High severityNVD Advisory· Published Mar 23, 2026· Updated Mar 23, 2026
CVE-2026-4602
CVE-2026-4602
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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
jsrsasignnpm | < 11.1.1 | 11.1.1 |
Affected products
2- jsrsasign/jsrsasigndescription
Patches
Vulnerability mechanics
References
6- github.com/advisories/GHSA-8qwj-4jxw-m8jwghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-4602ghsaADVISORY
- gist.github.com/Kr0emer/7ecd2be7d17419e4677315ef3758faf5ghsaWEB
- github.com/kjur/jsrsasign/commit/5ea1c32bb2aa894b4bd29849839afe4f98728195ghsaWEB
- github.com/kjur/jsrsasign/pull/650ghsaWEB
- security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15371175ghsaWEB
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