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CVE-2026-4600

Kjur Jsrsasign vulnerability

7.4 HIGHPublic exploitEPSS 0.32%
  1. Published23 Mar 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityHigh
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected products

Kjur Jsrsasign< 11.1.1

Remediation

Fixed in
Kjur Jsrsasign≥ 11.1.1

References

and 5 more references

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Frequently asked

Is CVE-2026-4600 being actively exploited?

CVE-2026-4600 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.32%.

How severe is CVE-2026-4600?

CVE-2026-4600 has a CVSS 3.1 base score of 7.4, rated high. EPSS estimates a 0.32% probability of exploitation.

Which products are affected by CVE-2026-4600?

Affected products include Kjur Jsrsasign.

How do I fix CVE-2026-4600?

Upgrade affected software to a fixed version, for example Kjur Jsrsasign 11.1.1 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-4600 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.