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CVE-2026-4600

Status: ModifiedHigh (8.1)—

Versions of the package jsrsasign before 11.1.1 are vulnerable to Improper Verification of Cryptographic Signature via the DSA domain-parameter validation in KJUR.crypto.DSA.setPublic (and the related DSA/X509 verification flow in src/dsa-2.0.js). An attacker can forge DSA signatures or X.509 certificates that X509.verifySignature() accepts by supplying malicious domain parameters such as g=1, y=1, and a fixed r=1, which make the verification equation true for any hash.

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

🎯 ATT&CK techniques

How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.

Vulnerabilidad en librería criptográfica (jsrsasign) accesible remotamente sin autenticación que permite forjar firmas DSA y certificados X.509. CWE-347 (verificación criptográfica impropia) + AV:N/PR:N/UI:N confirman explotación remota sin privilegios. El atacante puede falsificar certificados (T15

Inferred by our analysis agent from the official description, CVSS vector and CWE, and checked by a supervisor. May contain errors.

🛡️ ATT&CK mitigations that cover these techniques

Privileged Account ManagementVulnerability ScanningRestrict File and Directory PermissionsRestrict Registry PermissionsRemote Data StorageNetwork Segmentation

Affected technologies (1)

Kjur — Jsrsasign

CWEs

References

Raw JSON (NVD)

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