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.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.003 (25.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 25th percentile — 25.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001
Affected products
- Jsrsasign Project
- Kjur Jsrsasign
- Jsrsasign — versions 0
- Org.webjars.npm:jsrsasign — versions 0
Weakness classification (CWE)
References
- security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15370940 (Third Party Advisory)
- gist.github.com/Kr0emer/bf15ddc097176e951659a24a8e9002a7 (Exploit, Third Party Advisory, Mitigation)
- github.com/kjur/jsrsasign/pull/646 (Issue Tracking)
- github.com/kjur/jsrsasign/commit/37b4c06b145c7bfd6bc2a6df5d0a12c56b15ef60 (Patch)
- security.snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-15812268
- 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.