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VulnerabilityPublished

CVE-2026-35386: OpenBSD OpenSSH · Incorrect Behavior Order

Affects OpenBSD OpenSSHSource CVE Database V5

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Not known to be exploited · CVSS 3.6 Low : upgrade to 10.3 when convenient.

Data as of 29 Oct 2026, 19:04 UTC

CVSS 3.1 base score
3.6Low
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.3% chance of exploitation in 30 days – higher than 24% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 10.3
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 2 Apr 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.

What to do

Upgrade OpenSSH and the Debian debian/openssh package to 10.3.

Affected software

ProductAffectedFixed in
OpenBSDOpenSSHAffected
  • <10.3
Fixed in
  • 10.3
Debiandebian/opensshpkg:deb/debian/opensshOther threatsAffected
  • <10.3
Fixed in
  • 10.3

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

If you cannot patch yet, avoid using untrusted usernames on the command line and refrain from non-default % configurations in ssh_config that could trigger this behavior.

Description

CVE-2026-35386 is a low-severity vulnerability in OpenSSH versions before 10.3 where command execution can occur due to improper handling of shell metacharacters in usernames on the command line. Exploitation requires an untrusted username input and non-default ssh_config settings involving the % character. The vulnerability has a CVSS score of 3.6 and does not have known exploits in the wild.

References

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