PT-2026-27054 · Jsrsasign · Jsrsasign

Kr0Emer · CVE-2026-4598 · Published 2026-03-23 · Updated 2026-07-20

Positive Technologies (AI Summary)

CVSS v4.0

7.7

High

Base vector

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

Name of the Vulnerable Software and Affected Versions jsrsasign versions prior to 11.1.1

Description An infinite loop occurs via the bnModInverse() function in ext/jsbn2.js when the BigInteger.modInverse implementation receives zero or negative inputs. This allows an attacker to permanently hang the process by supplying crafted values, such as modInverse(0, m) or modInverse(-1, m).

Recommendations Update to version 11.1.1 or later.

Exploit

Fix

Infinite Loop

Weakness Enumeration

CWE-1287

CWE-835

Related Identifiers

CVE-2026-4598

GHSA-8G7P-JF3G-GXCP

Affected Products

Jsrsasign

References · 27

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/4xxx/CVE-2026-4598.json · Exploit
• 🔥 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://access.redhat.com/errata/RHSA-2026:6720 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-8g7p-jf3g-gxcp · Vendor Advisory
• https://access.redhat.com/errata/RHSA-2026:19409 · Vendor Advisory
• https://access.redhat.com/errata/RHSA-2026:6568 · Vendor Advisory
• https://access.redhat.com/errata/RHSA-2026:19410 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-4598 · Vendor Advisory
• https://access.redhat.com/errata/RHSA-2026:22840 · Vendor Advisory
• https://access.redhat.com/errata/RHSA-2026:19375 · Vendor Advisory
• https://access.redhat.com/errata/RHSA-2026:23361 · Vendor Advisory
• https://github.com/kjur/jsrsasign · Note
• https://github.com/kjur/jsrsasign/pull/648 · Note