| Name | CVE-2026-87724 |
| Description | Tor before 0.4.9.12 interprets the CC_RESPONSE extension even when CC_REQUEST was not sent, which allows remote attackers to cause a denial of service (crash) because of corrupted congestion-control state. This is TROVE-2026-032. |
| 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-6500-1 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| tor (PTS) | bookworm, bookworm (security) | 0.4.9.11-0+deb12u1 | vulnerable |
| trixie | 0.4.9.11-0+deb13u1 | vulnerable | |
| trixie (security) | 0.4.9.12-0+deb13u2 | fixed | |
| forky | 0.4.9.12-4 | fixed | |
| sid | 0.4.9.13-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| tor | source | trixie | 0.4.9.12-0+deb13u2 | DSA-6500-1 | ||
| tor | source | (unstable) | 0.4.9.12-2 |
Fixed by: https://gitlab.com/torproject/tor/-/commit/10d4b8ffefa7c00aab2b631ed7e7f15e42cd012d (tor-0.4.9.12)
aka TROVE-2026-032
https://gitlab.torproject.org/tpo/core/tor/-/work_items/41345
https://gitlab.torproject.org/tpo/core/tor/-/raw/release-0.4.9/ChangeLog