UBUNTU-CVE-2026-84379 (CVE-2026-84379)

Vulnerability from osv_ubuntu – Published: 2026-09-02 18:21 – Updated: 2026-09-02 18:21 – Source website
VLAI
Details

HTTPX2 is a next generation HTTP client for Python. Prior to 2.11.0, FileField.render_headers() in src/httpx2/httpx2/_multipart.py directly interpolates attacker-controlled content_type values and custom headers from the files= three-element (filename, content, content_type) tuple and the files= four-element (filename, content, content_type, headers) tuple into multipart/form-data part headers without validating header names or values. CR or LF characters can terminate a part header, inject additional part headers, or end the part header block early, allowing a downstream multipart parser to treat attacker-supplied lines as genuine headers and potentially alter part semantics or bypass header-based checks. This issue is fixed in version 2.11.0.

Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-httpcore2",
            "binary_version": "2.5.0-1"
          },
          {
            "binary_name": "python3-httpx2",
            "binary_version": "2.5.0-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.10",
        "name": "python-httpx2",
        "purl": "pkg:deb/ubuntu/python-httpx2@2.5.0-1?arch=source\u0026distro=stonking"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.5.0-1"
      ]
    }
  ],
  "aliases": [],
  "details": "HTTPX2 is a next generation HTTP client for Python. Prior to 2.11.0, FileField.render_headers() in src/httpx2/httpx2/_multipart.py directly interpolates attacker-controlled content_type values and custom headers from the files= three-element (filename, content, content_type) tuple and the files= four-element (filename, content, content_type, headers) tuple into multipart/form-data part headers without validating header names or values. CR or LF characters can terminate a part header, inject additional part headers, or end the part header block early, allowing a downstream multipart parser to treat attacker-supplied lines as genuine headers and potentially alter part semantics or bypass header-based checks. This issue is fixed in version 2.11.0.",
  "id": "UBUNTU-CVE-2026-84379",
  "modified": "2026-09-02T18:21:00Z",
  "published": "2026-09-02T18:21:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-84379"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-84379"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/pydantic/httpx2/security/advisories/GHSA-h4x7-gw46-3wm6"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/pydantic/httpx2/pull/1142"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/pydantic/httpx2/commit/de96d810ee4e309d118982fe7084a46a2bcd600d"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/pydantic/httpx2/releases/tag/v2.11.0"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-84379"
  ]
}



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