VDB
CVE-2026-4600
CVE-2026-4600
PUBLISHED
CVSS 8.100000381469727 HIGH
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 0.32% · 22.5th percentile
Risk Scores
CVSS 4.0
8.100000381469727
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS Score
0.32%
22.5th percentile
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| n/a | jsrsasign | 0, 0, 0 |
| npm | jsrsasign | 0 |
| jsrsasign_project | jsrsasign | 0, 0, 0 |
Timeline
- Mar 23, 2026 CVE Published
- Mar 23, 2026 EPSS Score
- Mar 23, 2026 PoC Published
- Mar 24, 2026 EPSS Score
- Mar 24, 2026 PoC Published
- Mar 25, 2026 EPSS Score
- Mar 25, 2026 Coalition ESS Score
- Mar 26, 2026 EPSS Score
- Mar 26, 2026 Coalition ESS Score
- Mar 27, 2026 Coalition ESS Score
- Mar 29, 2026 Security Advisory
- May 18, 2026 EPSS Score
References
- https://github.com/kjur/jsrsasign/commit/37b4c06b145c7bfd6bc2a6df5d0a12c56b15ef60 url
- https://github.com/kjur/jsrsasign/pull/646 issue
- https://security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15370940 advisory
- https://nvd.nist.gov/vuln/detail/CVE-2026-4600 advisory
- https://gist.github.com/Kr0emer/bf15ddc097176e951659a24a8e9002a7 url
- https://github.com/kjur/jsrsasign package