jsrsasign up to 11.1.0 ext/jsbn2.js bnModInverse infinite loop

CVSS Meta Temp Score
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CTI Interest Score
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6.3$0-$5k0.00

Summaryinfo

A vulnerability categorized as problematic has been discovered in jsrsasign up to 11.1.0. This affects the function bnModInverse of the file ext/jsbn2.js. Executing a manipulation can lead to infinite loop. This vulnerability is handled as CVE-2026-4598. The attack can be executed remotely. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in jsrsasign up to 11.1.0. This vulnerability affects the function bnModInverse of the file ext/jsbn2.js. The manipulation with an unknown input leads to a infinite loop vulnerability. The CWE definition for the vulnerability is CWE-835. The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop. As an impact it is known to affect availability. CVE summarizes:

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)).

The advisory is available at security.snyk.io. This vulnerability was named CVE-2026-4598 since 03/22/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1499 by the MITRE ATT&CK project.

It is declared as proof-of-concept.

Upgrading to version 11.1.1 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-14371). Once again VulDB remains the best source for vulnerability data.

Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.3

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 7.5
CNA Vector (snyk): 🔒

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Infinite loop
CWE: CWE-835 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Proof-of-Concept

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: jsrsasign 11.1.1

Timelineinfo

03/22/2026 CVE reserved
03/23/2026 +1 days Advisory disclosed
03/23/2026 +0 days VulDB entry created
03/23/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: SNYK-JS-JSRSASIGN-15370938
Status: Confirmed

CVE: CVE-2026-4598 (🔒)
GCVE (CVE): GCVE-0-2026-4598
GCVE (VulDB): GCVE-100-352486
EUVD: 🔒

Entryinfo

Created: 03/23/2026 07:14
Updated: 03/23/2026 11:36
Changes: 03/23/2026 07:14 (78), 03/23/2026 11:36 (1)
Complete: 🔍
Cache ID: 216:903:103

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