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CVE-2026-85078

sanic chunked trailer request smuggling allows hidden second request execution

CVSS 3.1 6.5 MEDIUMCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-85078

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-85078

Published

sanic

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "sanic-org",
                    "product": "sanic",
                    "versions": [
                        {
                            "version": "< 24.12.1",
                            "status": "affected"
                        },
                        {
                            "version": ">= 25.12.0, < 25.12.1",
                            "status": "affected"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON