CVE-2026-56854

highpriority · track · 0OT risk · elevatedEPSS 0.004 · 38 %ileDEFRUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.44% (38th) EPSS

CVSS 7.5 · high

Is it mine?

5 products

Check your exposure

Who says so?

3 sources

cert_bund · osv · certfr

EPSS · scored 2026-10-28

The source-address critical option in the Permissions returned by an authentication callback was only enforced for the PublicKeyCallback and VerifiedPublicKeyCallback paths, extending the fix for CVE-2026-46595. Permissions returned by the PasswordCallback, KeyboardInteractiveCallback, NoClientAuthCallback, and GSSAPIWithMICConfig.AllowLogin callbacks were not validated against the client's remote address, so a source-address restriction set by those callbacks was silently ignored. The check is now applied to the Permissions returned by any authentication callback.

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:H/I:N/A:Nsecondaryexploitability 3.9 · impact 3.6

v3.16.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/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-863US

affected products (5)

Products and version ranges known to be affected.

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:-
Red Hat OpenShift≤ Builds <1.9.1cert_bundDE
Go golang.org/x/crypto< 0.55.0osvUSpkg:golang/golang.org/x/crypto

advisories (3)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2026-3487Red Hat OpenShift Builds: Schwachstelle ermöglicht Umgehen von SicherheitsvorkehrungenDeutsch2026-09-21csaf · cert_bundDE
Ein entfernter, authentisierter Angreifer kann eine Schwachstelle in Red Hat OpenShift Builds ausnutzen, um Sicherheitsvorkehrungen zu umgehen.
CERTFR-2026-AVI-1385Multiples vulnérabilités dans les produits VMwareFrançais2026-10-26vendor · certfrFR
GO-2026-6303Source-address critical option not enforced for non-public-key auth callbacks in golang.org/x/crypto/ssh2026-08-28vendor · osvUS
The source-address critical option in the Permissions returned by an authentication callback was only enforced for the PublicKeyCallback and VerifiedPublicKeyCallback paths, extending the fix for CVE-2026-46595. Permissions returned by the PasswordCallback, KeyboardInteractiveCallback, NoClientAuthCallback, and GSSAPIWithMICConfig.AllowLogin callbacks were not validated against the client's remote address, so a source-address restriction set by those callbacks was silently ignored. The check is now applied to the Permissions returned by any authentication callback.

sources

Which sources assert this record, and when.

cert_bund osv certfr NVD CVE.org MITRE

published 2026-08-28modified 2026-09-03

references (3) nvd

External citations — patches, advisories, analysis.

scry

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