CVE-2026-35387: CWE-670 Always-Incorrect Control Flow Implementation in OpenBSD OpenSSH
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.
AI Analysis
Technical Summary
This vulnerability (CWE-670) in OpenSSH prior to version 10.3 involves an always-incorrect control flow implementation related to ECDSA algorithm selection. When any ECDSA algorithm is specified in PubkeyAcceptedAlgorithms or HostbasedAcceptedAlgorithms, OpenSSH incorrectly treats this as permitting all ECDSA algorithms, potentially leading to unintended algorithm acceptance. The CVSS 3.1 base score is 3.1, indicating low severity, with network attack vector, high attack complexity, low privileges required, no user interaction, and limited impact on integrity only.
Potential Impact
The impact is limited to a potential integrity issue due to unintended acceptance of all ECDSA algorithms when only one is specified. There is no confidentiality or availability impact reported. No known exploits are currently in the wild.
Mitigation Recommendations
No official patch or vendor advisory is provided in the data. Patch status is not yet confirmed — check the OpenBSD or OpenSSH vendor advisories for current remediation guidance. Until a fix is available, administrators should be cautious when configuring ECDSA algorithms and monitor vendor communications for updates.
CVE-2026-35387: CWE-670 Always-Incorrect Control Flow Implementation in OpenBSD OpenSSH
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.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CWE-670) in OpenSSH prior to version 10.3 involves an always-incorrect control flow implementation related to ECDSA algorithm selection. When any ECDSA algorithm is specified in PubkeyAcceptedAlgorithms or HostbasedAcceptedAlgorithms, OpenSSH incorrectly treats this as permitting all ECDSA algorithms, potentially leading to unintended algorithm acceptance. The CVSS 3.1 base score is 3.1, indicating low severity, with network attack vector, high attack complexity, low privileges required, no user interaction, and limited impact on integrity only.
Potential Impact
The impact is limited to a potential integrity issue due to unintended acceptance of all ECDSA algorithms when only one is specified. There is no confidentiality or availability impact reported. No known exploits are currently in the wild.
Mitigation Recommendations
No official patch or vendor advisory is provided in the data. Patch status is not yet confirmed — check the OpenBSD or OpenSSH vendor advisories for current remediation guidance. Until a fix is available, administrators should be cautious when configuring ECDSA algorithms and monitor vendor communications for updates.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mitre
- Date Reserved
- 2026-04-02T16:52:52.884Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 69cea282e6bfc5ba1ded3a5c
Added to database: 4/2/2026, 5:08:18 PM
Last enriched: 4/9/2026, 10:49:09 PM
Last updated: 5/20/2026, 9:41:44 PM
Views: 42
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