What’s Vulnerable › Vulnerabilities
CVE-2026-59842: Libssh: libssh: information disclosure via short gssapi curve25519 public key
- Severity: medium (CVSS 5.3 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.5% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-07-21 · updated 2026-09-22
- Weakness: CWE-125
Description
A flaw was found in libssh. During server-side GSSAPI key exchange, a client-supplied Curve25519 public key shorter than the expected length is copied without proper length validation, leading to an out-of-bounds heap read. This could allow a remote unauthenticated attacker to disclose small amounts of server memory.
Affected products
- libssh: 0.12.0
- Red Hat Enterprise Linux: 10.0, 10.2
- RedHat Enterprise Linux For Els: 10.2
- RedHat Enterprise Linux For Eus: 10.2
- RedHat Enterprise Linux For Ibm Z Systems: 10.0, 10.2
- RedHat Enterprise Linux For Ibm Z Systems Els: 10.2
- RedHat Enterprise Linux For Ibm Z Systems Eus: 10.2
- RedHat Enterprise Linux For Power Little Endian: 10.0, 10.2
- RedHat Enterprise Linux For Power Little Endian Els: 10.2
- RedHat Enterprise Linux For Power Little Endian Eus: 10.2
- RedHat Hardened Images: all versions
References
- https://access.redhat.com/errata/RHSA-2026:42922
- https://access.redhat.com/errata/RHSA-2026:55855
- https://access.redhat.com/security/cve/CVE-2026-59842
- https://bugzilla.redhat.com/show_bug.cgi?id=2498168
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