🛡️ CVE-2026-59999 — openssh

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is high, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity high, availability none.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

• Attack vector: Network — reachable from anywhere that can route to the service.
• Attack complexity: High — the attacker first has to win a race, learn a secret or otherwise prepare the target.
• Privileges required: None — an unauthenticated stranger can try it.
• User interaction: None — nobody has to be tricked into anything.
• Scope: Unchanged — the damage stays inside the vulnerable component.
• Confidentiality impact: None.
• Integrity impact: High — total loss, or loss the attacker controls.
• Availability impact: None.

Weakness class

CVE-2026-59999 is classified as CWE-348: Use of Less Trusted Source. The product has two different sources of the same data or information, but it uses the source that has less support for verification, is less trusted, or is less resistant to attack.

Affected software

CVE-2026-59999 is recorded against 1 package.

• openssh (fixed in 10.4)

Timeline and source

Published on 8 July 2026 and last revised on 9 July 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

marc.info
www.openssh.org
www.openwall.com

Other advisories for this package

openssh has other advisories on record. If you are patching this one, these are worth checking on the same host:

• ROOT-OS-DEBIAN-12-CVE-2026-60002 (9.5 Critical, published 20 Aug 2026)
• ROOT-OS-DEBIAN-12-CVE-2023-51767 (8.0 High, published 20 Aug 2026)
• ROOT-OS-DEBIAN-12-CVE-2018-15919 (2.0 Low, published 20 Aug 2026)
• ROOT-OS-DEBIAN-13-CVE-2026-60002 (9.5 Critical, published 19 Aug 2026)
• RHSA-2026:47756 (published 30 Jul 2026)

Same weakness in other software

These advisories are the same class of weakness (CWE-348: Use of Less Trusted Source) in other software:

• CVE-2026-48772 (9.5 Critical, published 17 Aug 2026)
• CVE-2026-63220 (4.8 Medium, published 7 Aug 2026)
• CVE-2026-25552 (3.7 Low, published 31 Jul 2026)
• CVE-2026-50243 (3.7 Low, published 22 Jul 2026)
• CVE-2026-59897 (4.8 Medium, published 21 Jul 2026)
• CVE-2026-64619 (7.5 High, published 20 Jul 2026)
• CVE-2026-63770 (7.5 High, published 20 Jul 2026)
• CVE-2026-58122 (9.1 Critical, published 9 Jul 2026)

Details

Affected Packages

References