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CVE-2026-85077

Sanic: HTTP response header injection via missing CR/LF validation in Sanic HTTP/1.1 responses

CVSS 3.1 8.2 HIGHCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-85077

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-85077

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