Vulnerability in Jsrsasign Project
CVE-2026-4601
Versions of the package jsrsasign before 11.1.1 are vulnerable to Missing Cryptographic Step via the KJUR.crypto.DSA.signWithMessageHash process in the DSA signing implementation. An attacker can recover the private key by forcing r or s to be zero, so the library emits an invalid signature without retrying, and then solves for x from the resulting signature.
EPSS: 0.003 (22.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.7 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N.
Affected products
- Jsrsasign_project Jsrsasign
- Kjur Jsrsasign
- N/a Jsrsasign — versions 0
- N/a Org.webjars.npm:jsrsasign — versions 0
Weakness classification (CWE)
References
- report@snyk.io (Third Party Advisory)
- report@snyk.io (Exploit, Third Party Advisory, Mitigation)
- report@snyk.io (Issue Tracking)
- report@snyk.io (Patch)
- 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
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Frequently asked questions
- What is CVE-2026-4601?
- CVE-2026-4601 is a high-severity vulnerability in Jsrsasign Project, classified under Missing Cryptographic Step. CVSS score: 8.7/10. Published 2026-03-23.
- How severe is CVE-2026-4601?
- High severity. CVSS v3 base score is 8.7 out of 10.