CVE-2026-107835
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…
Does this matter?
Lower severity and a low EPSS score (0.30%). Track it; it rarely justifies an emergency change on its own.
Description
OWASP 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.
- CVSS 3.1
- 4.0 MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N
- EPSS
- 0.30% probability · 22th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-436
- Source
- security-advisories@github.com
EPSS moved from 0.3% on 10 October 2026 to 0.3% on 26 October 2026.
References
- https://github.com/corazawaf/coraza/commit/0b940e197ad9983fb3aa36e84f1f81ff985461af
- https://github.com/corazawaf/coraza/commit/9f8521398d1ff023b958fad0b944cac265763866
- https://github.com/corazawaf/coraza/releases/tag/v3.8.1
- https://github.com/corazawaf/coraza/security/advisories/GHSA-g4qm-m288-5cp9
- https://github.com/corazawaf/coraza/security/advisories/GHSA-g4qm-m288-5cp9
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.