CVE-2026-103263CWE-59

CVE-2026-103263

Medium · published October 1, 2026

CVSS v3.1
5.9
EPSS
1%
Percentile
43.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.9 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS v4.0
8.2 · 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
EPSS
0.00522 · 43.4th percentile
Weakness
CWE-59 · Improper Link Resolution Before File Access ('Link Following')
Published
2026-10-01T15:17Z
References (4)
https://github.com/tornadoweb/tornado/commit/437ab5f76565403b3403438d2e555d11f8128d32 · [email protected]https://github.com/tornadoweb/tornado/security/advisories/GHSA-c2m8-h5v5-343r · [email protected]https://www.vulncheck.com/advisories/tornado-before-6.5.9-staticfilehandler-path-traversal-via-symlink · [email protected]https://github.com/tornadoweb/tornado/security/advisories/GHSA-c2m8-h5v5-343r · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 03 OCT 03:41Z
    EPSS moved — → 1%
    epss
  • 01 OCT 10:42Z
    Tornado before 6.5.9 StaticFileHandler Path Traversal via Symlink
    cvelistv5