tor: Tor before 0.4.9.9 was prone to a compression bomb bypass where an attacker could concatenate many gzip or zlib sub-s...
CVE-2026-77639 is fixed in tor on 1 platform, first by DEBIAN-CVE-2026-77639, released August 21, 2026. It is not reported as exploited. Patch Radar priority: Routine.
Tor before 0.4.9.9 was prone to a compression bomb bypass where an attacker could concatenate many gzip or zlib sub-streams, each just under the per-stream detection threshold, to avoid the compression bomb check entirely. This is TROVE-2026-022.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| tor · Debian 12.15 (bookworm) | 0.4.9.9-1 | DEBIAN-CVE-2026-77639 | Aug 21, 2026 |
| tor · Debian 13.5 (trixie) | 0.4.9.11-0+deb13u1 | DEBIAN-CVE-2026-77639 | Aug 21, 2026 |
| tor · Debian 14 | 0.4.9.9-1 | DEBIAN-CVE-2026-77639 | Aug 21, 2026 |
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