CVE-2026-103022
Urwid: handle_short_request() crashes on non-ASCII POST body (UnicodeEncodeError DoS)
Urwid is a console user interface library for Python. Prior to 4.0.7, handle_short_request() in urwid/display/web.py performs unguarded character encoding on POST input and unguarded UTF-8 decoding on polling update socket output. A remote attacker who obtains a valid X-Urwid-ID session token can submit non-ASCII POST data that raises UnicodeEncodeError, while non-UTF-8 polling output raises UnicodeDecodeError, causing the CGI handler to return an error and terminate request processing. The POST exception path also leaves an opened file descriptor unclosed for the CGI process lifetime, so repeated requests can cause denial of service for the web display interface. This issue is fixed in version 4.0.7.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| urwid urwid |
< 4.0.7 (affected) | CNA: GitHub_M |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 5.3 medium |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L | CNA: GitHub_M |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://github.com/urwid/urwid/security/advisories/GHSA-cp25-j9x5-p5xmCNA: GitHub_M · x_refsource_CONFIRM
- https://github.com/urwid/urwid/pull/1201CNA: GitHub_M · x_refsource_MISC
- https://github.com/urwid/urwid/commit/b79d9a96843a6f5950bb2bfab5d059bdc61c538bCNA: GitHub_M · x_refsource_MISC
- https://github.com/urwid/urwid/releases/tag/4.0.7CNA: GitHub_M · x_refsource_MISC
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