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CVE-2026-107833— OWASP Coraza WAF: Unbounded recursion in JSON response body processor causes CPU exhaustion

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、使用 Go 语言实现的 Web 应用程序防火墙（WAF）库。在版本 3.0.0 至 3.8.0 之间， 文件中的 函数将 值设置为 -1，并将其传递给 函数，而递归保护机制仅在检测到值为 0 时才停止。如果网络攻击者能够致使受 Coraza 保护的应用程序返回深层嵌套的 JSON 响应，则会导致响应体处理执行二次复杂度（quadratic complexity）的计算操作，在默认 ResponseBodyLimit 限制下，每个响应可能消耗

CVSS 5.9 · Medium

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

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-2026-107833

Vulnerability Information
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Vulnerability Title
OWASP Coraza WAF: Unbounded recursion in JSON response body processor causes CPU exhaustion
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, ProcessResponse in internal/bodyprocessors/json.go passes the ignoreJSONRecursionLimit value of -1 to readJSON, while the recursive guard only stops at zero. A network attacker who can cause an application protected by Coraza to return deeply nested JSON can make response-body processing perform quadratic work, consuming one CPU core for seconds per response within the default ResponseBodyLimit. Request JSON processing is not affected by this specific path because it uses the configured request recursion limit, and exploitation requires response-body inspection to be enabled. This issue is fixed in version 3.8.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的递归
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-2026-107833

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III. Intelligence Information for CVE-2026-107833

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Other References for CVE-2026-107833 (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-2026-107834 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
CVE-2026-107835 4.0 MEDIUM OWASP Coraza WAF: Cookie Parser Confusion

IV. Related Vulnerabilities

Same product: coraza
Same vendor: corazawaf
Same weakness: CWE-674

V. Comments for CVE-2026-107833

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