| Name | CVE-2026-77638 |
| Description | Tor before 0.4.9.11 is prone to a race condition where in just the right circumstances a rendezvous point could man-in-the-middle (impersonate) the onion service that the client was trying to reach. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DSA-6372-1 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| tor (PTS) | bullseye (security), bullseye | 0.4.5.16-1 | vulnerable |
| bookworm, bookworm (security) | 0.4.9.11-0+deb12u1 | vulnerable |
| trixie (security), trixie | 0.4.9.11-0+deb13u1 | fixed |
| forky, sid | 0.4.9.11-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| tor | source | bullseye | (unfixed) | end-of-life | | |
| tor | source | trixie | 0.4.9.11-0+deb13u1 | | DSA-6372-1 | |
| tor | source | (unstable) | 0.4.9.11-1 | | | |
Notes
[bullseye] - tor <end-of-life> (see DSA 5562)
https://gitlab.torproject.org/tpo/core/tor/-/work_items/41297