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    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:Mar 23, 2026
    Last Modified:Jun 25, 2026
    EPS:Mar 23, 2026
    EPSS Score:0.004
    CVSS Score:7.5

    Affected Products

    Vendor
    Jsrsasign Project
    Product
    Jsrsasign
    Vendor
    Kjur
    Product
    Jsrsasign

    Exploits

    https://gist.github.com/Kr0emer/7ecd2be7d17419e4677315ef3758faf5

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    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-2026-4600 (CVSS 8.1) — Versions of the package jsrsasign before 11.1.1 are vulnerable to Improper Verification of Cryptographic Signa…
    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/7ecd2be7d17419e4677315ef3758faf5
    https://github.com/kjur/jsrsasign/commit/5ea1c32bb2aa894b4bd29849839afe4f98728195
    https://github.com/kjur/jsrsasign/pull/650
    https://security.snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-15812274
    https://security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15371175
    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-2026-4602
    https://bugzilla.redhat.com/show_bug.cgi?id=2450206
    https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4602.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