CVE-2026-77639

MediumCVSS 5.3/10Last modified Oct 18, 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.

Metrics

CVSS 3.1 5.3/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Weakness enumeration

CWE-420

Affected software

Vendor	Product	Versions
torproject	Tor	>= 0.3.1.1-alpha, < 0.4.9.9

References

https://gitlab.torproject.org/tpo/core/tor/-/raw/tor-0.4.9.9/ChangeLogRelease Notes, Vendor Advisory

Timeline

Published: Aug 20, 2026
Last modified: Oct 18, 2026
NVD status: Analyzed

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