CVE-2025-8114: Libssh: null pointer dereference in libssh kex session id calculation

Severity: medium (CVSS 4.7 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-07-24 · updated 2026-09-01
Weakness: CWE-476

Description

A flaw was found in libssh, a library that implements the SSH protocol. When calculating the session ID during the key exchange (KEX) process, an allocation failure in cryptographic functions may lead to a NULL pointer dereference. This issue can cause the client or server to crash.

Affected products

libssh: through 0.11.2

References

https://access.redhat.com/errata/RHSA-2026:18683
https://access.redhat.com/security/cve/CVE-2025-8114
https://bugzilla.redhat.com/show_bug.cgi?id=2383220
https://git.libssh.org/projects/libssh.git/commit/?id=53ac23ded4cb2c5463f6c4cd1525331bd578812d
https://git.libssh.org/projects/libssh.git/commit/?id=65f363c9
https://www.libssh.org/security/advisories/CVE-2025-8114.txt

Get alerted when CVE-2025-8114 or the next vulnerability affects your stack