CVE-2026-4258

HIGH EPSS 15.7%
Published Mar 17, 20263mo ago · Modified Jun 17, 20262w ago
7.7 CVSS 4.0
High
Find Similar
Published Mar 17, 2026 3mo ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
7.7
Exploitability
—
Impact
—
Vector string
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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
15.7% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 2

CWE-325
CWE-347

Affected Products 1

VendorProductVersionRange
bitwiseshiftleftstanford_javascript_crypto_library* ≤1.0.8

References 4

  • gist.github.com https://gist.github.com/Kr0emer/2560f98edb10b0b34f2438cd63913c47
    ExploitMitigationThird Party Advisory
  • github.com https://github.com/bitwiseshiftleft/sjcl/blob/master/core/ecc.js%23L454-L461
    Broken Link
  • github.com https://github.com/bitwiseshiftleft/sjcl/commit/ee307459972442a17beebc29dc331fffd8aff796
    Patch
  • security.snyk.io https://security.snyk.io/vuln/SNYK-JS-SJCL-15369617
    ExploitThird Party Advisory

Remediation

  • github.com https://github.com/bitwiseshiftleft/sjcl/commit/ee307459972442a17beebc29dc331fffd8aff796
    Patch