CVE-2026-106584: CWE-193 Off-by-one Error in OpenBSD OpenSSH
Description
An off-by-one error (CWE-193) in ssh-keygen in OpenSSH versions before 10.6 causes certificates to have incorrect expiration times due to mishandling of Daylight Saving Time. This issue may have a slightly more severe impact on users in some Antarctic locations. The vulnerability has a low CVSS score of 2.5 and does not affect confidentiality or availability, only integrity to a limited extent.
CVSS v3.1
Score 2.5low
Affected software
OpenBSD
OpenSSH
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-106584 is an off-by-one error in the ssh-keygen utility of OpenSSH prior to version 10.6. This flaw causes certificate expiration times to be calculated incorrectly because Daylight Saving Time is mishandled. The impact is limited to the integrity of certificate expiration timestamps, with a slightly more pronounced effect for users in certain Antarctic regions due to their unique time zone considerations. No known exploits are reported in the wild, and the vulnerability requires local access with high attack complexity and user interaction.
Potential Impact
The vulnerability can cause certificates generated by ssh-keygen to have incorrect expiration times, potentially leading to premature or delayed certificate expiration. This affects the integrity of certificate validity periods but does not impact confidentiality or availability. The issue is more noticeable for users in specific Antarctic time zones. The overall severity is low.
Mitigation Recommendations
A fix is available in OpenSSH version 10.6 and later. Users should upgrade to OpenSSH 10.6 or newer to resolve this issue. No other mitigation is indicated.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mitre
- Date Reserved
- 2026-10-06T20:47:50.132Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ac562452cdf04f656de8cf6
Added to database: 10/06/2026, 21:04:05 UTC
Last enriched: 10/06/2026, 21:18:40 UTC
Last updated: 10/06/2026, 21:18:55 UTC
Views: 5
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