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Vulnerability · Published Mar 23, 2026 · Assigned by snyk

CVE-2026-4600

High 7.4

In plain English

A high-severity security flaw in jsrsasign. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 30% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.4High
Exploit odds (30 days)0.4%top 70.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
npmjsrsasign11.1.1GHSA-wvqx-v3f6-w8rh

Affected products (as reported)

VendorProductVersions
n/a jsrsasign 0 – before 11.1.1
n/a org.webjars.npm:jsrsasign 0 – before *

Weakness: CWE-347 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N/E:P

References