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CVE-2026-4602

Quick assessment

Affected
n/a jsrsasign
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.

jsrsasign是Kenji Urushima个人开发者的一个签名验证库。 jsrsasign 11.1.1之前版本存在安全漏洞，该漏洞源于ext/jsbn2.js中处理负指数时存在数值类型转换错误，可能导致签名验证被破坏。

CVSS 7.5 · High EPSS 0.88% · P58

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 2

VendorProduct Version RangeStatus
n/a jsrsasign < 11.1.1 affected
n/a org.webjars.npm:jsrsasign < * affected
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I. Basic Information for CVE-2026-4602

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
Versions of the package jsrsasign before 11.1.1 are vulnerable to Incorrect Conversion between Numeric Types due to handling negative exponents in ext/jsbn2.js. An attacker can force the computation of incorrect modular inverses and break signature verification by calling modPow with a negative exponent.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
数值类型间的不正确转换
Source: CVE Program / CVE List V5
Vulnerability Title
jsrsasign 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
jsrsasign是Kenji Urushima个人开发者的一个签名验证库。 jsrsasign 11.1.1之前版本存在安全漏洞，该漏洞源于ext/jsbn2.js中处理负指数时存在数值类型转换错误，可能导致签名验证被破坏。
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
- jsrsasign 0 ~ 11.1.1 -
- org.webjars.npm:jsrsasign 0 ~ * -

II. Public POCs for CVE-2026-4602

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8004 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
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-4602

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Patches & Fixes for CVE-2026-4602 (2)

Vendor Advisories for CVE-2026-4602 (2)

Other References for CVE-2026-4602 (1)

Same Patch Batch · n/a · 2026-03-23 · 20 CVEs total

CVE-2026-4599 9.1 CRITICAL jsrsasign 安全漏洞
CVE-2026-4601 8.7 HIGH jsrsasign 安全漏洞
CVE-2026-4598 7.5 HIGH jsrsasign 安全漏洞
CVE-2026-4600 7.4 HIGH jsrsasign 安全漏洞
CVE-2026-4603 5.9 MEDIUM jsrsasign 安全漏洞
CVE-2026-4587 3.7 LOW HybridAuth SSL Curl.php certificate validation
CVE-2026-30006 XnSoft Nconvert 安全漏洞
CVE-2025-52204 Znuny 安全漏洞
CVE-2024-46879 Tiki 安全漏洞
CVE-2024-46878 Tiki 安全漏洞
CVE-2024-51224 PHPGurukul Vehicle Record Management System 安全漏洞
CVE-2026-30007 XnSoft Nconvert 安全漏洞
CVE-2026-24516 Droplet Agent 安全漏洞
CVE-2026-26829 OwnTone 安全漏洞
CVE-2026-26828 OwnTone 安全漏洞
CVE-2024-51222 PHPGurukul Vehicle Record Management System 安全漏洞
CVE-2024-51226 PHPGurukul Vehicle Record Management System 安全漏洞
CVE-2024-51223 PHPGurukul Vehicle Record Management System 安全漏洞
CVE-2024-51225 PHPGurukul Vehicle Record Management System 安全漏洞

IV. Related Vulnerabilities

Same product: jsrsasign
Same vendor: n/a
Same weakness: CWE-681

V. Comments for CVE-2026-4602

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