CVE-2026-4258
High · 7.5CVSS
7.5
EPSS
0.4%
Published
Mar 17, 2026
CISA due date
—
The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| npm | sjcl | 0 | 1.0.9 |
Related vulnerabilities
- GHSA-2w8x-224x-785m sjcl is missing point-on-curve validation in sjcl.ecc.basicKey.publicKey Same vulnerability
- CVE-2026-87947 Improper Verification of Cryptographic Signature vulnerability in Drupal SAML SSO… CWE-347
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- CVE-2026-102271 PyJWT is a Python implementation of JSON Web Token standards. CWE-347
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- CVE-2026-102268 PyJWT is a Python implementation of JSON Web Token standards. CWE-347
- CVE-2026-102266 PyJWT is a Python implementation of JSON Web Token standards. CWE-347