Python
CVE-2026-22779
MEDIUM
GHSA-6pw3-h7xf-x4gp
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Lifecycle Timeline
3DescriptionGitHub Advisory
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.
AnalysisAI
BlackSheep's HTTP client prior to version 2.4.6 is vulnerable to CRLF injection due to insufficient header validation, allowing attackers to inject malicious headers or forge HTTP requests when developers pass unsanitized user input into header fields. Only applications using BlackSheep as an HTTP client are affected; the server component is not impacted. A patch is available in version 2.4.6 and later.
Technical ContextAI
Classified as CWE-113 (HTTP Response Splitting). Affects Blacksheep. 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 underly
RemediationAI
A vendor patch is available — apply it immediately. Fixed in version 2.4.6.. Restrict network access to the affected service where possible.
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Same weakness CWE-113 – HTTP Response Splitting
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External POC / Exploit Code
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