Vulnerability in Jsrsasign Project
CVE-2026-4602
Versions of the package jsrsasign before 11.1.1 are vulnerable to Incorrect Conversion between Numeric Types due to handling negative exponents in ext/jsbn2.js. An attacker can force the computation of incorrect modular inverses and break signature verification by calling modPow with a negative exponent.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.009 (59.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 60th percentile — 59.6% 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: 0.009 · change: +0.004
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-15371175 (Third Party Advisory)
- gist.github.com/Kr0emer/7ecd2be7d17419e4677315ef3758faf5 (Exploit, Third Party Advisory, Mitigation)
- github.com/kjur/jsrsasign/pull/650 (Issue Tracking)
- github.com/kjur/jsrsasign/commit/5ea1c32bb2aa894b4bd29849839afe4f98728195 (Patch)
- security.snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-15812274
- 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-2026-4602?
- CVE-2026-4602 is a high-severity vulnerability in Jsrsasign Project, classified under Incorrect Conversion between Numeric Types. CVSS score: 7.5/10. Published 2026-03-23.
- How severe is CVE-2026-4602?
- High severity. CVSS v3 base score is 7.5 out of 10.