Is CVE-2026-4258 actively exploited?

No active exploitation of CVE-2026-4258 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-4258 be exploited remotely?

Yes. CVE-2026-4258 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-4258?

CVE-2026-4258 has a CVSS score of 7.5 (HIGH).

HOME VULNERABILITIESCVE-2026-4258

HIGH

CVE-2026-4258

CWE-347Published: March 17, 2026· Updated: Mar 17, 2026

7.5

CVSS v3.1

EPSS:0.02%probability of exploitation in 30 daysPercentile:5.2th

Official 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 Source

Technical Analysis

CVE-2026-4258 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 7.5.