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9.8

Loki package can be blocked by crafted SSH responses

published 23 days ago
Summary

The Loki software that handles SSH connections can be tricked by a malicious server into filling its internal memory with unexpected messages. This can stop the program from reading further data, effectively hanging the connection. Update Loki to the latest version or apply the vendor’s patch to prevent this behavior.

What to do
  • Update cleanstart loki to version 3.7.1-r1.
Affected software
Ecosystem VendorProductAffected versions
CleanStart cleanstart loki < 3.7.1-r1
Fix: upgrade to 3.7.1-r1
Original advisory text
malicious SSH peer could send unsolicited global request responses to fill an internal buffer, blocking the connection's read loop
Security vulnerability affects the loki package. A malicious SSH peer could send unsolicited global request responses to fill an internal buffer, blocking the connection's read loop.
References
Fix within
Internet-facing 3 days
Internal 60 days
  • Not known to be exploited
  • Can be exploited automatically (estimated)
  • Gives an attacker full control (estimated)
Severity
9.8 Critical
Timeline
Published26 Sep 2026
Updated26 Sep 2026
First seen26 Sep 2026
Sources
CLEANSTART-2026-TA77263 · OSV
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