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CVE PROGRAM SOURCE RECORD8.2 High

CVE-2026-85077

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

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

sanic-org sanic

  • < 24.12.1affected
  • >= 25.12.0, < 25.12.1affected

References