Bug 2450208 (CVE-2026-4600)

Summary: CVE-2026-4600 jsrsasign: jsrsasign: Cryptographic signature forgery via malicious DSA domain parameters
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: bdettelb, doconnor
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in jsrsasign. An attacker can exploit improper verification of cryptographic signatures by supplying malicious domain parameters during the Digital Signature Algorithm (DSA) validation process. This allows the attacker to forge DSA signatures or X.509 certificates, which would then be accepted as legitimate, potentially leading to unauthorized access or data manipulation.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-03-23 06:02:04 UTC 
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.