Description
A flaw was found in libssh. Incorrect AES-GCM finalization checks in builds using the OpenSSL backend can effectively remove integrity protection, allowing an in-path attacker to modify plaintext on the wire without detection.
Affected products
libssh: libssh; redhat: hardened images; redhat: enterprise linux
References6
- access.redhat.com/errata/RHSA-2026:42922 Third Party Advisory
- access.redhat.com/errata/RHSA-2026:55855 Third Party Advisory
- access.redhat.com/errata/RHSA-2026:62217 Third Party Advisory
- access.redhat.com/errata/RHSA-2026:62218 Third Party Advisory
- access.redhat.com/security/cve/CVE-2026-59847 Third Party Advisory
- bugzilla.redhat.com/show_bug.cgi?id=2498180 Issue TrackingThird Party Advisory
Metrics
- CVSS 3.1
-
7.5
HIGH
Score source: NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N - EPSS — exploit probability
- 0% percentile: 27 · as of 14 November 2026
- CWE
- CWE-253CWE-1310
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.