CVE-2026-4603
Description
A flaw was found in jsrsasign. An attacker can exploit a division by zero vulnerability by supplying a specially crafted JSON Web Key (JWK) whose modulus decodes to zero. This vulnerability can force RSA public-key operations, such as verification and encryption, to produce deterministic zero outputs. This impacts the reliability and integrity of cryptographic operations and can conceal "invalid key" errors.
Statement
This flaw has a MODERATE impact. A division by zero vulnerability in jsrsasign, as used in Red Hat Migration Toolkit for Virtualization and Red Hat Quay, allows an attacker to provide a malicious JSON Web Key (JWK) that can lead to incorrect RSA public-key operation outputs and mask key validation errors. This compromises the reliability and integrity of cryptographic processes within affected Red Hat products.
Mitigation
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 5.9 | 5.3 | N/A |
| Attack Vector | Local | Local | N/A |
| Attack Complexity | Low | Low | N/A |
| Privileges Required | None | Low | N/A |
| User Interaction | None | None | N/A |
| Scope | Unchanged | Unchanged | N/A |
| Confidentiality | Low | Low | N/A |
| Integrity Impact | Low | Low | N/A |
| Availability Impact | Low | Low | N/A |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
NVD: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Understanding the Weakness (CWE)
Availability
Technical Impact: DoS: Crash, Exit, or Restart
A Divide by Zero results in a crash.
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