CVE-2026-77640

5.3 Moyenne

Publiée le 20/08/2026 à 23:17 · Modifiée le 18/10/2026 à 22:10 · Analysée par le NVD · Source : cve@mitre.org

Description

tor before 0.4.9.9 was prone to an infinite loop when decompressing a truncated zlib/gzip stream with done=1. A truncated stream never reaches Z_STREAM_END, causing zlib to return Z_BUF_ERROR with no input remaining, which buf_add_compress() mistook for a full output buffer and retried forever. Fixed by returning TOR_COMPRESS_ERROR in that case so the caller can abort cleanly. This is TROVE-2026-021.

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Produits concernés

torproject Tor

Scores CVSS

Version	Score	Source	Vecteur
3.1	3.7 Faible	cve@mitre.org	`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L`
3.1	5.3 Moyenne	nvd@nist.gov (NVD)	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L`

Faiblesses (CWE)

CWE-1284

Références

https://gitlab.torproject.org/tpo/core/tor/-/raw/tor-0.4.9.9/ChangeLog Permissions RequiredRelease NotesVendor Advisory

Ailleurs

NVD
CVE.org
CIRCL Vulnerability-Lookup
CERT-FR
GitHub Advisories