Vulnerability in Jsrsasign Project
CVE-2026-4600
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.
EPSS: 0.002 (13.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N.
Affected products
- Jsrsasign_project Jsrsasign
- Kjur Jsrsasign
- N/a Jsrsasign — versions 0
- N/a Org.webjars.npm:jsrsasign — versions 0
Weakness classification (CWE)
References
- report@snyk.io (Third Party Advisory)
- report@snyk.io (Exploit, Third Party Advisory, Mitigation)
- report@snyk.io (Issue Tracking)
- report@snyk.io (Patch)
- report@snyk.io
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Frequently asked questions
- What is CVE-2026-4600?
- CVE-2026-4600 is a high-severity vulnerability in Jsrsasign Project, classified under Improper Verification of Cryptographic Signature. CVSS score: 7.4/10. Published 2026-03-23.
- How severe is CVE-2026-4600?
- High severity. CVSS v3 base score is 7.4 out of 10.