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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-85077
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 15:16:54 UTC
Updated2026-09-21 21:17:13 UTC
DescriptionSanic 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.

Risk And Classification

Primary CVSS: v3.1 8.2 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N

EPSS: 0.002720000 probability, percentile 0.198100000 (date 2026-09-22)

Problem Types: CWE-113 | CWE-113 CWE-113: Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.2HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N
3.1CNADECLARED8.2HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Sanic-org Sanic affected < 24.12.1 Not specified
CNA Sanic-org Sanic affected >= 25.12.0, < 25.12.1 Not specified

References

ReferenceSourceLinkTags
github.com/sanic-org/sanic/pull/3164 [email protected] github.com
github.com/sanic-org/sanic/security/advisories/GHSA-m64h-22vf-48wm [email protected] github.com
github.com/sanic-org/sanic/commit/47349d689d65fa1907977ac100e867894aeafb22 [email protected] github.com
github.com/sanic-org/sanic/releases/tag/v25.12.1 [email protected] github.com
github.com/sanic-org/sanic/commit/9a95bb1c187558949606b915f5162c15f2db781b [email protected] github.com
github.com/sanic-org/sanic/commit/a332796506c7c588b6930b02a8886e43eb8ea8d6 [email protected] github.com
github.com/sanic-org/sanic/pull/3165 [email protected] github.com
github.com/sanic-org/sanic/releases/tag/v24.12.1 [email protected] github.com
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