{"id":"CVE-2026-84379","title":"HTTPX2 is a next generation HTTP client for Python","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-ele…","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","cwe":["CWE-93"],"vendor":"httpx2","product":"httpx2","affected":["httpx2 < 2.11.0"],"patched":["httpx2 2.11.0"],"published":"2026-09-02","updated":"2026-09-09","sourceUpdated":"2026-09-09T21:05:23.237","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-84379","references":[{"url":"https://github.com/pydantic/httpx2/commit/de96d810ee4e309d118982fe7084a46a2bcd600d","label":"security-advisories@github.com"},{"url":"https://github.com/pydantic/httpx2/pull/1142","label":"security-advisories@github.com"},{"url":"https://github.com/pydantic/httpx2/releases/tag/v2.11.0","label":"security-advisories@github.com"},{"url":"https://github.com/pydantic/httpx2/security/advisories/GHSA-h4x7-gw46-3wm6","label":"security-advisories@github.com"},{"url":"https://github.com/pydantic/httpx2/security/advisories/GHSA-h4x7-gw46-3wm6","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-84379"},{"url":"https://github.com/pydantic/httpx2"},{"url":"https://github.com/advisories/GHSA-h4x7-gw46-3wm6"},{"url":"https://pypi.org/project/httpx2"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-84379.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-84379"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2527696"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-84379"}],"tags":["nvd","osv","pip","ghsa","csaf","vex","red-hat"],"epss":0.00261,"epssPercentile":0.18169,"aliases":["GHSA-h4x7-gw46-3wm6","PYSEC-2026-3848"],"ecosystem":"pip","ingestedAt":"2026-09-08T21:11:12.322Z","slug":"CVE-2026-84379","body":"## Overview\n\nHTTPX2 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-84379)\n\nAffected packages:\n\n- `httpx2 < 2.11.0`\n\nPatched in:\n\n- `httpx2 2.11.0`\n\nSource: https://osv.dev/vulnerability/GHSA-h4x7-gw46-3wm6\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Lightspeed Core, Red Hat OpenShift AI (RHOAI) · no fix planned: Lightspeed Core, Red Hat OpenShift AI (RHOAI) · updated 2026-09-22 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-84379.json)","depth":"sunlit","depthScore":29,"depthScoreParts":{"impact":29.2,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}