CVE-2026-97031

highpriority · track · 0EPSS 0.005 · 44 %ileDEFRUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.52% (44th) EPSS

CVSS 7.5 · high

Is it mine?

13 products

Check your exposure

Who says so?

3 sources

osv · cert_bund · certfr

EPSS · scored 2026-10-28

Multiple ECH outer extension references are not permitted under RFC 9849; previously, a client could send a well-crafted packet that could trigger memory exhaustion in the server process by specifying multiple references. We now reject these as malformed and curb the memory amplification vector as a result.

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: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-405US

affected products (13)

Products and version ranges known to be affected.

Amazon Linux 2all versionscert_bundDEcpe:/o:amazon:linux_2:-
Microsoft Azure Linux azl3all versionscert_bundDEcpe:/o:microsoft:azure_linux:azl3
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:-
SUSE Linuxall versionscert_bundDEcpe:/o:suse:suse_linux:-
SUSE openSUSEall versionscert_bundDEcpe:/o:suse:opensuse:-
golang Go< 1.26.9cert_bundDE
golang Go< 1.27.2cert_bundDE
Bitnami golang< 1.26.9osvUSpkg:bitnami/golang
Bitnami golang1.27.0-0 → 1.27.2osvUSpkg:bitnami/golang
Go stdlib< 1.26.9osvUSpkg:golang/stdlib
Go stdlib1.27.0-0 → 1.27.2osvUSpkg:golang/stdlib

advisories (4)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2026-3841Golang Go: Mehrere SchwachstellenDeutsch2026-10-08csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in Golang Go ausnutzen, um einen Denial of Service Angriff durchzuführen, um Informationen offenzulegen, um Daten zu manipulieren und um Sicherheitsvorkehrungen zu umgehen.
BIT-golang-2026-97031Reject malformed ECH outer extension references in crypto/tls2026-10-16vendor · osvUS
Multiple ECH outer extension references are not permitted under RFC 9849; previously, a client could send a well-crafted packet that could trigger memory exhaustion in the server process by specifying multiple references. We now reject these as malformed and curb the memory amplification vector as a result.
CERTFR-2026-AVI-1385Multiples vulnérabilités dans les produits VMwareFrançais2026-10-26vendor · certfrFR
GO-2026-6607Reject malformed ECH outer extension references in crypto/tls2026-10-08vendor · osvUS
Multiple ECH outer extension references are not permitted under RFC 9849; previously, a client could send a well-crafted packet that could trigger memory exhaustion in the server process by specifying multiple references. We now reject these as malformed and curb the memory amplification vector as a result.

also known as (2)

Other names and identifiers for this entity.

BIT-golang-2026-97031osv
GO-2026-6607osv

sources

Which sources assert this record, and when.

osv cert_bund certfr NVD CVE.org MITRE

published 2026-10-08modified 2026-10-09

references (4) nvd

External citations — patches, advisories, analysis.

scry

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