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FKIE_CVE-2026-84379

Vulnerability from fkie_nvd - Published: 2026-09-02 18:21 - Updated: 2026-09-09 21:05
Severity
5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Summary
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.
References
security-advisories@github.comhttps://github.com/pydantic/httpx2/commit/de96d810ee4e309d118982fe7084a46a2bcd600d
security-advisories@github.comhttps://github.com/pydantic/httpx2/pull/1142
security-advisories@github.comhttps://github.com/pydantic/httpx2/releases/tag/v2.11.0
security-advisories@github.comhttps://github.com/pydantic/httpx2/security/advisories/GHSA-h4x7-gw46-3wm6
134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/pydantic/httpx2/security/advisories/GHSA-h4x7-gw46-3wm6
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "httpx2",
          "vendor": "pydantic",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2.11.0"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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": "CVE-2026-84379",
  "lastModified": "2026-09-09T21:05:23.237",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 1.4,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-84379",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-09-02T18:20:04.628894Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-09-02T18:21:29.300",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/pydantic/httpx2/commit/de96d810ee4e309d118982fe7084a46a2bcd600d"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/pydantic/httpx2/pull/1142"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/pydantic/httpx2/releases/tag/v2.11.0"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/pydantic/httpx2/security/advisories/GHSA-h4x7-gw46-3wm6"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/pydantic/httpx2/security/advisories/GHSA-h4x7-gw46-3wm6"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-93"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}



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