{"items":[{"id":"NVI-00014058","kind":"vulnerability","title":"HTTPX2: Multipart part header injection via unvalidated file Content-Type and custom headers","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-h4x7-gw46-3wm6","CVE-2026-84379"],"plain_summary":"GitHub lists this reviewed advisory for httpx2. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-3a37fdcd9f6ff951f47da494ad4686ff"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-09-08T20:45:44.000Z","value":"5.3 medium","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-3a37fdcd9f6ff951f47da494ad4686ff"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-3a37fdcd9f6ff951f47da494ad4686ff","url":"https://github.com/advisories/GHSA-h4x7-gw46-3wm6","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-h4x7-gw46-3wm6","publisher":"GitHub Advisory Database","observed_at":"2026-11-02T02:20:31.767Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-3a37fdcd9f6ff951f47da494ad4686ff"],"technology":"httpx2","known_exclusions":[],"conditions_summary":"### Summary\n\nHTTPX2 serializes the per-file `Content-Type` and custom headers supplied through the `files=` tuple API directly into the `multipart/form-data` body without validating custom header names or values. An attacker who can influence upload metadata passed to HTTPX2 can use CR or LF characters to terminate a multipart part header and inject additional part headers or end the part header block early.\n\n### Details\n\nThe three-element file tuple accepts `(filename, content, content_type)`, and the four-element form accepts `(filename, content, content_type, headers)`. `FileField.render_headers()` interpolates the supplied header names and values between CRLF delimiters without validating them.\n\nFor example:\n\n```python\nimport httpx2\n\nrequest = httpx2.Request(\n    \"POST\",\n    \"https://example.com/upload\",\n    headers={\"Content-Type\": \"multipart/form-data; boundary=BOUNDARY\"},\n    files={\n        \"file\": (\n            \"safe.txt\",\n            b\"payload\",\n            \"text/plain\\r\\nX-Injected: true\",\n        )\n    },\n)\n\nprint(request.read().decode())\n```\n\nThe generated body contains an attacker-injected part header:\n\n```text\n--BOUNDARY\nContent-Disposition: form-data; name=\"file\"; f","public_affected_ranges":["< 2.11.0"]}],"null_published_at":"2026-11-02T10:00:37.201Z","source_updated_at":"2026-09-08T20:45:44.000Z","source_disclosed_at":"2026-09-08T20:45:43.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"First indexed by Null; source disclosure date is shown separately.","null_first_observed_at":"2026-11-02T02:20:31.767Z"}],"next_cursor":null,"snapshot_revision":"42594"}