CVE-2026-77642

CriticalCVSS 9.3/10Last modified Oct 18, 2026

Description

tor before 0.4.9.9 was prone to an out-of-bounds write when parsing a consensus or detached signature with unexpected signature digest type. Impact is minor for most Tor roles, but potentially major for directory authorities. This is TROVE-2026-019.

Metrics

CVSS 3.1 9.3/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:H

Weakness enumeration

CWE-787

Affected software

Vendor	Product	Versions
torproject	Tor	>= 0.2.8.2-alpha, < 0.4.9.9

References

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

Timeline

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

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