Description
An issue was discovered in Tor before 0.2.9.15, 0.3.1.x before 0.3.1.10, and 0.3.2.x before 0.3.2.10. The directory-authority protocol-list subprotocol implementation allows remote attackers to cause a denial of service (NULL pointer dereference and directory-authority crash) via a misformatted relay descriptor that is mishandled during voting.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | Tor | Tor | — |
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 | 0.3.2.10-1 | — |
| Debian 13 | tor | 0.3.2.10-1 | — |
| Debian 12 | tor | 0.3.2.10-1 | — |
| Debian 9 | tor | 0.2.9.15-1 | DSA-4183-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | tor | 0.2.9.14-1ubuntu1~16.04.3 | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SUSE Package Hub 12 | tor | 0.3.2.10-14.1 | openSUSE-SU-2018:0620-1, openSUSE-SU-2018:0614-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | tor | 0.4.6.7-2.2 | openSUSE-SU-2024:11469-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | tor | 0.3.2.10-r0 | — |
| Alpine v3.23 | tor | 0.3.2.10-r0 | — |
| Alpine v3.22 | tor | 0.3.2.10-r0 | — |
| Alpine v3.21 | tor | 0.3.2.10-r0 | — |
| Alpine v3.20 | tor | 0.3.2.10-r0 | — |
Show 13 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | tor | 0.3.2.10-r0 | — |
| Alpine v3.18 | tor | 0.3.2.10-r0 | — |
| Alpine v3.17 | tor | 0.3.2.10-r0 | — |
| Alpine v3.16 | tor | 0.3.2.10-r0 | — |
| Alpine v3.15 | tor | 0.3.2.10-r0 | — |
| Alpine v3.14 | tor | 0.3.2.10-r0 | — |
| Alpine v3.13 | tor | 0.3.2.10-r0 | — |
| Alpine v3.12 | tor | 0.3.2.10-r0 | — |
| Alpine v3.11 | tor | 0.3.2.10-r0 | — |
| Alpine v3.10 | tor | 0.3.2.10-r0 | — |
| Alpine v3.9 | tor | 0.3.2.10-r0 | — |
| Alpine v3.8 | tor | 0.3.2.10-r0 | — |
| Alpine v3.7 | tor | 0.3.1.10-r0 | — |
Advisories 4
- DSA-4183-1 tor - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2018:0620-1 Security update for tor SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:11469-1 tor-0.4.6.7-2.2 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2018:0614-1 Security update for tor SUSE / openSUSE Security Updates · Feb 4, 2026