Vulnerability in Jsrsasign Project
CVE-2026-4599
Versions of the package jsrsasign from 7.0.0 and before 11.1.1 are vulnerable to Incomplete Comparison with Missing Factors via the getRandomBigIntegerZeroToMax and getRandomBigIntegerMinToMax functions in src/crypto-1.1.js; an attacker can recover the private key by exploiting the incorrect compareTo checks that accept out-of-range candidates and thus bias DSA nonces during signature generation.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.008 (56.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 56th percentile — 56.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.008 · change: +0.003
Affected products
- Jsrsasign Project
- Kjur Jsrsasign
- Jsrsasign — versions 7.0.0
- Org.webjars.npm:jsrsasign — versions 8.0.12
Weakness classification (CWE)
References
- security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15370939 (Third Party Advisory)
- gist.github.com/Kr0emer/081681818b51605c91945126d74b4f20 (Exploit, Third Party Advisory, Mitigation)
- github.com/kjur/jsrsasign/pull/647 (Issue Tracking)
- github.com/kjur/jsrsasign/commit/ee4b013478366cb16cea9a4bdfb218b6077f83b1 (Patch)
- security.snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-15812264
- 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-2026-4599?
- CVE-2026-4599 is a critical-severity vulnerability in Jsrsasign Project, classified under CWE-1023. CVSS score: 9.1/10. Published 2026-03-23.
- How severe is CVE-2026-4599?
- Critical severity. CVSS v3 base score is 9.1 out of 10.