Description
Use-after-free vulnerability in dns.c in Tor before 0.2.2.38 might allow remote attackers to cause a denial of service (daemon crash) via vectors related to failed DNS requests.
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 | 0.2.3.20-rc-1 | — |
| Debian 13 | tor | 0.2.3.20-rc-1 | — |
| Debian 12 | tor | 0.2.3.20-rc-1 | — |
| Debian 6.0 | tor | 0.2.4.23-1~deb6u1 | DLA-17-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | tor | 0.2.8.11-1.1 | openSUSE-SU-2024:10423-1 |
Advisories 2
- DLA-17-1 tor - new upstream version Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2024:10423-1 tor-0.2.8.11-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
References
- GLSA-201301-03 vendor-advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=849949
- [tor-announce] 20120819 Tor 0.2.2.38 is released mailing-list
- https://gitweb.torproject.org/tor.git/commit/62637fa22405278758febb1743da9af562524d4c
- [oss-security] 20120821 Re: CVE Request -- Tor 0.2.2.38: Three issues mailing-list
- openSUSE-SU-2012:1068 vendor-advisory
- https://trac.torproject.org/projects/tor/ticket/6480
- FEDORA-2012-14638 vendor-advisory