CVE-2026-35386: CWE-696 Incorrect Behavior Order in OpenBSD OpenSSH
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. No official patch or remediation details are provided in the available data.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-35386) in OpenSSH prior to version 10.3 involves incorrect behavior order (CWE-696) that allows command execution through shell metacharacters embedded in a username passed on the command line. Successful exploitation depends on the presence of untrusted usernames and specific non-default configurations of the % character in ssh_config. The CVSS 3.1 base score is 3.6, reflecting low impact with local attack vector, high attack complexity, low privileges required, no user interaction, and limited confidentiality and integrity impact.
Potential Impact
The impact is limited to potential command execution under constrained conditions: the attacker must supply an untrusted username on the command line and the ssh client must be configured with non-default % expansions in ssh_config. The vulnerability could lead to limited confidentiality and integrity compromise but does not affect availability. There are no known exploits in the wild.
Mitigation Recommendations
Patch status is not yet confirmed — check the OpenBSD vendor advisory for current remediation guidance. Until an official fix is available, avoid using untrusted usernames on the command line and refrain from non-default % configurations in ssh_config that could trigger this behavior.
CVE-2026-35386: CWE-696 Incorrect Behavior Order in OpenBSD OpenSSH
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. No official patch or remediation details are provided in the available data.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-35386) in OpenSSH prior to version 10.3 involves incorrect behavior order (CWE-696) that allows command execution through shell metacharacters embedded in a username passed on the command line. Successful exploitation depends on the presence of untrusted usernames and specific non-default configurations of the % character in ssh_config. The CVSS 3.1 base score is 3.6, reflecting low impact with local attack vector, high attack complexity, low privileges required, no user interaction, and limited confidentiality and integrity impact.
Potential Impact
The impact is limited to potential command execution under constrained conditions: the attacker must supply an untrusted username on the command line and the ssh client must be configured with non-default % expansions in ssh_config. The vulnerability could lead to limited confidentiality and integrity compromise but does not affect availability. There are no known exploits in the wild.
Mitigation Recommendations
Patch status is not yet confirmed — check the OpenBSD vendor advisory for current remediation guidance. Until an official fix is available, avoid using untrusted usernames on the command line and refrain from non-default % configurations in ssh_config that could trigger this behavior.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mitre
- Date Reserved
- 2026-04-02T16:44:27.451Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 69cea282e6bfc5ba1ded3a57
Added to database: 4/2/2026, 5:08:18 PM
Last enriched: 4/9/2026, 10:51:32 PM
Last updated: 5/20/2026, 2:55:54 PM
Views: 78
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.