CVE-2026-77587

EUVD-2026-63593
Tor before 0.4.9.11 is prone to a use-after-free (and potential double free) of a conflux object when a recovery leg revives a conflux set whose last linked leg has already been closed. A malicious exit node could use this to crash a client. This is TROVE-2026-026.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
5.9 MEDIUM
NETWORK
HIGH
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 32.44%
Affected Products (NVD)
VendorProductVersion
torprojecttor
𝑥
< 0.4.9.11
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
tor
bookworm
0.4.9.11-0+deb12u1
fixed
bookworm (security)
0.4.9.11-0+deb12u1
fixed
forky
0.4.9.12-4
fixed
sid
0.4.9.13-1
fixed
trixie
0.4.9.11-0+deb13u1
fixed
trixie (security)
0.4.9.13-0+deb13u1
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
tor
bionic
needs-triage
focal
needs-triage
jammy
needs-triage
noble
needs-triage
resolute
needs-triage
trusty
needs-triage
xenial
needs-triage
Common Weakness Enumeration
References
https://gitlab.torproject.org/tpo/core/tor/-/raw/tor-0.4.9.11/ChangeLog