OWASP Coraza WAF: Cookie Parser Confusion

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-107835
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-09 18:17:05 UTC
Updated2026-10-09 19:16:41 UTC
DescriptionOWASP Coraza WAF is a golang modsecurity compatible web application firewall library. Prior to 3.8.1, internal/cookies.ParseCookies in internal/cookies/cookies.go handles boundary ASCII control characters and control-only or empty cookie names differently from several backend cookie parsers. An unauthenticated attacker can craft a Cookie header so Coraza indexes or drops a cookie under a different name or value from the backend application, causing rules targeting REQUEST_COOKIES or REQUEST_COOKIES_NAMES to miss application-visible attacker data. Exploitation depends on the backend parser and affected rule scope, and interior control characters with inconsistent backend behavior are outside this advisory's remediation. This issue is fixed in version 3.8.1.

Risk And Classification

Primary CVSS: v3.1 4 MEDIUM from [email protected]

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

Problem Types: CWE-436 | CWE-436 CWE-436: Interpretation Conflict

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary4MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N
3.1CNADECLARED4MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Corazawaf Coraza affected < 3.8.1 Not specified

References

ReferenceSourceLinkTags
github.com/corazawaf/coraza/security/advisories/GHSA-g4qm-m288-5cp9 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/corazawaf/coraza/releases/tag/v3.8.1 [email protected] github.com
github.com/corazawaf/coraza/commit/9f8521398d1ff023b958fad0b944cac265763866 [email protected] github.com
github.com/corazawaf/coraza/commit/0b940e197ad9983fb3aa36e84f1f81ff985461af [email protected] github.com
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