# CVE-2018-0491: tor: A use-after-free issue was discovered in Tor 0.3.2.x before 0.3.2.10

CVE-2018-0491 is fixed in 2 products on 1 platform, first by tor 0.3.2.10-1, released March 5, 2018. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2018-0491
- Priority: Routine
- CVSS: n/a (Medium)
- EPSS: 0.1479
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Mar 5, 2018

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | tor Ubuntu 18.04.6 LTS (bionic) | 0.3.2.10-1 | [tor 0.3.2.10-1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-tor-0.3.2.10-1.md) | Mar 5, 2018 |
| Linux | tor-geoipdb Ubuntu 18.04.6 LTS (bionic) | 0.3.2.10-1 | [tor-geoipdb 0.3.2.10-1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-tor-geoipdb-0.3.2.10-1.md) | Mar 5, 2018 |

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Data as of 2026-11-07T12:40:37Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo