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CVE-2026-4603

Quick assessment

Affected
n/a jsrsasign
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
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/rsa.js和ext/jsbn.js中解析路径和归约逻辑存在除零错误，可能导致RSA公钥操作输出确定为零。

CVSS 5.9 · Medium EPSS 0.11% · P1

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-4603

Vulnerability Information
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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 Division by zero due to the RSASetPublic/KEYUTIL parsing path in ext/rsa.js and the BigInteger.modPowInt reduction logic in ext/jsbn.js. An attacker can force RSA public-key operations (e.g., verify and encryption) to collapse to deterministic zero outputs and hide “invalid key” errors by supplying a JWK whose modulus decodes to zero.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
除零错误
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/rsa.js和ext/jsbn.js中解析路径和归约逻辑存在除零错误，可能导致RSA公钥操作输出确定为零。
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 -

II. Public POCs for CVE-2026-4603

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III. Intelligence Information for CVE-2026-4603

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Patches & Fixes for CVE-2026-4603 (2)

Vendor Advisories for CVE-2026-4603 (1)

Other References for CVE-2026-4603 (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-2026-4602 7.5 HIGH jsrsasign 安全漏洞
CVE-2026-4600 7.4 HIGH 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-369

V. Comments for CVE-2026-4603

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