🚨 CVE-2026-87724
Tor before 0.4.9.12 interprets the CC_RESPONSE extension even when CC_REQUEST was not sent, which allows remote attackers to cause a denial of service (crash) because of corrupted congestion-control state. This is TROVE-2026-032.
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GitLab
Reject CC_RESPONSE extension if we did not send CC_REQUEST. (10d4b8ff) · Commits · torproject / tor · GitLab
Failing to do so can put a circuit hop into an invalid state. Fixes #41345; Fixes TROVE-2026-032.
September 9, 2026 41
