CVE-2026-103022 (GCVE-0-2026-103022)

Vulnerability from cvelistv5 – Published: 2026-11-06 21:33 – Updated: 2026-11-06 21:33
VLAI
Title
Urwid: handle_short_request() crashes on non-ASCII POST body (UnicodeEncodeError DoS)
Summary
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.
Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CWE
  • CWE-116 - Improper Encoding or Escaping of Output
  • CWE-248 - Uncaught Exception
  • CWE-775 - Missing Release of File Descriptor or Handle after Effective Lifetime
Assigner
GitHub_M CNA
References
Impacted products
Vendor Product Version
urwid urwid Affected: < 4.0.7
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "urwid",
          "vendor": "urwid",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 4.0.7"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-116",
              "description": "CWE-116: Improper Encoding or Escaping of Output",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-248",
              "description": "CWE-248: Uncaught Exception",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-775",
              "description": "CWE-775: Missing Release of File Descriptor or Handle after Effective Lifetime",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-11-06T21:33:37.028Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/urwid/urwid/security/advisories/GHSA-cp25-j9x5-p5xm",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/urwid/urwid/security/advisories/GHSA-cp25-j9x5-p5xm"
        },
        {
          "name": "https://github.com/urwid/urwid/pull/1201",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/urwid/urwid/pull/1201"
        },
        {
          "name": "https://github.com/urwid/urwid/commit/b79d9a96843a6f5950bb2bfab5d059bdc61c538b",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/urwid/urwid/commit/b79d9a96843a6f5950bb2bfab5d059bdc61c538b"
        },
        {
          "name": "https://github.com/urwid/urwid/releases/tag/4.0.7",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/urwid/urwid/releases/tag/4.0.7"
        }
      ],
      "source": {
        "advisory": "GHSA-cp25-j9x5-p5xm",
        "discovery": "UNKNOWN"
      },
      "title": "Urwid: handle_short_request() crashes on non-ASCII POST body (UnicodeEncodeError DoS)"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-103022",
    "datePublished": "2026-11-06T21:33:37.028Z",
    "dateReserved": "2026-09-29T21:13:24.031Z",
    "dateUpdated": "2026-11-06T21:33:37.028Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}



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