python3-tornado: Tornado before 6.5.9 contains a path traversal vulnerability in StaticFileHandler that follows symbolic links inside...
CVE-2026-103263 is fixed in 2 products on 1 platform, first by python3-tornado 6.5.4-0.1ubuntu0.2, released October 1, 2026. It is not reported as exploited. Patch Radar priority: Routine.
Tornado before 6.5.9 contains a path traversal vulnerability in StaticFileHandler that follows symbolic links inside the static root without confirming the resolved target stays within it. When a symlink pointing outside the static directory exists inside it, unauthenticated attackers can request it to read files such as configuration files, private keys, and application secrets accessible to the process user.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| python-tornado · Ubuntu 18.04.6 LTS (bionic) | 4.5.3-1ubuntu0.2+esm4 | python-tornado 4.5.3-1ubuntu0.2+esm4 | Oct 24, 2026 |
| python3-tornado · Ubuntu 18.04.6 LTS (bionic) | 4.5.3-1ubuntu0.2+esm4 | python3-tornado 4.5.3-1ubuntu0.2+esm4 | Oct 24, 2026 |
| python3-tornado · Ubuntu 22.04.1 LTS (jammy) | 6.1.0-3ubuntu0.1~esm6 | python3-tornado 6.1.0-3ubuntu0.1~esm6 | Oct 24, 2026 |
| python3-tornado · Ubuntu 24.04.5 LTS (noble) | 6.4.0-1ubuntu0.6 | python3-tornado 6.4.0-1ubuntu0.6 | Oct 24, 2026 |
| python3-tornado · Ubuntu 26.04.1 LTS (resolute) | 6.5.4-0.1ubuntu0.2 | python3-tornado 6.5.4-0.1ubuntu0.2 | Oct 1, 2026 |
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