This page tracks the Debian fix status. The vulnerability itself is described on the main CVE page. View CVE-2026-55654 →
Categories
DEBIAN-CVE-2026-55654

A flaw was found in OpenSSH. This vulnerability, a heap out-of-bounds read, occurs during the cleanup of GSSAPI (Generic Security Service Application...

Original description

The description as published by the source.

A flaw was found in OpenSSH. This vulnerability, a heap out-of-bounds read, occurs during the cleanup of GSSAPI (Generic Security Service Application Programming Interface) indicators when a trailing NULL termination is missing in the auth-indicators array. A remote attacker, under specific configurations involving GSSAPI authentication and a Kerberos environment, could exploit this to cause the SSH authentication path to crash or abort. This leads to a denial of service (DoS), impacting the availability of the SSH service.

Source: OSV.dev (Open Source Vulnerabilities) OSV

Affected packages

Debian:13 openssh
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Debian:14 openssh
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:10.4p1-5"}]}]
Debian:14 openssh-gssapi
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

References

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