Description
A use-after-free issue was discovered in Tor 0.3.2.x before 0.3.2.10. It allows remote attackers to cause a denial of service (relay crash) because the KIST implementation allows a channel to be added more than once in the pending list.
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 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | tor | 0.3.2.10-1 | — |
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 12 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 | — |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
Exploit-DB 1
- Tor Browser < 0.3.2.10 - Use After Free (PoC) EDB-44994 · dos · Jul 9, 2018
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 3
- 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