CVE-2026-106582: CWE-514 Covert Channel in OpenBSD OpenSSH
Description
CVE-2026-106582 is a low-severity vulnerability in OpenSSH versions before 10.6 where the use of an LZ77 dictionary coder creates a covert channel, contrary to findings in the research paper arXiv 2609.07709 "Crossing the Streams." This vulnerability affects OpenSSH's sshd and ssh components.
CVSS v3.1
Score 3.7low
Affected software
OpenBSD
OpenSSH
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves the use of an LZ77 dictionary coder in OpenSSH versions prior to 10.6, which can be exploited as a covert channel. The issue is identified as CWE-514, indicating the presence of a covert channel that can be used to leak information. The vulnerability is based on the fact that the LZ77 coder usage is contraindicated by the referenced research paper, suggesting it can be abused for covert communication.
Potential Impact
The impact is limited to a low-severity confidentiality loss, as indicated by the CVSS score of 3.7 with vector AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N. There is no impact on integrity or availability. No known exploits are reported in the wild.
Mitigation Recommendations
No vendor advisory or patch information is provided. Patch status is not yet confirmed — check the OpenBSD or OpenSSH vendor advisories for current remediation guidance. Users should plan to upgrade to OpenSSH 10.6 or later once a fix is available.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mitre
- Date Reserved
- 2026-10-06T20:35:32.203Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ac55ec42cdf04f656dd7fcf
Added to database: 10/06/2026, 20:49:08 UTC
Last enriched: 10/06/2026, 21:03:40 UTC
Last updated: 10/06/2026, 21:08:12 UTC
Views: 4
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