Bug 2536070 (CVE-2026-85077)

Summary: CVE-2026-85077 sanic: Sanic: HTTP response header injection leading to session fixation or cache poisoning
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Priority: high    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in Sanic. The HTTP/1.1 response pipeline does not properly validate carriage-return or line-feed characters in response header names and values. This allows applications that place attacker-controlled data in response headers, filenames, or cookie attributes to inject additional headers or split responses. Depending on the application and proxy configuration, this can lead to session fixation through injected cookies, cache poisoning, or corruption of security headers.
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Description OSIDB Bzimport 2026-09-17 14:41:11 UTC 
Sanic is an opensource python web server/framework. Prior to version 24.12.1, and in version 25.12.0, the HTTP/1.1 response pipeline in sanic/response/types.py serializes response header names and values without rejecting carriage-return or line-feed characters. Applications that place attacker-controlled data in response.headers, file(..., filename=...), or cookie path and domain attributes can therefore emit injected headers and may split responses. Depending on application and proxy behavior, this can enable session fixation through injected cookies, cache poisoning, or security-header corruption. This issue is fixed in versions 24.12.1 and 25.12.1.