VulnerabilityAnalyzed
CVE-2026-59847
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.
HIGH 7.5EPSS 0.33%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.33%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- EPSS
- 0.33% probability · 26th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-253, CWE-1310
- Affected
- libssh/libssh · redhat/hardened images · redhat/enterprise linux
- Source
- secalert@redhat.com
References
- https://access.redhat.com/errata/RHSA-2026:42922Third Party Advisory
- https://access.redhat.com/errata/RHSA-2026:55855Third Party Advisory
- https://access.redhat.com/errata/RHSA-2026:62217Third Party Advisory
- https://access.redhat.com/errata/RHSA-2026:62218Third Party Advisory
- https://access.redhat.com/security/cve/CVE-2026-59847Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2498180Issue Tracking, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.