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.
Affected products
torproject: tor
References1
- gitlab.torproject.org/tpo/core/tor/-/raw/tor-0.4.9.9/ChangeLog Permissions RequiredRelease NotesVendor Advisory
Metrics
- CVSS 3.1
-
9.3
CRITICAL
Score source: NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:H - EPSS — exploit probability
- 0% percentile: 29 · as of 10 November 2026
- CWE
- CWE-787
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.