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Global apt Government and Defense CRITICAL 37m Global general Technology / Consumer Protection MEDIUM 48m Global vulnerability Information Technology and Security CRITICAL 56m Global vulnerability Information Technology CRITICAL 1h Global apt Infrastructure, Transportation, Finance/Investment HIGH 1h Global vulnerability Information Technology and Infrastructure HIGH 2h Global data_breach Education HIGH 3h Global data_breach Education HIGH 4h Global vulnerability Information Technology CRITICAL 4h Global supply_chain Software Development and Technology HIGH 5h Global apt Government and Defense CRITICAL 37m Global general Technology / Consumer Protection MEDIUM 48m Global vulnerability Information Technology and Security CRITICAL 56m Global vulnerability Information Technology CRITICAL 1h Global apt Infrastructure, Transportation, Finance/Investment HIGH 1h Global vulnerability Information Technology and Infrastructure HIGH 2h Global data_breach Education HIGH 3h Global data_breach Education HIGH 4h Global vulnerability Information Technology CRITICAL 4h Global supply_chain Software Development and Technology HIGH 5h Global apt Government and Defense CRITICAL 37m Global general Technology / Consumer Protection MEDIUM 48m Global vulnerability Information Technology and Security CRITICAL 56m Global vulnerability Information Technology CRITICAL 1h Global apt Infrastructure, Transportation, Finance/Investment HIGH 1h Global vulnerability Information Technology and Infrastructure HIGH 2h Global data_breach Education HIGH 3h Global data_breach Education HIGH 4h Global vulnerability Information Technology CRITICAL 4h Global supply_chain Software Development and Technology HIGH 5h
Vulnerabilities

CVE-2026-4603

Medium ⚡ Exploit Available
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.j
CWE-369 — Weakness Type
Published: Mar 23, 2026  ·  Modified: Mar 24, 2026  ·  Source: NVD
CVSS v3
5.9
🔗 NVD Official
📄 Description (English)

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.

🤖 AI Executive Summary

CVE-2026-4603 is a division by zero vulnerability in jsrsasign versions before 11.1.1 affecting RSA public-key operations through malformed JWK modulus values. An attacker can force cryptographic operations to produce deterministic zero outputs, potentially bypassing signature verification and encryption security controls.

📄 Description (Arabic)

تؤثر هذه الثغرة على مكتبة jsrsasign وتسمح للمهاجمين بتوفير قيم JWK معيبة بـ modulus صفري. يمكن للهجوم أن يسبب فشل التحقق من التوقيع بصمت أو إنتاج مخرجات قابلة للتنبؤ من التشفير، مما يعرض المصادقة والسرية للخطر.

🤖 ملخص تنفيذي (AI)

This vulnerability in jsrsasign library affects RSA cryptographic operations by allowing attackers to supply specially crafted JWK values with zero modulus. The flaw can cause signature verification to fail silently or encryption to produce predictable outputs, compromising authentication and confidentiality.

🤖 AI Intelligence Analysis Analyzed: May 24, 2026 16:32
🇸🇦 Saudi Arabia Impact Assessment
Saudi Relevance: high
🏢 Affected Saudi Sectors
banking government telecom
🎯 MITRE ATT&CK Techniques
⚖️ Saudi Risk Score (AI)
6.0
/ 10.0
🔧 Remediation Steps (English)
Immediately upgrade jsrsasign to version 11.1.1 or later. Implement input validation to reject JWK objects with zero or invalid modulus values before processing. Add cryptographic operation result validation to detect and reject zero outputs from RSA operations.
🔧 خطوات المعالجة (العربية)
قم بترقية jsrsasign فوراً إلى الإصدار 11.1.1 أو أحدث. طبق التحقق من صحة المدخلات لرفض كائنات JWK ذات قيم modulus صفرية أو غير صالحة قبل المعالجة. أضف التحقق من نتائج العمليات التشفيرية لكشف ورفض المخرجات الصفرية من عمليات RSA.
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
5.2.1 5.2.2
🔵 SAMA CSF
AC-3 SC-13
🟡 ISO 27001:2022
A.10.1.1 A.13.1.1
📦 Affected Products / CPE 1 entries
jsrsasign_project:jsrsasign
📊 CVSS Score
5.9
/ 10.0 — Medium
📊 CVSS Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Attack VectorL — Low / Local
Attack ComplexityL — Low / Local
Privileges RequiredN — None / Network
User InteractionN — None / Network
ScopeU — Unchanged
ConfidentialityL — Low / Local
IntegrityL — Low / Local
AvailabilityL — Low / Local
📋 Quick Facts
Severity Medium
CVSS Score5.9
CWECWE-369
Exploit ✓ Yes
Patch ✓ Yes
Published 2026-03-23
Source Feed nvd
Views 4
🇸🇦 Saudi Risk Score
6.0
/ 10.0 — Saudi Risk
Priority: MEDIUM
🏷️ Tags
exploit-available patch-available CWE-369
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