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Jwt Attack CVE-2026-4258

| EUVD-2026-12542 HIGH
Improper Verification of Cryptographic Signature (CWE-347)
2026-03-17 snyk GHSA-2w8x-224x-785m
Information Disclosure Debian Oracle Jwt Attack Sjcl
7.5
CVSS 3.1
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CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

Lifecycle Timeline

4
Patch released
Mar 31, 2026 - 21:13 nvd
Patch available
EUVD ID Assigned
Mar 17, 2026 - 08:13 euvd
EUVD-2026-12542
Analysis Generated
Mar 17, 2026 - 08:13 vuln.today
CVE Published
Mar 17, 2026 - 05:00 nvd
HIGH 7.5

Blast Radius

ecosystem impact
† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth
  • 1,183 npm packages depend on sjcl (351 direct, 835 indirect)

Ecosystem-wide dependent count for version 1.0.9.

DescriptionNVD

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.

AnalysisAI

A cryptographic vulnerability in the Stanford Javascript Crypto Library (SJCL) allows attackers to recover victims' ECDH private keys through a missing point-on-curve validation flaw. The vulnerability affects all versions of SJCL and enables remote attackers to send specially crafted off-curve public keys and observe ECDH outputs to extract private key material. …

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RemediationAI

Within 24 hours: Inventory all applications and systems using SJCL library and assess exposure scope; notify stakeholders of affected systems. Within 7 days: Implement code review to identify ECDH usage patterns; disable SJCL ECDH functionality where possible and replace with patched alternatives (consider transitioning to libsodium, NaCl, or equivalent). …

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Vendor StatusVendor

Debian

Bug #924588
node-sjcl
Release Status Fixed Version Urgency
open - -

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CVE-2026-4258 vulnerability details – vuln.today
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