CVE-2026-4602
HIGH
7.5
CVSS Score
Published: March 23, 2026 at 05:00 AM UTC
Updated: September 10, 2026 at 01:20 PM UTC
1 product affected across 1 vendorJsrsasign
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Severity
HIGH7.5
Exploit prediction
EPSS 0.5%
SSVC
PoC
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.
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
References (15)
ExploitMitigationThird Party Advisory
Source: cverecord
https://gist.github.com/Kr0emer/7ecd2be7d17419e4677315ef3758faf5Patch
Source: cverecord
https://github.com/kjur/jsrsasign/commit/5ea1c32bb2aa894b4bd29849839afe4f98728195Source: cverecord
https://security.snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-15812274Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/errata/RHSA-2026:19375Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/errata/RHSA-2026:19409Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/errata/RHSA-2026:19410SSVC — Action Prioritization
SSVCPoCAutomatablePartial impact
SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.
CVSS
7.5HIGHsnyk
- Attack Vector
- NETWORK
- Complexity
- LOW
- Privileges
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- NONE
- Integrity
- NONE
- Availability
- HIGH
Vector?
Quick Info
StatusMODIFIED
CWE
CWE-681
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