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CVE-2026-4258

Quick assessment

Affected
n/a sjcl
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

sjcl是bitwiseshiftleft个人开发者的一个已弃用的JavaScript加密库。 sjcl存在安全漏洞，该漏洞源于sjcl.ecc.basicKey.publicKey()缺少点在线验证，可能导致攻击者通过发送特制的离曲线公钥并观察ECDH输出来恢复受害者的ECDH私钥。

CVSS 7.5 · High EPSS 0.36% · P28

Affected Version Matrix 2

VendorProduct Version RangeStatus
n/a org.webjars.npm:sjcl < * affected
n/a sjcl < 1.0.9 affected
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I. Basic Information for CVE-2026-4258

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
sjcl 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
sjcl是bitwiseshiftleft个人开发者的一个已弃用的JavaScript加密库。 sjcl存在安全漏洞，该漏洞源于sjcl.ecc.basicKey.publicKey()缺少点在线验证，可能导致攻击者通过发送特制的离曲线公钥并观察ECDH输出来恢复受害者的ECDH私钥。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
- sjcl 0 ~ 1.0.9 -
- org.webjars.npm:sjcl 0 ~ * -

II. Public POCs for CVE-2026-4258

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 9493 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-4258

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Patches & Fixes for CVE-2026-4258 (1)

Vendor Advisories for CVE-2026-4258 (2)

Proof of Concept for CVE-2026-4258 (1)

Other References for CVE-2026-4258 (1)

IV. Related Vulnerabilities

Same vendor: n/a
Same weakness: CWE-347

V. Comments for CVE-2026-4258

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