CVE-2026-4600

Description

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.

References

https://security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15370940

https://security.snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-15812268

https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4600.json

https://github.com/kjur/jsrsasign/pull/646

https://github.com/kjur/jsrsasign/commit/37b4c06b145c7bfd6bc2a6df5d0a12c56b15ef60

https://gist.github.com/Kr0emer/bf15ddc097176e951659a24a8e9002a7

https://bugzilla.redhat.com/show_bug.cgi?id=2450208

https://access.redhat.com/security/cve/CVE-2026-4600

https://access.redhat.com/errata/RHSA-2026:6926

https://access.redhat.com/errata/RHSA-2026:6912

https://access.redhat.com/errata/RHSA-2026:6720

https://access.redhat.com/errata/RHSA-2026:6568

https://access.redhat.com/errata/RHSA-2026:19410

https://access.redhat.com/errata/RHSA-2026:19409

https://access.redhat.com/errata/RHSA-2026:19375

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3

CVSS v4

EPSS