CVE WatchSep 21, 2026

CVE-2026-85077

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 sani

CVSS

8.2

High

EPSS

0.3%

p20

KEV

—

Exploit Today

0-100

Published: Sep 17, 2026 · Last modified: Sep 21, 2026 · CWE-113

EPSS · 30d

0.3%EPSS · 30 days0.3%

2026-09-182026-09-21

Technical 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.

Official references

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