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  4. CVE 2026 107835 owasp coraza waf cookie parser confusion
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Back to active CVEs
Medium · CVSS 4.0CVE-2026-107835

OWASP Coraza WAF: Cookie Parser ConfusionCVE-2026-107835

Answer in brief

CVE-2026-107835 records a Medium severity (CVSS 4.0) vulnerability in OWASP Coraza WAF: Cookie Parser Confusion. The current sources do not mark it as known exploited. The current feed maps corazawaf/coraza (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 9, 2026Updated Oct 9, 2026Source checked Oct 9, 2026First seen by HOL Oct 9, 2026Material review Oct 9, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 4.0
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 4.0. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps corazawaf/coraza (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
corazawaf/corazageneric<3.8.13.8.1

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for corazawaf/coraza.
  2. 2Review the reported fix. Update corazawaf/coraza to 3.8.1 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 9, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 9, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 9, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • OWASP Coraza WAF: ProcessURI silently drops QUERY_STRING and ARGS_GET on URI parse failure — defense-in-depth bypass for non-net/http integrationsSame corazawaf/coraza package
  • OWASP Coraza WAF: JSON body processor: argument-limit truncation reopens an unbounded-depth gjson.Valid stack overflow (process crash)Same corazawaf/coraza package
  • OWASP Coraza WAF: Unbounded recursion in JSON response body processor causes CPU exhaustionSame corazawaf/coraza package
  • OWASP Coraza WAF: Resource exhaustion via deferred file handle accumulation in multipart body processorSame corazawaf/coraza package
  • Moderator Toolbox before 4.0.14 Stored XSS via Removal Reasons ConfigurationSame generic ecosystem
  • Denial of Service via Eager Array Allocation During Deserialization in GuavaSame generic ecosystem

Record context

Vulnerability class
Missing Auth
EPSS
Not reported
CWE IDs
CWE-436
Source
CVE List V5
Source checked
Oct 9, 2026
References
4 linked sources
Open source record