High severity · published Jul 21, 2026
CVE-2026-59847
Libssh: libssh: integrity downgrade via openssl aes-gcm tag verification
7.5
CVSS
0.3%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 26% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RH
Red Hat Enterprise Linux 10 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Enterprise Linux 8 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Enterprise Linux 9 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Hardened Images · Red Hat
All versions, or not specified · source: vendor
EL
Enterprise Linux · Redhat
8.0; 9.0; 10.0 · source: NVD
HI
Hardened Images · Redhat
All versions, or not specified · source: NVD
LI
Libssh · Libssh
0.9.0 before 0.11.5; 0.12.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-59847
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-59847
Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:42922
Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:55855
Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:62217
Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:62218
Third Party Advisory
https://access.redhat.com/security/cve/CVE-2026-59847
Issue Tracking
https://bugzilla.redhat.com/show_bug.cgi?id=2498180
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