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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Jsrsasign Project | Jsrsasign | < 11.1.1 |
Related Weaknesses (CWE)
References
- https://gist.github.com/Kr0emer/7ecd2be7d17419e4677315ef3758faf5ExploitMitigationThird Party Advisory
- https://github.com/kjur/jsrsasign/commit/5ea1c32bb2aa894b4bd29849839afe4f9872819Patch
- https://github.com/kjur/jsrsasign/pull/650Issue Tracking
- https://security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15371175Third Party Advisory
FAQ
What is CVE-2026-4602?
CVE-2026-4602 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 o...
How severe is CVE-2026-4602?
CVE-2026-4602 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-4602?
Check the references section above for vendor advisories and patch information. Affected products include: Jsrsasign Project Jsrsasign.