8.2

CVE-2026-103263: tornadoweb tornado Link Following

CVSS: 8.2v4.0HighDeferred
AliasesGHSA-c2m8-h5v5-343rUBUNTU-CVE-2026-103263DEBIAN-CVE-2026-103263
Published 01-10-2026Last modified 01-10-2026
Open JSON

Vulnerability summary

CVE-2026-103263 is a high (CVSS 8.2) Link Following vulnerability in tornadoweb tornado. EPSS estimates a 0.52% chance of exploitation in the next 30 days, higher than 43% of scored vulnerabilities.

Overall risk
33/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.2/10
010
High · v4.0 (CVE.org)
EPSS score
0.52%
0%100%
Low · Change unavailable
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 01-10-2026
    PublishedVulnerability first disclosed.
  2. 01-10-2026
    Last modifiedVulnerability information updated.

Description

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 metrics

8 scores · 5 sources · 2 versions

EPSS trend

Probability

0.52%

Chance of exploitation in the next 30 days

Percentile

43%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

02-10-202619-10-2026
EPSS score
0.52%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • python-tornadoAll versions (No fix recorded)
PyPI1 product
  • tornado< 6.5.9
Tornadoweb1 product
Ubuntu1 product
  • python-tornadoAll versions (No fix recorded)

4 vendors · 4 products

References

10 links