What’s Vulnerable › Vulnerabilities

CVE-2026-4598

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-03-23 · updated 2026-09-10
• Weakness: CWE-835

Description

Versions of the package jsrsasign before 11.1.1 are vulnerable to Infinite loop via the bnModInverse function in ext/jsbn2.js when the BigInteger.modInverse implementation receives zero or negative inputs, allowing an attacker to hang the process permanently by supplying such crafted values (e.g., modInverse(0, m) or modInverse(-1, m)).

Affected products

• jsrsasign: before 11.1.1 — fixed in 11.1.1

How to fix

Upgrade to a fixed version: jsrsasign 11.1.1. Check the vendor advisory for mitigations.

References

• https://gist.github.com/Kr0emer/a1bf5cd4547cc630d2dcc5e761de8264
• https://github.com/kjur/jsrsasign/commit/ca5b027240287a1e71fe63019fc4400332594323
• https://github.com/kjur/jsrsasign/pull/648
• https://security.snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-15812263
• https://security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15370938
• https://access.redhat.com/errata/RHSA-2026:19375
• https://access.redhat.com/errata/RHSA-2026:19409
• https://access.redhat.com/errata/RHSA-2026:19410
• https://access.redhat.com/errata/RHSA-2026:22840
• https://access.redhat.com/errata/RHSA-2026:23361
• https://access.redhat.com/errata/RHSA-2026:6568
• https://access.redhat.com/errata/RHSA-2026:6720

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