CVE-2026-4602

HIGH 7.5

CVSS Score

7.5

EPSS Score

0.5%

EPSS Percentile

39th

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.

CWE	CWE-681
Vendor	n/a
Product	jsrsasign
Published	Mar 23, 2026
Last Updated	Jul 20, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Affected Versions

n/a / jsrsasign

0 < 11.1.1

n/a / org.webjars.npm:jsrsasign

0 < *

References

NVD ↗ CVE.org ↗ EPSS Data ↗

Credits

Kr0emer