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CVE

CWE

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CVE-2026-4602

Published: Mar 23, 2026

Modified: Mar 23, 2026

PUBLISHED

CVSS v3.1

7.5

HIGH

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.

Vendor	Product	Versions
n/a	jsrsasign	affected `0 - < 11.1.1`

Weaknesses (CWE)

CVSS v3.1 Details

CVSS v3.1 Vector

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

References

https://security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15371175

https://gist.github.com/Kr0emer/7ecd2be7d17419e4677315ef3758faf5

https://github.com/kjur/jsrsasign/pull/650

https://github.com/kjur/jsrsasign/commit/5ea1c32bb2aa894b4bd29849839afe4f98728195

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