CVE-2026-77639

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CVSS 3.1

5.3 medium

EPSS

<1%p14

Published

Aug 20, 2026 (26d ago)

Modified

Sep 8, 2026

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.

Vendors: torproject
Products: tor
Weakness: CWE-420
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

NVD CVE.org GitHub PoCs EPSS (0.2%)

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