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CVE-2026-41508— OWASP Coraza WAF: Truncated multipart body bypasses MULTIPART_STRICT_ERROR (rule 200003) via silent io.ErrUnexpectedEOF handling

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 Go 语言 Web 应用防火墙（WAF）库。在版本 3.4.0 至 3.8.0 之间， 中的多部分（multipart）请求体处理器将 视为非致命错误，且未设置 标志。远程攻击者可以提交一个截断的多部分请求体，从而触发 错误，导致解析过程提前终止，且不会发出由推荐的安全防御规则所使用的“严格错误”（strict-error）信号。由于规则 200002 和 200003 未被触发，攻击者可以利用多部分解析分歧（multipart parse

CVSS 5.8 · Medium EPSS 0.49% · P41

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
corazawaf coraza >= 3.4.0, < 3.8.0 affected
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I. Basic Information for CVE-2026-41508

Vulnerability Information
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Vulnerability Title
OWASP Coraza WAF: Truncated multipart body bypasses MULTIPART_STRICT_ERROR (rule 200003) via silent io.ErrUnexpectedEOF handling
Source: CVE Program / CVE List V5
Vulnerability Description
OWASP Coraza WAF is a golang modsecurity compatible web application firewall library. From 3.4.0 until 3.8.0, the multipart processor in internal/bodyprocessors/multipart.go treats io.ErrUnexpectedEOF as nonfatal without setting MULTIPART_STRICT_ERROR. A remote attacker can submit a truncated multipart body that produces io.ErrUnexpectedEOF, causing parsing to stop without raising the strict-error signal used by the recommended defensive rule. Rules 200002 and 200003 do not fire, allowing multipart parser-disagreement payloads to reach a backend that interprets the truncated body differently. This issue is fixed in version 3.8.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
保护机制失效
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
corazawaf coraza >= 3.4.0, < 3.8.0 -

II. Public POCs for CVE-2026-41508

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III. Intelligence Information for CVE-2026-41508

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Patches & Fixes for CVE-2026-41508 (1)

Vendor Advisories for CVE-2026-41508 (1)

Vendor Pages for CVE-2026-41508 (1)

Same Patch Batch · corazawaf · 2026-10-12 · 4 CVEs total

CVE-2026-41510 7.2 HIGH OWASP Coraza WAF: Silent argument drop at ArgumentLimit allows bypass of ARGS-targeted rul
CVE-2026-41504 5.8 MEDIUM OWASP Coraza WAF: Native audit-log format allows CRLF injection and log forgery via reques
CVE-2026-104774 5.8 MEDIUM OWASP Coraza WAF: jsDecode Off-by-One in Octal Escape Handling Enables WAF Bypass

IV. Related Vulnerabilities

Same product: coraza
Same vendor: corazawaf
Same weakness: CWE-693

V. Comments for CVE-2026-41508

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