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GHSA-2w8x-224x-785m

sjcl is missing point-on-curve validation in sjcl.ecc.basicKey.publicKey

Source: GitHub Advisory Database (reviewed) High CVE-2026-4258

Packages

EcosystemPackageAffectedFixed in
npm sjcl < 1.0.9 1.0.9

Details

As written in the advisory (Markdown source, shown as plain text).

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.

References

External links from the advisory. They lead to third-party sites.