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CVE-2026-107834— OWASP Coraza WAF: Resource exhaustion via deferred file handle accumulation in multipart body processor

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 是一个兼容 ModSecurity 的 Go 语言 Web 应用防火墙库。从版本 3.0.0 至 3.8.0，内部组件 bodyprocessors/multipart.go 中的多部分（multipart）处理逻辑对每个上传的文件部分都执行了 defer temp.Close()，导致每个临时文件的文件描述符都会一直保持打开状态，直到整个请求处理完成。未认证的攻击者可以提交一个包含大量极小文件部分的多部分请求体，在请求体大小限制范围内耗尽进程的文件描述符表，从而导致 os.Cre

CVSS 5.3 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
corazawaf coraza >= 3.0.0, < 3.8.0 affected
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I. Basic Information for CVE-2026-107834

Vulnerability Information
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Vulnerability Title
OWASP Coraza WAF: Resource exhaustion via deferred file handle accumulation in multipart body processor
Source: CVE Program / CVE List V5
Vulnerability Description
OWASP Coraza WAF is a golang modsecurity compatible web application firewall library. From 3.0.0 until 3.8.0, the multipart loop in internal/bodyprocessors/multipart.go executes defer temp.Close() for every uploaded file part, so each temporary-file descriptor remains open until the complete request returns. An unauthenticated attacker can submit a multipart body containing many minimal file parts and exhaust the process file-descriptor table within the request-body size limit, causing os.CreateTemp failures, MULTIPART_STRICT_ERROR responses, blocked legitimate uploads, and process-wide inability to open files or sockets. 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:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
corazawaf coraza >= 3.0.0, < 3.8.0 -

II. Public POCs for CVE-2026-107834

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III. Intelligence Information for CVE-2026-107834

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Other References for CVE-2026-107834 (3)

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-2026-107825 4.0 MEDIUM OWASP Coraza WAF: ProcessURI silently drops QUERY_STRING and ARGS_GET on URI parse failure
CVE-2026-107835 4.0 MEDIUM OWASP Coraza WAF: Cookie Parser Confusion

IV. Related Vulnerabilities

Same product: coraza
Same vendor: corazawaf
Same weakness: CWE-400

V. Comments for CVE-2026-107834

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