{"cve":"CVE-2026-22779","nvd":{"published":"2026-01-14T17:16:09.150","modified":"2026-06-17T10:20:24.680","status":"Analyzed","description":"BlackSheep is an asynchronous web framework to build event based web applications with Python. Prior to 2.4.6, the HTTP Client implementation in BlackSheep is vulnerable to CRLF injection. Missing headers validation makes it possible for an attacker to modify the HTTP requests (e.g. insert a new header) or even create a new HTTP request. Exploitation requires developers to pass unsanitized user input directly into headers.The server part is not affected because BlackSheep delegates to an underlying ASGI server handling of response headers. This vulnerability is fixed in 2.4.6.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N","score":6.3},"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-113"],"references":["https://github.com/Neoteroi/BlackSheep/commit/bd4ecb9542b5d52442276b5a6907931b90f38d12","https://github.com/Neoteroi/BlackSheep/releases/tag/v2.4.6","https://github.com/Neoteroi/BlackSheep/security/advisories/GHSA-6pw3-h7xf-x4gp"],"products":["neoteroi:blacksheep"],"source":"nvd","synced_at":"2026-10-19T22:19:41.481987139+00:00"},"epss":{"cve":"CVE-2026-22779","score":0.00368,"percentile":0.30631,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-6pw3-h7xf-x4gp","url":"https://osv.dev/vulnerability/GHSA-6pw3-h7xf-x4gp","summary":"BlackSheep's ClientSession is vulnerable to CRLF injection","modified":"2026-07-07T17:57:21.550642283Z","packages":[{"ecosystem":"PyPI","name":"blacksheep","purl":"pkg:pypi/blacksheep","ranges":["<2.4.6"],"fixed":["2.4.6"]}]},{"id":"PYSEC-2026-1222","url":"https://osv.dev/vulnerability/PYSEC-2026-1222","summary":"BlackSheep's ClientSession is vulnerable to CRLF injection","modified":"2026-07-07T17:47:32.644648259Z","packages":[{"ecosystem":"PyPI","name":"blacksheep","purl":"pkg:pypi/blacksheep","ranges":["<2.4.6"],"fixed":["2.4.6"]}]}],"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."]}