Description
Tor before 0.2.1.29 and 0.2.2.x before 0.2.2.21-alpha might allow remote attackers to cause a denial of service (assertion failure and daemon exit) via vectors related to malformed router caches and improper handling of integer values.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | tor | 0.2.1.29-1 | — |
| Debian 13 | tor | 0.2.1.29-1 | — |
| Debian 12 | tor | 0.2.1.29-1 | — |
| Debian 5.0 | tor | 0.2.1.29-1~lenny+1 | DSA-2148-1 |
Advisories 1
- DSA-2148-1 tor - several Debian Security (DSA / DLA) · Mar 9, 2026
References
- [or-announce] 20110117 Tor 0.2.1.29 is released (security patches) mailing-list
- https://gitweb.torproject.org/tor.git/blob/refs/heads/release-0.2.2:/ChangeLog
- https://trac.torproject.org/projects/tor/ticket/2352
- http://blog.torproject.org/blog/tor-02129-released-security-patches
- tor-routercache-dos(64864) vdb-entry
- 45953 vdb-entry