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CVE-2026-107835

4.0 · MEDIUM

OWASP Coraza WAF is a golang modsecurity compatible web application firewall library.

Published Oct 9, 2026CWE-436EPSS 0.30%

Overview

CVE-2026-107835 is a medium-severity vulnerability. It was published on October 9, 2026 and has a CVSS 3.1 base score of 4.0 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 4.0, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/corazawaf/coraza/commit/0b940e197ad9983fb3aa36e84f1f81ff985461afGitHubgithub.com/corazawaf/coraza/commit/9f8521398d1ff023b958fad0b944cac265763866GitHubgithub.com/corazawaf/coraza/releases/tag/v3.8.1GitHubgithub.com/corazawaf/coraza/security/advisories/GHSA-g4qm-m288-5cp9GitHubgithub.com/corazawaf/coraza/security/advisories/GHSA-g4qm-m288-5cp9

How CyberStrike helps

Frequently asked questions

What is CVE-2026-107835?

CVE-2026-107835 is a medium-severity vulnerability. It was published on October 9, 2026 and has a CVSS 3.1 base score of 4.0 (MEDIUM).

How severe is CVE-2026-107835?

This vulnerability has a CVSS 3.1 base score of 4.0, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-107835?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-107835?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-107835 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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