{"id":"CVE-2026-34514","aliases":["GHSA-2vrm-gr82-f7m5","PYSEC-2026-2096"],"url":"https://o3.security/vulnerability/CVE-2026-34514","summary":"AIOHTTP: CRLF injection in multipart part content type header construction","details":"### Summary\n\nAn attacker who controls the `content_type` parameter in aiohttp could use this to inject extra headers or similar exploits.\n\n### Impact\n\nIf an application allows untrusted data to be used for the multipart `content_type` parameter when constructing a request, an attacker may be able to manipulate the request to send something other than what the developer intended.\n\n-----\n\nPatch: https://github.com/aio-libs/aiohttp/commit/9a6ada97e2c6cf1ce31727c6c9fcea17c21f6f06","published":"2026-04-01T20:09:50.936Z","modified":"2026-08-12T03:51:46.940028081Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"aiohttp","fixedVersion":"3.13.4"}],"fix":{"url":"https://github.com/aio-libs/aiohttp/commit/9a6ada97e2c6cf1ce31727c6c9fcea17c21f6f06","label":"aio-libs/aiohttp@9a6ada9"},"references":[{"type":"WEB","url":"https://github.com/aio-libs/aiohttp/releases/tag/v3.13.4"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34514.json"},{"type":"ADVISORY","url":"https://github.com/aio-libs/aiohttp/security/advisories/GHSA-2vrm-gr82-f7m5"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-34514"},{"type":"FIX","url":"https://github.com/aio-libs/aiohttp/commit/9a6ada97e2c6cf1ce31727c6c9fcea17c21f6f06"},{"type":"PACKAGE","url":"https://github.com/aio-libs/aiohttp"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:46.940028081Z"}}