HOMEVULNERABILITIESCVE-2026-4600
CRITICAL

CVE-2026-4600

CWE-347Published: March 23, 2026· Updated: Mar 23, 2026

9.1
CVSS v3.1
EPSS:0.01%probability of exploitation in 30 daysPercentile:2.0th

Official Description

Versions of the package jsrsasign before 11.1.1 are vulnerable to Improper Verification of Cryptographic Signature via the DSA domain-parameter validation in KJUR.crypto.DSA.setPublic (and the related DSA/X509 verification flow in src/dsa-2.0.js). An attacker can forge DSA signatures or X.509 certificates that X509.verifySignature() accepts by supplying malicious domain parameters such as g=1, y=1, and a fixed r=1, which make the verification equation true for any hash.

NVD Source

Technical Analysis

CVE-2026-4600 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 complete confidentiality breach (data exposure), full integrity compromise (data manipulation), with a CVSS base score of 9.1.

CVSS v3.1 Vector Breakdown

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

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/37b4c06b145c7bfd6bc2a6df5d0a12c56b15ef60
ADVISORYhttps://gist.github.com/Kr0emer/bf15ddc097176e951659a24a8e9002a7
ADVISORYhttps://security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15370940
ADVISORYhttps://gist.github.com/Kr0emer/bf15ddc097176e951659a24a8e9002a7

All References (5)

→
https://gist.github.com/Kr0emer/bf15ddc097176e951659a24a8e9002a7Exploit · Mitigation · Third Party Advisory
→
https://github.com/kjur/jsrsasign/commit/37b4c06b145c7bfd6bc2a6df5d0a12c56b15ef60Patch
→
https://github.com/kjur/jsrsasign/pull/646Issue Tracking
→
https://security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15370940Third Party Advisory
→
https://gist.github.com/Kr0emer/bf15ddc097176e951659a24a8e9002a7Exploit · Mitigation · Third Party Advisory

Quick Facts

CVE IDCVE-2026-4600
CVSS Score9.1 / 10
SeverityCRITICAL
WeaknessCWE-347
CISA KEVNo
EPSS (30d)0.01%
Affected1 vendor
PublishedMar 23, 2026

Related CVEs (CWE-347)

CVE-2026-48558
KEV10.0
CVE-2026-44748
9.9
CVE-2026-32974
9.8
CVE-2026-6911
9.8
CVE-2026-28802
9.8
CVE-2026-58426
9.6

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-4600 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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