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.

INFO

Published Date :

2026-03-17T05:00:04.199Z

Last Modified :

2026-03-17T13:22:11.049Z

Source :

snyk
AFFECTED PRODUCTS

The following products are affected by CVE-2026-4258 vulnerability.

Vendors Products
Bitwiseshiftleft
  • Sjcl
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-4258.

URL Resource
https://gist.github.com/Kr0emer/2560f98edb10b0b34f2438cd63913c47 cve-icon cve-icon cve-icon
https://github.com/bitwiseshiftleft/sjcl/blob/master/core/ecc.js%23L454-L461 cve-icon cve-icon
https://github.com/bitwiseshiftleft/sjcl/commit/ee307459972442a17beebc29dc331fffd8aff796 cve-icon cve-icon
https://security.snyk.io/vuln/SNYK-JS-SJCL-15369617 cve-icon cve-icon cve-icon
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CVSS Vulnerability Scoring System

Detailed values of each vector for above chart.
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Detailed values of each vector for above chart.
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact