Bug 2536074 (CVE-2026-85078)

Summary: CVE-2026-85078 sanic: Sanic: Request smuggling via incomplete chunked-body handling
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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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, an open-source Python web server/framework. A remote, unauthenticated attacker can exploit incomplete handling of HTTP/1.1 chunked-body requests. By injecting malicious data into the request's trailer section, the attacker can cause Sanic to process a hidden second request. This vulnerability, known as HTTP request smuggling, can bypass security measures when Sanic is deployed behind other network devices.
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Description OSIDB Bzimport 2026-09-17 14:41:21 UTC 
Sanic is an opensource python web server/framework. In version 25.12.0, Sanic's core HTTP/1.1 chunked-body handling does not fully consume the trailer-part after the terminating zero chunk before reusing the keep-alive connection buffer. A remote unauthenticated client can place attacker-controlled bytes in that trailer region, causing Sanic to parse and route them as a hidden second request after the outer request. This breaks HTTP request-boundary integrity and can provide a request-smuggling primitive when Sanic is deployed behind intermediaries. This issue is fixed in version 25.12.1.