CVE-2026-59847

Libssh: libssh: integrity downgrade via openssl aes-gcm tag verification

HIGH
7.5
CVSS Score
Published: July 21, 2026 at 01:18 PM UTC
Updated: September 4, 2026 at 07:36 PM UTC
3 products affected across 2 vendorsEnterprise LinuxHardened ImagesLibssh

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Severity
HIGH7.5
Exploit prediction
EPSS 0.3%
SSVC
No known 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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

0.9.0 ≤ v < 0.11.50.12.0
Affected range stops below 0.11.5, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 0:0.10.4-19.el9_8 (unaffected)
Vendor states this is fixed in 0:0.12.0-3.el10_2 (unaffected)
Vendor states this is fixed in 0:0.9.6-17.el8_10 (unaffected)
Vendor states this is fixed in 0.12.1-4.hum1 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

References (6)

VDB Entryx_refsource_REDHATThird Party Advisory
Source: cverecord
https://access.redhat.com/security/cve/CVE-2026-59847
Issue Trackingx_refsource_REDHATThird Party Advisory
Source: cverecord
https://bugzilla.redhat.com/show_bug.cgi?id=2498180
Vendor Advisoryx_refsource_REDHATThird Party Advisory
Source: cverecord
https://access.redhat.com/errata/RHSA-2026:42922
Vendor Advisoryx_refsource_REDHATThird Party Advisory
Source: cverecord
https://access.redhat.com/errata/RHSA-2026:55855
Vendor Advisoryx_refsource_REDHATThird Party Advisory
https://access.redhat.com/errata/RHSA-2026:62218
Vendor Advisoryx_refsource_REDHATThird Party Advisory
Source: cverecord
https://access.redhat.com/errata/RHSA-2026:62217

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-1310CWE-253

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