CVE-2026-4602 | THREATINT

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.

PUBLISHED Reserved 2026-03-22 | Published 2026-03-23 | Updated 2026-03-23 | Assigner snyk

HIGH: 8.7CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P

HIGH: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P

Problem types

Incorrect Conversion between Numeric Types

Credits

Kr0emer

References

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

gist.github.com/Kr0emer/7ecd2be7d17419e4677315ef3758faf5

github.com/kjur/jsrsasign/pull/650

github.com/...ommit/5ea1c32bb2aa894b4bd29849839afe4f98728195

cve.org (CVE-2026-4602)

nvd.nist.gov (CVE-2026-4602)

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