CVE-2026-56853

highpriority · track · 0EPSS 0.006 · 47 %ileDEEUFRUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.57% (47th) EPSS

CVSS 7.5 · high

Is it mine?

23 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · osv · cert_bund

EPSS · scored 2026-10-27

When a server is configured to support unencrypted HTTP/2, it reads a few bytes from each new connection to see if they contain the HTTP/2 client preface. ReadHeaderTimeout is unexpectedly not being applied when doing this.

cvss

Technical severity, 0–10. One row per scoring source.

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.9–7.5

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · ENISA EU

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondaryexploitability 3.9 · impact 3.6

v3.16.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: yes · Technical Impact: partialcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-770US

affected products (23)

Products and version ranges known to be affected.

Amazon Linux 2all versionscert_bundDEcpe:/o:amazon:linux_2:-
NetApp StorageGRIDall versionscert_bundDEcpe:/a:netapp:storagegrid:-
NetApp Trident Protect Connectorall versionscert_bundDEcpe:/a:netapp:trident:protect_connector
Oracle Linuxall versionscert_bundDEcpe:/o:oracle:linux:-
RESF Rocky Linuxall versionscert_bundDEcpe:/o:resf:rocky_linux:-
Red Hat Enterprise Linuxall versionscert_bundDEcpe:/o:redhat:enterprise_linux:-
Red Hat Enterprise Linux Advanced Cluster Management for Kubernetesall versionscert_bundDEcpe:/o:redhat:enterprise_linux:advanced_cluster_management_for_kubernetes
Red Hat Enterprise Linux Migration Toolkit for Applicationsall versionscert_bundDEcpe:/o:redhat:enterprise_linux:migration_toolkit_for_applications_6.2.0
Red Hat OpenShift Container Platformall versionscert_bundDEcpe:/a:redhat:openshift:container_platform
SUSE Linuxall versionscert_bundDEcpe:/o:suse:suse_linux:-
SUSE openSUSEall versionscert_bundDEcpe:/o:suse:opensuse:-
Ubuntu Linuxall versionscert_bundDEcpe:/o:canonical:ubuntu_linux:-
golang Go< 1.25.13cert_bundDE
golang Go< 1.26.6cert_bundDE
Go standard library net/http0 → 1.25.13enisa_euvdEU
Go standard library net/http1.26.0-0 → 1.26.6enisa_euvdEU
Go standard library net/http1.27.0-0 → 1.27.0-rc.3enisa_euvdEU
Bitnami golang< 1.25.13osvUSpkg:bitnami/golang
Bitnami golang1.26.0-0 → 1.26.6osvUSpkg:bitnami/golang
Bitnami golang1.27.0-0 → 1.27.0osvUSpkg:bitnami/golang

showing 20 of 23

advisories (4)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2026-2850Golang Go: Mehrere SchwachstellenDeutsch2026-08-13csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Golang Go ausnutzen, um einen Denial of Service zu verursachen, ein Cross Site Scripting durchzuführen, Sicherheitsmaßnahmen zu umgehen oder Daten zu manipulieren.
BIT-golang-2026-56853Apply ReadHeaderTimeout when doing unencrypted HTTP/2 check in net/http2026-08-19vendor · osvUS
When a server is configured to support unencrypted HTTP/2, it reads a few bytes from each new connection to see if they contain the HTTP/2 client preface. ReadHeaderTimeout is unexpectedly not being applied when doing this.
CERTFR-2026-AVI-1385Multiples vulnérabilités dans les produits VMwareFrançais2026-10-26vendor · certfrFR
GO-2026-6089Apply ReadHeaderTimeout when doing unencrypted HTTP/2 check in net/http2026-08-13vendor · osvUS
When a server is configured to support unencrypted HTTP/2, it reads a few bytes from each new connection to see if they contain the HTTP/2 client preface. ReadHeaderTimeout is unexpectedly not being applied when doing this.

also known as (5)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd osv cert_bund certfr NVD CVE.org MITRE

published 2026-08-13modified 2026-09-03

references (12)

External citations — patches, advisories, analysis.

scry

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