CVE-2026-4600CRITICAL 9.1EPSS p4.8%

CVE-2026-4600CVE-2026-4600

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.

Scoring

CVSS 3.19.1 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
EPSS0.15% probability of exploitation · percentile 4.8% · 2026-06-19T12:03:05Z
Published2026-03-23
Last modified2026-04-29

Underlying weaknesses· 1

CWE-347

References

  1. https://gist.github.com/Kr0emer/bf15ddc097176e951659a24a8e9002a7
  2. https://github.com/kjur/jsrsasign/commit/37b4c06b145c7bfd6bc2a6df5d0a12c56b15ef60
  3. https://github.com/kjur/jsrsasign/pull/646
  4. https://security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15370940
  5. https://gist.github.com/Kr0emer/bf15ddc097176e951659a24a8e9002a7

1

TypeTargetConfidenceTier
WeaknessImproper Verification of Cryptographic Signaturecwe-3470%live

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.