by Kastro
Paper/Archive/CVE-2026-77642

CVE-2026-77642

torproject Tor — 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 t…

EPSS 0.4%CVSS 9.3
critical.is priorityof 100
34
CVSS 9.3 (NVD)9.3 / 10 × 3027.9Not in CISA KEV+300.0EPSS percentile 28.9.289 × 205.8No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
Tor0.2.8.2-alpha – < 0.4.9.90.4.9.9CNA

Scores by source

NVD9.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:H
mitre (CNA)7.5CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:H
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: partial

References

refgitlab.torproject.org/tpo/core/tor/-/raw/tor-0.4.9.9/ChangeLog