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CVE-2026-107835— OWASP Coraza WAF: Cookie Parser Confusion

Quick assessment

Affected
corazawaf coraza
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OWASP Coraza WAF 是一个与 ModSecurity 兼容的、基于 Go 语言实现的 Web 应用防火墙（WAF）库。在 3.8.1 版本之前， 函数（位于 文件中）在处理边界 ASCII 控制字符，以及仅包含控制字符或为空的 Cookie 名称时，其行为与多个后端 Cookie 解析器存在差异。未经身份验证的攻击者可以构造特定的 Cookie 头部，使得 Coraza 对 Cookie 的索引或丢弃方式与后端应用程序所识别的名称或值不一致，从而导致针对 或 的检测规则无法捕获攻击者实际发送至后端的应

CVSS 4.0 · Medium

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
corazawaf coraza < 3.8.1 affected
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I. Basic Information for CVE-2026-107835

Vulnerability Information
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Vulnerability Title
OWASP Coraza WAF: Cookie Parser Confusion
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
解释冲突
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
corazawaf coraza < 3.8.1 -

II. Public POCs for CVE-2026-107835

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III. Intelligence Information for CVE-2026-107835

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Patches & Fixes for CVE-2026-107835 (2)

Vendor Advisories for CVE-2026-107835 (1)

Vendor Pages for CVE-2026-107835 (1)

Same Patch Batch · corazawaf · 2026-10-09 · 5 CVEs total

CVE-2026-107826 7.5 HIGH OWASP Coraza WAF: JSON body processor: argument-limit truncation reopens an unbounded-dept
CVE-2026-107833 5.9 MEDIUM OWASP Coraza WAF: Unbounded recursion in JSON response body processor causes CPU exhaustio
CVE-2026-107834 5.3 MEDIUM OWASP Coraza WAF: Resource exhaustion via deferred file handle accumulation in multipart b
CVE-2026-107825 4.0 MEDIUM OWASP Coraza WAF: ProcessURI silently drops QUERY_STRING and ARGS_GET on URI parse failure

IV. Related Vulnerabilities

Same product: coraza
Same vendor: corazawaf
Same weakness: CWE-436

V. Comments for CVE-2026-107835

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