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Advisory record · GHSA-c2m8-h5v5-343r

Tornado: StaticFileHandler follows symlinks outside static root (path traversal)

CVSS 8.2 HighEPSS 0.0052 · 44th percentile

Published by the GitHub Advisory Database at 30 Sept 2026, 23:48 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
tornadoPyPI<6.5.96.5.9
Identifiers
GHSA-c2m8-h5v5-343r · CVE-2026-103263
Weakness (CWE)
CWE-59
Tags
Published
30 Sept 2026
Updated
2 Oct 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Tornado versions before 6.5.9 are affected: StaticFileHandler follows symbolic links that resolve outside the static root, so an unauthenticated remote attacker who can place or reach such a symlink in the static directory can read arbitrary files readable by the server process. Upgrade to Tornado 6.5.9 or later, which fixes the issue. The source gives no workaround beyond upgrading.

Written 1 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
8.2 High 4.0 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N CNA (VulnCheck)
  • CISA KEV Not listed.
  • EPSS 0.0052, the 44th percentile, on 8 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:09 UTC First seen by agentprime
  2. 31 Oct 2026, 14:09 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.