This page tracks the Debian fix status. The vulnerability itself is described on the main CVE page. View CVE-2026-55200 →

DEBIAN-CVE-2026-55200

libssh2 through 1.11.1, fixed in commit 7acf3df contains an out-of-bounds write vulnerability in ssh2_transport_read() that fails to enforce upper bou...

Original description

The description as published by the source.

libssh2 through 1.11.1, fixed in commit 7acf3df contains an out-of-bounds write vulnerability in ssh2_transport_read() that fails to enforce upper bounds on packet_length field. Remote attackers can send crafted SSH packets with excessively large packet_length values to corrupt heap memory and achieve remote code execution.

Source: OSV.dev (Open Source Vulnerabilities) OSV

Affected packages

Debian:13 libssh2

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.11.1-1+deb13u1"}]}]

Debian:14 libssh2

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.11.1-4"}]}]

References

advisory security-tracker.debian.org