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CVE-2026-59842

libssh: libssh: information disclosure via short GSSAPI Curve25519 public key

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Severity

Low

Red Hat Product Security

3.7

CVSS 3.1

Review impact separately from score.

Published · July 21, 2026

Updated · August 19, 2026

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.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

Disable GSSAPIKeyExchange or remove gss-curve25519-sha256- from GSSAPIKexAlgorithms if appropriate.

CVSS / CWE

CVSS 3.1 · 3.7
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

CWE-125 · Out-of-bounds Read