Low [CVE-2026-59842] information disclosure via short GSSAPI Curve25519 public key
This low-severity Red Hat Linux advisory covers CVE-2026-59842 affecting Red Hat Enterprise Linux 10, Red Hat Hardened Images, Red Hat package: libssh.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
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Summary
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. Red Hat severity: Low — CVSS 3.7 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N).
Weakness: CWE-125. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Hardened Images.
Red Hat lists Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9 as not affected. Red Hat fixing advisory: RHSA-2026:55855, RHSA-2026:42922.
Affected products named by the advisory: Red Hat package: libssh.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · high-confidence parse· fetched 8 days ago·verify at source
- libssh-0:0.12.0-3.el10_2
- libssh-main-0.12.1-4.hum1
- RHSA-2026:55855
- RHSA-2026:42922
Official advisory · high-confidence parse· fetched 8 days ago·verify at source
Mitigation checklist
- Disable GSSAPIKeyExchange or remove gss-curve25519-sha256- from GSSAPIKexAlgorithms if appropriate.
Official advisory · high-confidence parse· fetched 8 days ago·verify at source
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