Description
Tor before 0.2.3.23-rc allows remote attackers to cause a denial of service (assertion failure and daemon exit) via a renegotiation attempt that occurs after the initiation of the V3 link protocol.
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 | 0.2.3.23-rc-1 | — |
| Debian 13 | tor | 0.2.3.23-rc-1 | — |
| Debian 12 | tor | 0.2.3.23-rc-1 | — |
| Debian 6.0 | tor | 0.2.4.23-1~deb6u1 | DLA-17-1 |
Advisories 1
- DLA-17-1 tor - new upstream version Debian Security (DSA / DLA) · Mar 9, 2026