kjur/jsrsasign · Security
jsrsasign: Incomplete Comparison Allows DSA Private Key Recovery via Biased Nonce Generation
- GHSA ID
- GHSA-5jx8-q4cp-rhh6
- CVE ID
- CVE-2026-4599
- Severity
- critical
- Published
- Updated
- CVSS
- 9.1 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
- CVSS v3
- 9.1 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
- CVSS v4
- 9.3 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Description
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.
CWEs
- CWE-338 · Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)
- CWE-1023 · Incomplete Comparison with Missing Factors
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-4599 ↗
- https://github.com/kjur/jsrsasign/pull/647 ↗
- https://github.com/kjur/jsrsasign/commit/ee4b013478366cb16cea9a4bdfb218b6077f83b1 ↗
- https://gist.github.com/Kr0emer/081681818b51605c91945126d74b4f20 ↗
- https://security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15370939 ↗
- https://access.redhat.com/errata/RHSA-2026:19375 ↗
- https://access.redhat.com/errata/RHSA-2026:19409 ↗
- https://access.redhat.com/errata/RHSA-2026:19410 ↗
- https://access.redhat.com/errata/RHSA-2026:6568 ↗
- https://access.redhat.com/errata/RHSA-2026:6720 ↗
- https://access.redhat.com/errata/RHSA-2026:6912 ↗
- https://access.redhat.com/errata/RHSA-2026:6926 ↗
- https://access.redhat.com/security/cve/CVE-2026-4599 ↗
- https://bugzilla.redhat.com/show_bug.cgi?id=2450207 ↗
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4599.json ↗
- https://security.snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-15812264 ↗
- https://github.com/advisories/GHSA-5jx8-q4cp-rhh6 ↗