{"cve":"CVE-2026-34517","nvd":{"published":"2026-04-01T21:16:59.870","modified":"2026-10-26T21:10:00.170","status":"Analyzed","description":"AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.13.4, for some multipart form fields, aiohttp read the entire field into memory before checking client_max_size. This issue has been patched in version 3.13.4.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U","score":2.7},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","score":5.3},"cwes":["CWE-770"],"references":["https://github.com/aio-libs/aiohttp/commit/cbb774f38330563422ca0c413a71021d7b944145","https://github.com/aio-libs/aiohttp/releases/tag/v3.13.4","https://github.com/aio-libs/aiohttp/security/advisories/GHSA-3wq7-rqq7-wx6j"],"products":["aiohttp:aiohttp"],"source":"nvd","synced_at":"2026-10-26T21:38:48.864438205+00:00"},"epss":{"cve":"CVE-2026-34517","score":0.00384,"percentile":0.32203,"date":"2026-10-26"},"kev":null,"osv":[{"id":"GHSA-3wq7-rqq7-wx6j","url":"https://osv.dev/vulnerability/GHSA-3wq7-rqq7-wx6j","summary":"AIOHTTP has late size enforcement for non-file multipart fields causes memory DoS","modified":"2026-09-10T03:50:42.683852324Z","packages":[{"ecosystem":"PyPI","name":"aiohttp","purl":"pkg:pypi/aiohttp","ranges":["<3.13.4"],"fixed":["3.13.4"]}]},{"id":"PYSEC-2026-2099","url":"https://osv.dev/vulnerability/PYSEC-2026-2099","summary":"","modified":"2026-07-13T07:15:20.410799609Z","packages":[{"ecosystem":"PyPI","name":"aiohttp","purl":"pkg:pypi/aiohttp","ranges":["<3.13.4"],"fixed":["3.13.4"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}