CVE-2026-103263
Publication date 1 October 2026
Last updated 22 October 2026
Ubuntu priority
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.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| python-tornado | 26.10 stonking |
Fixed in 6.5.5-5ubuntu1
|
| 26.04 LTS resolute |
Fixed in 6.5.4-0.1ubuntu0.2
|
|
| 24.04 LTS noble |
Fixed in 6.4.0-1ubuntu0.6
|
|
| 22.04 LTS jammy |
Fixed in 6.1.0-3ubuntu0.1~esm6
|
|
| 20.04 LTS focal |
Fixed in 6.0.3+really5.1.1-3ubuntu0.1~esm6
|
|
| 18.04 LTS bionic |
Fixed in 4.5.3-1ubuntu0.2+esm4
|
|
| 16.04 LTS xenial |
Fixed in 4.2.1-1ubuntu3.1+esm4
|
Get expanded security coverage with Ubuntu Pro
Reduce your average CVE exposure time from 98 days to 1 day with expanded CVE patching, ten-years security maintenance and optional support for the full stack of open-source applications. Free for personal use.
Get Ubuntu Pro 30-day free trialSeverity score breakdown
CVSS version:
Base score
8.2 · High
Vector: 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
Base score
5.9 · Medium
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
References
Related Ubuntu Security Notices (USN)
- USN-8952-1
- Tornado vulnerabilities
- 22 October 2026
Other references
- https://www.cve.org/CVERecord?id=CVE-2026-103263
- https://github.com/tornadoweb/tornado/security/advisories/GHSA-c2m8-h5v5-343r
- https://github.com/tornadoweb/tornado/commit/437ab5f76565403b3403438d2e555d11f8128d32
- https://www.vulncheck.com/advisories/tornado-before-6.5.9-staticfilehandler-path-traversal-via-symlink