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CVE-2026-107826— OWASP Coraza WAF: JSON body processor: argument-limit truncation reopens an unbounded-depth gjson.Valid stack overflow (process crash)

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、用 Go 语言实现的 Web 应用防火墙（WAF）库。在 3.0.0 至 3.8.1 版本中， 文件中的 函数在读取 JSON 数据时，会先执行一个带有边界限制（bounded）的扁平化遍历操作。该遍历会在达到 配置值或字节预算限制时提前终止，随后再对完整的原始请求体调用 进行合法性校验。 攻击者无需认证即可构造恶意 Payload：先提交浅层的 JSON 值，然后附加一个极深嵌套的 JSON 尾部结构。由于这部分深层嵌套结构未被前面的边界

CVSS 7.5 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
corazawaf coraza >= 3.0.0, < 3.8.1 affected
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I. Basic Information for CVE-2026-107826

Vulnerability Information
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Vulnerability Title
OWASP Coraza WAF: JSON body processor: argument-limit truncation reopens an unbounded-depth gjson.Valid stack overflow (process crash)
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 3.8.1, readJSON in internal/bodyprocessors/json.go can stop its bounded flattening walk after reaching SecArgumentsLimit or the byte budget and then call gjson.Valid on the complete raw body. An unauthenticated attacker can submit shallow values followed by an extremely deeply nested JSON tail that was not visited by the bounded walk, causing gjson.Valid to recurse without a depth bound and terminate the hosting process with an unrecoverable fatal stack overflow. The ProcessRequest and ProcessResponse JSON paths share the affected readJSON validation flow, and the payload can remain within recommended body-size and argument-count limits. This issue is fixed in version 3.8.1.
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: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, < 3.8.1 -

II. Public POCs for CVE-2026-107826

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III. Intelligence Information for CVE-2026-107826

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Other References for CVE-2026-107826 (3)

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

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
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-2026-107826

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