CVE-2026-77642

Out‑Of‑Bounds Write During Consensus or Detached Signature Parsing in Tor

Published Aug 20, 2026 CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Title Out‑Of‑Bounds Write During Consensus or Detached Signature Parsing in Tor
Type Values Removed Values Added
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.
First Time appeared Torproject
Torproject tor
Weaknesses CWE-787
CPEs cpe:2.3:a:torproject:tor:*:*:*:*:*:*:*:*
Vendors & Products Torproject
Torproject tor
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
mitre
Published
Updated
Aug 27, 2026, 4:07 PM
Reserved
Aug 20, 2026, 9:15 PM
Status
Analyzed
Published
Aug 20, 2026, 10:18 PM
Modified
Oct 18, 2026, 8:10 PM