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CVE-2026-104774— OWASP Coraza WAF: jsDecode Off-by-One in Octal Escape Handling Enables WAF Bypass

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 语言开发的 Web 应用防火墙（WAF）库。在版本 3.0.0 至 3.8.0 之间， 文件中第 64–70 行的 转换函数存在缺陷：其八进制缓冲区未正确排除反斜杠字符，导致 函数解析失败并返回空字节（null byte）。 当某个规则依赖于 ，且请求中包含 JavaScript 八进制转义序列时，便会触发该漏洞。未经身份验证的攻击者可以使用 JavaScript 八进制转义对攻击载荷进行编码，使得后端服务正确解码出预期的字节，

CVSS 5.8 · Medium EPSS 0.40% · P32

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-2026-104774

Vulnerability Information
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Vulnerability Title
OWASP Coraza WAF: jsDecode Off-by-One in Octal Escape Handling Enables WAF Bypass
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 t:jsDecode transformation in internal/transformations/js_decode.go:64-70 includes the backslash in the octal buffer, causing ParseInt to fail and return a null byte. The flaw is triggered when a rule relies on t:jsDecode and the request contains JavaScript octal escape sequences. An unauthenticated attacker can encode attack syntax with JavaScript octal escapes so the backend decodes the intended bytes while Coraza rules using t:jsDecode inspect corrupted null-byte output. The mismatch can bypass WAF rules and expose the protected application to attacks such as cross-site scripting or SQL injection. 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
编码错误
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-2026-104774

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III. Intelligence Information for CVE-2026-104774

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Patches & Fixes for CVE-2026-104774 (1)

Vendor Advisories for CVE-2026-104774 (1)

Vendor Pages for CVE-2026-104774 (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-2026-41508 5.8 MEDIUM OWASP Coraza WAF: Truncated multipart body bypasses MULTIPART_STRICT_ERROR (rule 200003) v

IV. Related Vulnerabilities

Same product: coraza
Same vendor: corazawaf
Same weakness: CWE-172

V. Comments for CVE-2026-104774

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