tor: Tor before 0.4.9.10 did not reject a CONFLUX_LINK cell that arrives on a circuit which already has attached streams
CVE-2026-77584 is fixed in tor on 1 platform, first by DEBIAN-CVE-2026-77584, released August 21, 2026. It is not reported as exploited. Patch Radar priority: High.
Tor before 0.4.9.10 did not reject a CONFLUX_LINK cell that arrives on a circuit which already has attached streams. A malicious client could send a RELAY_COMMAND_BEGIN before the CONFLUX_LINK on the same circuit, attaching an exit stream that would later end up orphan leaving a dangling circuit back-pointer and a use-after-free (UAF) when the circuit is freed. This is TROVE-2026-025.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| tor · Debian 12.15 (bookworm) | 0.4.9.11-0+deb12u1 | DEBIAN-CVE-2026-77584 | Aug 21, 2026 |
| tor · Debian 13.5 (trixie) | 0.4.9.11-0+deb13u1 | DEBIAN-CVE-2026-77584 | Aug 21, 2026 |
| tor · Debian 14 | 0.4.9.11-1 | DEBIAN-CVE-2026-77584 | Aug 21, 2026 |
| tor · opensuse-leap 16.0 | 0.4.9.11-bp160.1.1 | OPENSUSE-SU-2026:21660-1 | Aug 25, 2026 |
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