CVE WatchJul 28, 2026

CVE-2026-4258

Versions of the package sjcl before 1.0.9 are vulnerable to Improper Verification of Cryptographic Signature due to missing point-on-curve v

CVSS

7.5

High

EPSS

0.2%

p16

KEV

—

Exploit Today

0-100

Published: Mar 17, 2026 · Last modified: Jul 28, 2026 · CWE-347 · CWE-325

EPSS · 30d

0.2%EPSS · 30 days0.2%

2026-07-312026-08-27

Technical description

Versions of the package sjcl before 1.0.9 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.

Official references

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