CVSS 4.0
8.1 highCVSS: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:PCVE-2026-4600
High (8.1) in kjur jsrsasign. EPSS 0.4% chance of exploitation in the next 30 days. Fixed in jsrsasign 11.1.1.
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.
Severity
CVSS 3.1
9.1 criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N- EPSS
- 0.4% chance of exploitation in the next 30 days; higher than 29% of CVEs (scores of 2026-10-31)
- CWE
- CWE-347
- Published
- Modified
- Record from
- the NVD, synced
Affected
- kjur:jsrsasign
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-wvqx-v3f6-w8rh | npm | jsrsasign | <11.1.1 | 11.1.1 |
References
- https://gist.github.com/Kr0emer/bf15ddc097176e951659a24a8e9002a7
- https://github.com/kjur/jsrsasign/commit/37b4c06b145c7bfd6bc2a6df5d0a12c56b15ef60
- https://github.com/kjur/jsrsasign/pull/646
- https://security.snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-15812268
- https://security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15370940