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    CVE-2026-4600

    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.

    Published:Mar 23, 2026
    Last Modified:Jun 26, 2026
    EPS:Mar 23, 2026
    EPSS Score:0.00153
    CVSS Score:7.4

    Affected Products

    Vendor
    Jsrsasign Project
    Product
    Jsrsasign
    Vendor
    Kjur
    Product
    Jsrsasign

    Exploits

    https://gist.github.com/Kr0emer/bf15ddc097176e951659a24a8e9002a7https://gist.github.com/Kr0emer/bf15ddc097176e951659a24a8e9002a7

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-463 Padding Oracle Crypto Attack
    CAPEC-475 Signature Spoofing by Improper Validation

    Related CVEs

    CVE-2026-4603 (CVSS 2) — Versions of the package jsrsasign before 11.1.1 are vulnerable to Division by zero due to the RSASetPublic/KEY…
    CVE-2026-4601 (CVSS 8.8) — Versions of the package jsrsasign before 11.1.1 are vulnerable to Missing Cryptographic Step via the KJUR.cryp…
    CVE-2026-4599 (CVSS 9.3) — Versions of the package jsrsasign from 7.0.0 and before 11.1.1 are vulnerable to Incomplete Comparison with Mi…
    CVE-2026-4598 (CVSS 7.7) — Versions of the package jsrsasign before 11.1.1 are vulnerable to Infinite loop via the bnModInverse function …
    CVE-2026-4602 (CVSS 7.7) — Versions of the package jsrsasign before 11.1.1 are vulnerable to Incorrect Conversion between Numeric Types d…
    CVE-2024-21484 (CVSS 7.5) — Versions of the package jsrsasign before 11.0.0 are vulnerable to Observable Discrepancy via the RSA PKCS1.5 o…
    CVE-2022-25898 (CVSS 7.7) — The package jsrsasign before 10.5.25 are vulnerable to Improper Verification of Cryptographic Signature when J…
    CVE-2021-30246 (CVSS 9.1) — In the jsrsasign package through 10.1.13 for Node.js, some invalid RSA PKCS#1 v1.5 signatures are mistakenly r…
    CVE-2020-14966 (CVSS 7.5) — An issue was discovered in the jsrsasign package through 8.0.18 for Node.js. It allows a malleability in ECDSA…
    CVE-2020-14968 (CVSS 9.8) — An issue was discovered in the jsrsasign package before 8.0.17 for Node.js. Its RSASSA-PSS (RSA-PSS) implement…

    References

    https://gist.github.com/Kr0emer/bf15ddc097176e951659a24a8e9002a7
    https://github.com/kjur/jsrsasign/commit/37b4c06b145c7bfd6bc2a6df5d0a12c56b15ef60
    https://github.com/kjur/jsrsasign/pull/646
    https://security.snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-15812268
    https://security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15370940
    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-2026-4600
    https://bugzilla.redhat.com/show_bug.cgi?id=2450208
    https://gist.github.com/Kr0emer/bf15ddc097176e951659a24a8e9002a7
    https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4600.json

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High