p PatchFirst

CVE-2026-103263

CVE-2026-103263 · Tornado before 6.5.9 StaticFileHandler Path Traversal via Symlink

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 8.2 · High · EPSS 0.5% · Fix available

Published
Updated

Stack: system · python

Affected products and versions

  • tornado

    Versions
    • ≥ 0, < 6.5.9: Affected (semver)
    • 6.5.9: Not affected (semver)

    Update to 6.5.9

  • python-tornado Debian:12

    Versions
    • 6.2.0-3
    • 6.2.0-3+deb12u1
    • 6.2.0-3+deb12u2
    • 6.2.0-3+deb12u3
    • 6.2.0-3+deb12u4
    • 6.3.2-1
    • 6.4.0-1
    • 6.4.0-2
    • 6.4.1-1
    • 6.4.1-2
    • 6.4.1-3
    • 6.4.2-1
    • 6.4.2-2
    • 6.4.2-3
    • 6.5.2-1
    • 6.5.2-2
    • 6.5.2-3
    • 6.5.4-0.1
    • 6.5.4-1
    • 6.5.5-1
    • 6.5.5-2
    • 6.5.5-3
    • 6.5.5-4
    • 6.5.5-5
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-tornado Debian:13

    Versions
    • 6.4.2-3
    • 6.4.2-3+deb13u1
    • 6.4.2-3+deb13u2
    • 6.5.2-1
    • 6.5.2-2
    • 6.5.2-3
    • 6.5.4-0.1
    • 6.5.4-1
    • 6.5.5-1
    • 6.5.5-2
    • 6.5.5-3
    • 6.5.5-4
    • 6.5.5-5
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-tornado Debian:14

    Versions
    • 6.4.2-3
    • 6.5.2-1
    • 6.5.2-2
    • 6.5.2-3
    • 6.5.4-0.1
    • 6.5.4-1
    • 6.5.5-1
    • 6.5.5-2
    • 6.5.5-3
    • 6.5.5-4
    • 6.5.5-5
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • tornado PyPI

    Versions
    • 0.2
    • 1.0
    • 1.1
    • 1.1.1
    • 1.2
    • 1.2.1
    • 2.0
    • 2.1
    • 2.1.1
    • 2.2
    • 2.2.1
    • 2.3
    • 2.4
    • 2.4.1
    • 3.0
    • 3.0.1
    • 3.0.2
    • 3.1
    • 3.1.1
    • 3.2
    • 3.2.1
    • 3.2.2
    • 4.0
    • 4.0.1
    • 4.0.2
    • 4.1
    • 4.1b2
    • 4.2
    • 4.2.1
    • 4.2b1
    • 4.3
    • 4.3b1
    • 4.3b2
    • 4.4
    • 4.4.1
    • 4.4.2
    • 4.4.3
    • 4.4b1
    • 4.5
    • 4.5.1
    • 4.5.2
    • 4.5.3
    • 4.5b1
    • 4.5b2
    • 5.0
    • 5.0.1
    • 5.0.2
    • 5.0a1
    • 5.0b1
    • 5.1
    • 5.1.1
    • 5.1b1
    • 6.0
    • 6.0.1
    • 6.0.2
    • 6.0.3
    • 6.0.4
    • 6.0a1
    • 6.0b1
    • 6.1
    • 6.1b1
    • 6.1b2
    • 6.2
    • 6.2b1
    • 6.2b2
    • 6.3
    • 6.3.1
    • 6.3.2
    • 6.3.3
    • 6.3b1
    • 6.4
    • 6.4.1
    • 6.4.2
    • 6.4b1
    • 6.5
    • 6.5.1
    • 6.5.2
    • 6.5.3
    • 6.5.4
    • 6.5.5
    • 6.5.6
    • 6.5.7
    • 6.5.8
    • 6.5b1
    Affected ranges
    • ECOSYSTEM: < 6.5.9

    Update to 6.5.9

  • python-tornado Ubuntu:Pro:16.04:LTS

    Versions
    • 4.2.1-1ubuntu2
    • 4.2.1-1ubuntu3
    • 4.2.1-1ubuntu3.1
    • 4.2.1-1ubuntu3.1+esm1
    • 4.2.1-1ubuntu3.1+esm2
    • 4.2.1-1ubuntu3.1+esm3
    Affected ranges
    • ECOSYSTEM: < 4.2.1-1ubuntu3.1+esm4

    Update to 4.2.1-1ubuntu3.1+esm4

  • python-tornado Ubuntu:Pro:18.04:LTS

    Versions
    • 4.5.1-2.1~build2
    • 4.5.2-1
    • 4.5.3-1
    • 4.5.3-1ubuntu0.1
    • 4.5.3-1ubuntu0.2
    • 4.5.3-1ubuntu0.2+esm1
    • 4.5.3-1ubuntu0.2+esm2
    • 4.5.3-1ubuntu0.2+esm3
    Affected ranges
    • ECOSYSTEM: < 4.5.3-1ubuntu0.2+esm4

    Update to 4.5.3-1ubuntu0.2+esm4

  • python-tornado Ubuntu:Pro:22.04:LTS

    Versions
    • 6.1.0-1build1
    • 6.1.0-2
    • 6.1.0-3
    • 6.1.0-3build1
    • 6.1.0-3ubuntu0.1~esm1
    • 6.1.0-3ubuntu0.1~esm2
    • 6.1.0-3ubuntu0.1~esm4
    • 6.1.0-3ubuntu0.1~esm5
    Affected ranges
    • ECOSYSTEM: < 6.1.0-3ubuntu0.1~esm6

    Update to 6.1.0-3ubuntu0.1~esm6

  • python-tornado Ubuntu:24.04:LTS

    Versions
    • 6.3.2-1
    • 6.4.0-0ubuntu1
    • 6.4.0-1
    • 6.4.0-1build1
    • 6.4.0-1ubuntu0.1
    • 6.4.0-1ubuntu0.2
    • 6.4.0-1ubuntu0.4
    • 6.4.0-1ubuntu0.5
    Affected ranges
    • ECOSYSTEM: < 6.4.0-1ubuntu0.6

    Update to 6.4.0-1ubuntu0.6

  • python-tornado Ubuntu:26.04:LTS

    Versions
    • 6.4.2-3
    • 6.5.2-3
    • 6.5.4-0.1
    • 6.5.4-0.1ubuntu0.1
    Affected ranges
    • ECOSYSTEM: < 6.5.4-0.1ubuntu0.2

    Update to 6.5.4-0.1ubuntu0.2

Original sources

Check your server →