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CVE-2026-77639

nvd nist
Published: Aug 20, 2026Modified: Sep 8, 2026

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5.3
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Exploitability: 3.9 / Impact: 1.4
Source: MITRE (Secondary)

Description

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.

Affected (1)

Products: Torproject: Tor
Torproject
1 product
Tor
Configuration A
1 vulnerable
Vulnerable SoftwareAffected Versions
Tor
Before 0.4.9.9

Related CWEs

CWE-420
Unprotected Alternate Channel
The product protects a primary channel, but it does not use the same level of protection for an alternate channel.

References (1)

Source: cve@mitre.org
Release NotesVendor Advisory

Timeline

No history available yet.