jsrsasign up to 11.1.0 ext/jsbn2.js numeric conversion

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.3$0-$5k0.00

Summaryinfo

A vulnerability classified as problematic has been found in jsrsasign up to 11.1.0. The impacted element is an unknown function of the file ext/jsbn2.js. Performing a manipulation results in numeric conversion. This vulnerability is identified as CVE-2026-4602. The attack can be initiated remotely. There is not any exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in jsrsasign up to 11.1.0. It has been classified as problematic. This affects some unknown processing of the file ext/jsbn2.js. The manipulation with an unknown input leads to a numeric conversion vulnerability. CWE is classifying the issue as CWE-681. When converting from one data type to another, such as long to integer, data can be omitted or translated in a way that produces unexpected values. If the resulting values are used in a sensitive context, then dangerous behaviors may occur. This is going to have an impact on availability. The summary by CVE is:

Versions of the package jsrsasign before 11.1.1 are vulnerable to Incorrect Conversion between Numeric Types due to handling negative exponents in ext/jsbn2.js. An attacker can force the computation of incorrect modular inverses and break signature verification by calling modPow with a negative exponent.

It is possible to read the advisory at security.snyk.io. This vulnerability is uniquely identified as CVE-2026-4602 since 03/22/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit.

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-2026-14379). Statistical analysis made it clear that VulDB provides the best quality 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: Numeric conversion
CWE: CWE-681 / CWE-704
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-15371175
Status: Confirmed

CVE: CVE-2026-4602 (🔒)
GCVE (CVE): GCVE-0-2026-4602
GCVE (VulDB): GCVE-100-352491
EUVD: 🔒

Entryinfo

Created: 03/23/2026 07:19
Updated: 03/23/2026 10:27
Changes: 03/23/2026 07:19 (76), 03/23/2026 10:27 (1)
Complete: 🔍
Cache ID: 216:FB5:103

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