PT-2026-27054 · Jsrsasign · Jsrsasign

Kr0Emer · Published 2026-03-23 · Updated 2026-03-23 · CVE-2026-4598

Mitre

CVSS v3.1

7.5

High

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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)).

Exploit

Fix

Infinite Loop

Weakness Enumeration

CWE-835

Related Identifiers

CVE-2026-4598

Affected Products

Jsrsasign

References · 7

• 🔥 https://gist.github.com/Kr0emer/a1bf5cd4547cc630d2dcc5e761de8264 · Exploit
• https://github.com/kjur/jsrsasign/commit/ca5b027240287a1e71fe63019fc4400332594323 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-4598 · Security Note
• https://github.com/kjur/jsrsasign/pull/648 · Note
• https://security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15370938 · Note
• https://twitter.com/VulmonFeeds/status/2035983706645573683 · Twitter Post
• https://twitter.com/CVEnew/status/2035992478516457790 · Twitter Post