Critical [CVE-2026-56854] Authentication bypass due to unenforced source-address restrictions
This critical-severity Red Hat Linux advisory covers CVE-2026-56854.
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Summary
A flaw was found in golang.org/x/crypto/ssh. The component failed to properly enforce source-address restrictions for several authentication methods, including password and keyboard-interactive callbacks.
This oversight could allow a remote attacker to bypass intended network-based access controls, potentially leading to unauthorized access to services utilizing the affected component. Red Hat severity: Critical — CVSS 9.1 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N).
Weakness: CWE-346.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · medium-confidence parse· fetched 48 minutes ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · medium-confidence parse· fetched 48 minutes ago·verify at source
Mitigation
The source record does not include mitigation steps. That is not a statement that no fix exists — read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 48 minutes ago·verify at source
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