CVE-2026-35387 Security feature bypass in OpenSSH

Low 3.1 Published 2 Apr 2026 Updated 3 Apr 2026

OpenSSH misinterprets ECDSA algorithm listings, allowing unintended algorithms if specific configuration options are set.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2026-35387?

CVE-2026-35387 is a low-severity vulnerability in OpenSSH, published on 2 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

OpenSSH before 10.3 can use unintended ECDSA algorithms. Listing of any ECDSA algorithm in PubkeyAcceptedAlgorithms or HostbasedAcceptedAlgorithms is misinterpreted to mean all ECDSA algorithms.

Weakness: CWE-670

Which versions are affected by CVE-2026-35387?

It affects 1 product.

Products include OpenSSH.

How do I fix CVE-2026-35387?

Upgrade to a fixed version.

Is CVE-2026-35387 being exploited?

There is no known exploitation of CVE-2026-35387 in the wild and no public exploit code.

All OpenSSH vulnerabilities

Sources

Also known as AZL-81794, BELL-CVE-2026-35387, DEBIAN-CVE-2026-35387, ECHO-3b5a-4980-c0ad, GHSA-hpxh-vgmp-3qp6, JLSEC-2026-76 and 1 more.