Vulnerability in OpenBSD OpenSSH

[ Description ]Official description

In sshd and ssh in OpenSSH before 10.6, an LZ77 dictionary coder can be used even though this is contraindicated by the arXiv 2609.07709 "Crossing the Streams" findings.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• BSI CERT-Bund6 Oct 2026WID-SEC-2026-3785

  OpenSSH: Multiple vulnerabilities Translated from German

  Risk mediumCVE-2026-106583CVE-2026-106555CVE-2026-106584+8 more CVEs

[ References ]References

• arxiv.org/abs/2609.07709Third Party Advisory
• www.openssh.org/releasenotes.htmlRelease Notes