CVE-2026-4598
Medium
Elevated severity or exploit probability.
CVSS base
7.5
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS — probability of exploitation (30 days)
0.5%
44.5th percentile
CISA KEV
Not listed
Weakness / dates
CWE-1287
Published 2026-03-23 · modified 2026-09-10
CVSS breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
| Attack Vector | N | Network |
| Attack Complexity | L | Low |
| Privileges Required | N | None |
| User Interaction | N | None |
| Scope | U | Unchanged |
| Confidentiality | N | None |
| Integrity | N | None |
| Availability | H | High |
Timeline
- 2026-03-23 — Published (NVD)
- 2026-09-10 — Last modified (NVD)
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
References
- exploit 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
- https://access.redhat.com/security/cve/CVE-2026-4598
- https://bugzilla.redhat.com/show_bug.cgi?id=2450210
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4598.json