En bref
- CVE-2026-4258 est une vulnérabilité ÉLEVÉE (CVSS 7.5) touchant stanford javascript crypto library (bitwiseshiftleft), sjcl.
- Probabilité d'exploitation dans les 30 prochains jours (EPSS) : 0.26%, plus élevée que 17.9% des vulnérabilités.
- Correctif : mettre à jour vers 1.0.9 ou plus récent.
Description
All versions of the package sjcl are vulnerable to Improper Verification of Cryptographic Signature due to missing point-on-curve validation in sjcl.ecc.basicKey.publicKey(). An attacker can recover a victim's ECDH private key by sending crafted off-curve public keys and observing ECDH outputs. The dhJavaEc() function directly returns the raw x-coordinate of the scalar multiplication result (no hashing), providing a plaintext oracle without requiring any decryption feedback.
NVD description
Versions of the package sjcl before 1.0.9 are vulnerable to Improper Verification of Cryptographic Signature due to missing point-on-curve validation in sjcl.ecc.basicKey.publicKey(). An attacker can recover a victim's ECDH private key by sending crafted off-curve public keys and observing ECDH outputs. The dhJavaEc() function directly returns the raw x-coordinate of the scalar multiplication result (no hashing), providing a plaintext oracle without requiring any decryption feedback.
Running one of these products? Scan your site to see whether it exposes a vulnerable version.
Scan my site free