HOMEVULNERABILITIESCVE-2026-4602
HIGH

CVE-2026-4602

CWE-681Published: March 23, 2026· Updated: Mar 23, 2026

7.5
CVSS v3.1
EPSS:0.04%probability of exploitation in 30 daysPercentile:11.4th

Official Description

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.

NVD Source

Technical Analysis

CVE-2026-4602 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

jsrsasign_project1 product
jsrsasign
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/kjur/jsrsasign/commit/5ea1c32bb2aa894b4bd29849839afe4f98728195
ADVISORYhttps://gist.github.com/Kr0emer/7ecd2be7d17419e4677315ef3758faf5
ADVISORYhttps://security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15371175

All References (4)

→
https://gist.github.com/Kr0emer/7ecd2be7d17419e4677315ef3758faf5Exploit · Mitigation · Third Party Advisory
→
https://github.com/kjur/jsrsasign/commit/5ea1c32bb2aa894b4bd29849839afe4f98728195Patch
→
https://github.com/kjur/jsrsasign/pull/650Issue Tracking
→
https://security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15371175Third Party Advisory

Quick Facts

CVE IDCVE-2026-4602
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-681
CISA KEVNo
EPSS (30d)0.04%
Affected1 vendor
PublishedMar 23, 2026

Related CVEs (CWE-681)

CVE-2026-24192
7.8
CVE-2026-24174
7.5
CVE-2026-34548
6.2
CVE-2026-34550
6.2
CVE-2026-34610
5.9
CVE-2026-9143
5.3

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-4602 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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