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CVE-2026-104774 affects Coraza WAF versions 3.0.0 through 3.7.0. The t:jsDecode transformation incorrectly parses JavaScript octal escapes, replacing decoded characters with null bytes and allowing encoded malicious syntax to evade rules that depend on this normalization. Related decoding defects involve signed high-byte parsing and octal overflow handling. Version 3.8.0 corrects these defects.
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A WAF inspection bypass affecting Coraza WAF versions 3.0.0 through 3.7.0. Incorrect octal-escape decoding corrupts payload normalization, allowing encoded attack syntax to evade rules relying on t:jsDecode. Application compromise still requires the protected application to interpret the encoded input and be vulnerable to the underlying attack. The advisory assigns CVSS 3.1 severity 5.8 (Medium). Version 3.8.0 is identified as fixed; the fix also addresses related high-byte clamping in jsDecode and octal overflow saturation in escapeSeqDecode.
A medium-severity vulnerability affecting github.com/corazawaf/coraza/v3. The listed CVSS v3 score is 5.8, indicating network-accessible exploitation requiring no privileges or user interaction, with low integrity impact and changed scope. The content does not describe the underlying flaw. Updating the library and related packages to version 3.8.0 or later addresses the vulnerability.
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Cross-references every affected SKU, including bundled OEM variants.
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