CVE-2026-85077 (GCVE-0-2026-85077)

Vulnerability from cvelistv5 – Published: 2026-09-17 14:26 – Updated: 2026-09-21 20:45
VLAI
Title
Sanic: HTTP response header injection via missing CR/LF validation in Sanic HTTP/1.1 responses
Summary
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.
Severity
8.2 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-21 20:45 UTC
CWE
  • CWE-113 - Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')
Assigner
References
Impacted products
Vendor Product Version
sanic-org sanic Affected: < 24.12.1
Affected: >= 25.12.0, < 25.12.1
Create a notification for this product.
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