Vulnerability Details CVE-2026-22779
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 18.4%
CVSS Severity
CVSS v3 Score 5.3
References
Products affected by CVE-2026-22779
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cpe:2.3:a:neoteroi:blacksheep:0.2.7
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cpe:2.3:a:neoteroi:blacksheep:0.2.8
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cpe:2.3:a:neoteroi:blacksheep:0.2.9
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cpe:2.3:a:neoteroi:blacksheep:0.3.0
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cpe:2.3:a:neoteroi:blacksheep:0.3.1
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cpe:2.3:a:neoteroi:blacksheep:0.3.2
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cpe:2.3:a:neoteroi:blacksheep:1.0.0
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cpe:2.3:a:neoteroi:blacksheep:1.0.1
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cpe:2.3:a:neoteroi:blacksheep:1.0.2
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cpe:2.3:a:neoteroi:blacksheep:1.0.3
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cpe:2.3:a:neoteroi:blacksheep:1.0.4
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cpe:2.3:a:neoteroi:blacksheep:1.0.5
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cpe:2.3:a:neoteroi:blacksheep:1.0.6
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cpe:2.3:a:neoteroi:blacksheep:1.0.7
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cpe:2.3:a:neoteroi:blacksheep:1.0.8
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cpe:2.3:a:neoteroi:blacksheep:1.0.9
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cpe:2.3:a:neoteroi:blacksheep:1.1.0
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cpe:2.3:a:neoteroi:blacksheep:1.2.0
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cpe:2.3:a:neoteroi:blacksheep:1.2.1
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cpe:2.3:a:neoteroi:blacksheep:1.2.10
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cpe:2.3:a:neoteroi:blacksheep:1.2.11
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cpe:2.3:a:neoteroi:blacksheep:1.2.12
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cpe:2.3:a:neoteroi:blacksheep:1.2.13
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cpe:2.3:a:neoteroi:blacksheep:1.2.14
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cpe:2.3:a:neoteroi:blacksheep:1.2.15
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cpe:2.3:a:neoteroi:blacksheep:1.2.16
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cpe:2.3:a:neoteroi:blacksheep:1.2.17
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cpe:2.3:a:neoteroi:blacksheep:1.2.18
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cpe:2.3:a:neoteroi:blacksheep:1.2.19
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cpe:2.3:a:neoteroi:blacksheep:1.2.2
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cpe:2.3:a:neoteroi:blacksheep:1.2.20
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cpe:2.3:a:neoteroi:blacksheep:1.2.3
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cpe:2.3:a:neoteroi:blacksheep:1.2.4
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cpe:2.3:a:neoteroi:blacksheep:1.2.5
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cpe:2.3:a:neoteroi:blacksheep:1.2.6
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cpe:2.3:a:neoteroi:blacksheep:1.2.7
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cpe:2.3:a:neoteroi:blacksheep:1.2.8
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cpe:2.3:a:neoteroi:blacksheep:1.2.9
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cpe:2.3:a:neoteroi:blacksheep:2.0.0
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cpe:2.3:a:neoteroi:blacksheep:2.0.1
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cpe:2.3:a:neoteroi:blacksheep:2.0.2
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cpe:2.3:a:neoteroi:blacksheep:2.0.3
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cpe:2.3:a:neoteroi:blacksheep:2.0.4
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cpe:2.3:a:neoteroi:blacksheep:2.0.5
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cpe:2.3:a:neoteroi:blacksheep:2.0.6
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cpe:2.3:a:neoteroi:blacksheep:2.0.7
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cpe:2.3:a:neoteroi:blacksheep:2.0.8
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cpe:2.3:a:neoteroi:blacksheep:2.1.0
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cpe:2.3:a:neoteroi:blacksheep:2.2.0
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cpe:2.3:a:neoteroi:blacksheep:2.3.0
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cpe:2.3:a:neoteroi:blacksheep:2.3.1
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cpe:2.3:a:neoteroi:blacksheep:2.3.2
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cpe:2.3:a:neoteroi:blacksheep:2.4.0
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cpe:2.3:a:neoteroi:blacksheep:2.4.1
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cpe:2.3:a:neoteroi:blacksheep:2.4.2
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cpe:2.3:a:neoteroi:blacksheep:2.4.3
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cpe:2.3:a:neoteroi:blacksheep:2.4.4
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cpe:2.3:a:neoteroi:blacksheep:2.4.5