ATEN Unizon doCryptoHugeFileToFile Improper Verification of Cryptographic Signature Remote Code Execution Vulnerability

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

• aten unizonbefore 2.7.264

Versions reported by the vendor

Affected version ranges reported by the assigning authority (zdi). Independent of NVD's CPE analysis and usually ahead of it.

• ATEN Unizon

  • 2.6.253.001affected

Other highest-scoring records for the same primary product.

• CVE-2026-9776ATEN Unizon writeFileToHttpServletResponse Directory Traversal Information Disclosure Vulnerability
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• CVE-2026-5057ATEN Unizon RpcProvider Missing Authentication Denial-of-Service Vulnerability
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• CVE-2026-9778ATEN Unizon ImportDeviceList Directory Traversal Remote Code Execution Vulnerability
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• CVE-2026-9777ATEN Unizon restoreDB Directory Traversal Remote Code Execution Vulnerability
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• CVE-2026-9775ATEN Unizon uploadSSL Directory Traversal Arbitrary File Deletion Vulnerability
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• CVE-2026-9774ATEN Unizon updateLicense Directory Traversal Arbitrary File Deletion Vulnerability
  26Monitor

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Root cause

The verifier takes the algorithm to verify with from the token’s own header. Untrusted data ends up deciding its own verification rule.

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

1const claims = jwt.verify(token, publicKey);

1const claims = jwt.verify(token, publicKey, {2  algorithms: ["RS256"],3  issuer: "https://id.example.com",4  audience: "portal",5});

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.