CVE-2026-4258CWE-347

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…

High · published March 17, 2026

CVSS v4.0
8.7
EPSS
0%
Percentile
28.2
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
8.7 · HIGH
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P
EPSS
0.00357 · 28.2th percentile
Weakness
CWE-347 · Improper Verification of Cryptographic Signature
Published
2026-03-17T05:00Z
EPSS history
Timeline
  • 17 MAR 05:00Z
    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…
    cvelistv5