{"cve":"CVE-2023-49082","nvd":{"published":"2023-11-29T20:15:08.180","modified":"2026-06-23T18:17:35.603","status":"Modified","description":"aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. Improper validation makes it possible for an attacker to modify the HTTP request (e.g. insert a new header) or even create a new HTTP request if the attacker controls the HTTP method. The vulnerability occurs only if the attacker can control the HTTP method (GET, POST etc.) of the request. If the attacker can control the HTTP version of the request it will be able to modify the request (request smuggling). This issue has been patched in version 3.9.0.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","score":5.3},"cwes":["CWE-20","CWE-93"],"references":["https://gist.github.com/jnovikov/7f411ae9fe6a9a7804cf162a3bdbb44b","https://github.com/aio-libs/aiohttp/commit/e4ae01c2077d2cfa116aa82e4ff6866857f7c466","https://github.com/aio-libs/aiohttp/pull/7806/files","https://github.com/aio-libs/aiohttp/security/advisories/GHSA-qvrw-v9rv-5rjx","https://gist.github.com/jnovikov/7f411ae9fe6a9a7804cf162a3bdbb44b"],"products":["aiohttp:aiohttp"],"source":"nvd","synced_at":"2026-10-19T21:42:07.670898610+00:00"},"epss":{"cve":"CVE-2023-49082","score":0.00948,"percentile":0.61185,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-qvrw-v9rv-5rjx","url":"https://osv.dev/vulnerability/GHSA-qvrw-v9rv-5rjx","summary":"aiohttp's ClientSession is vulnerable to CRLF injection via method","modified":"2026-09-10T03:49:59.157526982Z","packages":[{"ecosystem":"PyPI","name":"aiohttp","purl":"pkg:pypi/aiohttp","ranges":["<3.9.0"],"fixed":["3.9.0"]}]},{"id":"PYSEC-2023-251","url":"https://osv.dev/vulnerability/PYSEC-2023-251","summary":"","modified":"2024-01-29T16:41:42.479153Z","packages":[{"ecosystem":"PyPI","name":"aiohttp","purl":"pkg:pypi/aiohttp","ranges":["<3.9.0"],"fixed":["3.9.0"]}]}],"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."]}