CVE-2026-4600: Improper Verification of Cryptographic Signature in jsrsasign
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.
AI Analysis
Technical Summary
CVE-2026-4600 affects jsrsasign versions prior to 11.1.1 by allowing improper verification of cryptographic signatures due to insufficient validation of DSA domain parameters in KJUR.crypto.DSA.setPublic and related X.509 verification flows. Attackers can supply malicious domain parameters (e.g., g=1, y=1, r=1) that cause the verification equation to always succeed regardless of the hash, enabling forgery of DSA signatures and X.509 certificates. This vulnerability is tracked under CWE-347 (Improper Verification of Cryptographic Signature).
Potential Impact
An attacker can forge DSA signatures or X.509 certificates that are accepted as valid by the vulnerable verification functions. This undermines the integrity and authenticity guarantees of cryptographic signatures, potentially allowing unauthorized code execution, privilege escalation, or bypass of security controls relying on signature validation.
Mitigation Recommendations
A fix is available in jsrsasign version 11.1.1 and later. Users should upgrade to version 11.1.1 or newer to remediate this vulnerability. There is no indication that this vulnerability affects cloud services, so remediation is the responsibility of users deploying the vulnerable versions. Check the vendor advisories from Red Hat for additional guidance and updates.
CVE-2026-4600: Improper Verification of Cryptographic Signature in jsrsasign
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.
CVSS v4.0
Score 9.1critical
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-4600 affects jsrsasign versions prior to 11.1.1 by allowing improper verification of cryptographic signatures due to insufficient validation of DSA domain parameters in KJUR.crypto.DSA.setPublic and related X.509 verification flows. Attackers can supply malicious domain parameters (e.g., g=1, y=1, r=1) that cause the verification equation to always succeed regardless of the hash, enabling forgery of DSA signatures and X.509 certificates. This vulnerability is tracked under CWE-347 (Improper Verification of Cryptographic Signature).
Potential Impact
An attacker can forge DSA signatures or X.509 certificates that are accepted as valid by the vulnerable verification functions. This undermines the integrity and authenticity guarantees of cryptographic signatures, potentially allowing unauthorized code execution, privilege escalation, or bypass of security controls relying on signature validation.
Mitigation Recommendations
A fix is available in jsrsasign version 11.1.1 and later. Users should upgrade to version 11.1.1 or newer to remediate this vulnerability. There is no indication that this vulnerability affects cloud services, so remediation is the responsibility of users deploying the vulnerable versions. Check the vendor advisories from Red Hat for additional guidance and updates.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- snyk
- Date Reserved
- 2026-03-22T16:26:03.357Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Vendor Advisory Urls
- [{"url":"https://access.redhat.com/security/cve/CVE-2026-4600","vendor":"Red Hat"},{"url":"https://access.redhat.com/errata/RHSA-2026:19409","vendor":"Red Hat"},{"url":"https://access.redhat.com/errata/RHSA-2026:19410","vendor":"Red Hat"},{"url":"https://access.redhat.com/errata/RHSA-2026:6720","vendor":"Red Hat"},{"url":"https://access.redhat.com/errata/RHSA-2026:6568","vendor":"Red Hat"},{"url":"https://access.redhat.com/errata/RHSA-2026:19375","vendor":"Red Hat"},{"url":"https://access.redhat.com/errata/RHSA-2026:6912","vendor":"Red Hat"},{"url":"https://access.redhat.com/errata/RHSA-2026:6926","vendor":"Red Hat"}]
Threat ID: 69c0d39df4197a8e3b12da49
Added to database: 03/23/2026, 05:46:05 UTC
Last enriched: 07/25/2026, 22:56:10 UTC
Last updated: 07/31/2026, 21:26:48 UTC
Views: 160
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