlib@go1.26.8	1.26.9	1
bytebase/bytebase :latest	0b3a44dfac3e	stdlib@go1.27.1	1.26.9	1
bytesafe/bytesafe-ce :v1.0.4	ee287384c005	stdlib@go1.20.5	1.26.9	1
caarlos0/domain_exporter :v1.23.0	d11dec138900	stdlib@go1.21.6	1.26.9	1
calico/cni :v3.28.0	cef0c907b8f4	stdlib@go1.22.2	1.26.9	1
calico/cni :v3.28.1	e486870cfde8	stdlib@go1.22.5	1.26.9	1
calico/kube-controllers :v3.28.0	8f04e4772a2b	stdlib@go1.22.3	1.26.9	1
calico/kube-controllers :v3.28.1	eadb3a25109a	stdlib@go1.22.5	1.26.9	1
calico/node :v3.28.0	385bf6391fea	stdlib@go1.22.3	1.26.9	1
calico/node :v3.28.1	d8c644a8a3ee	stdlib@go1.22.5	1.26.9	1
camptocamp/bucket-cloner :latest	acfafc308d88	stdlib@go1.16.5	1.26.9	1
camptocamp/mapserver :master	18959d939a66	stdlib@go1.26.5	1.26.9	1
captnbp/freebox-exporter :1.0.0-r0	1600c5a253e0	stdlib@go1.21.3	1.26.9	1
caroga/commentoplusplus :v1.8.7	f3233882b3bd	stdlib@go1.15.15	1.26.9	1
casbin/casdoor :v1.224.0	66f836ef778b	stdlib@go1.17.5	1.26.9	1
casbin/casdoor :v1.753.0	770ad9ec3190	stdlib@go1.20.12	1.26.9	1
casbin/casdoor :4.20.0	afaafe1c58a3	stdlib@go1.25.8	1.26.9	1
castopod/castopod :1.12.10	1fd37280cbb2	stdlib@go1.21.13	1.26.9	1
castopod/castopod :1.15.5	4e4f0440520f	stdlib@go1.25.7	1.26.9	1
cbeneke/hcloud-fip-controller :v0.4.1	dc658078d7ba	stdlib@go1.15.3	1.26.9	1
censedata/floating-server :v1.6.3	ebfffb9dd4c0	stdlib@go1.24.3	1.26.9	1
certimate/certimate :v0.4.34	ff42541a047b	stdlib@go1.25.14	1.26.9	1
cesanta/docker_auth :1.14.0	98e0307e0d2d	stdlib@go1.24.4	1.26.9	1
cfcontainerization/cf-operator :v2.3.0-0.g27a91cdf	82fa261c18a8	stdlib@go1.13.3	1.26.9	1
cfcontainerization/quarks-job :v0.0.0-0.g70ae34b	58fb1c173a46	stdlib@go1.13.4	1.26.9	1
cfssl/cfssl :latest	a32a90480788	stdlib@go1.27.1	1.26.9	1
cfssl/cfssl :latest :v1.6.5	c9018c2ddf0b	stdlib@go1.20.14	1.26.9	1
cgtysylr/cluster-octopus :1.0.0	aec0f8a38a77	stdlib@go1.20.8	1.26.9	1
chaerr/kridge :demo-operator-v0.1.2	66833deec017	stdlib@go1.20.7	1.26.9	1
chainflag/eth-faucet :latest	ac642796bcb6	stdlib@go1.17.13	1.26.9	1
chainsafe/lodestar :v1.27.0	7b9fe4aa8073	stdlib@go1.20.12	1.26.9	1
chainsafe/lodestar :latest	c13eac6aada7	stdlib@go1.23.1	1.26.9	1
chandanteekinavar/findery-market-payment-service :1.0	c96f759b6ce4	stdlib@go1.19.13	1.26.9	1
chaosnative/cle-auth-server :2.7.0	72ee352bc333	stdlib@go1.16.15	1.26.9	1
chaosnative/cle-license-module :2.7.0	62cf6adc355e	stdlib@go1.16.15	1.26.9	1
chaosnative/cle-server :2.7.0	e7bcff4a20c0	stdlib@go1.16.15	1.26.9	1
charmcli/soft-serve :v0.4.0	39523c1a6ba8	stdlib@go1.18.5	1.26.9	1
checkmk/check-mk-community :2.5.0p6	c11b422210c4	stdlib@go1.26.3	1.26.9	1
chibisafe/chibisafe-server :latest	3da4fcbc1a18	stdlib@go1.20.12	1.26.9	1
chirpstack/chirpstack-application-server :3.17.6	e0b23dfd24d6	stdlib@go1.17.8	1.26.9	1
chirpstack/chirpstack-application-server :3	fb7667fe037f	stdlib@go1.19.3	1.26.9	1
chirpstack/chirpstack-gateway-bridge :3.13.2	ce3f2cdca8a9	stdlib@go1.17.5	1.26.9	1
chirpstack/chirpstack-network-server :3	c0bbbb7a3f1e	stdlib@go1.19.3	1.26.9	1