CVE-2026-59842
Published: July 22, 2026Last modified: July 28, 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.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 3.7 |
| Attack Vector | NETWORK |
| Attack complexity | HIGH |
| Privileges required | NONE |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | LOW |
| Integrity impact | NONE |
| Availability impact | NONE |
| Vector | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N |
Notes
Introduced in libssh-0.12.0 according to https://www.libssh.org/security/advisories/CVE-2026-59842.txt
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | libssh | Not affected (0.10.4-r0) |
| 25 LTS | libssh | Not affected (0.11.1-r0) | |
| Stream | libssh | Fixed (0.12.1-r0) |