CVE-2026-4258EPSS p15.5%
CVE-2026-4258CVE-2026-4258
bitwiseshiftleft / stanford_javascript_crypto_library
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.
Scoring
| CVSS | 7.5 () |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
| EPSS | 0.25% probability of exploitation · percentile 15.5% · 2026-06-19T12:03:05Z |
| Last modified | 2026-06-03 |
Related by meaning· 6
Nearest entities by semantic similarity across the cs-graph corpus.