Bug 2520794 (CVE-2026-77639) - CVE-2026-77639 tor: Tor: Denial of Service via compression bomb bypass
Summary: CVE-2026-77639 tor: Tor: Denial of Service via compression bomb bypass
Keywords:
Status: NEW
Alias: CVE-2026-77639
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2521286 2521287
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-08-20 21:26 UTC by OSIDB Bzimport
Modified: 2026-08-22 11:47 UTC (History)
0 users

Fixed In Version:
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Description OSIDB Bzimport 2026-08-20 21:26:02 UTC 
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.
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