Bug 2549509 (CVE-2026-103902)

Summary: CVE-2026-103902 libdigidocpp: libdigidocpp: Digital signature forgery via improper signature verification
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: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in libdigidocpp. A remote attacker can create forged digital signatures that are improperly verified and incorrectly displayed as valid. This flaw allows an attacker to bypass signature validation checks and present fraudulent or altered documents as authentic.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2550235    
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Description OSIDB Bzimport 2026-10-12 10:31:27 UTC
Improper verification of cryptographic signature vulnerability in DigiDoc libdigidocpp, DigiDoc DigiDoc4, DigiDoc DigiDoc Android, and DigiDoc DigiDoc iOS. The vulnerability allows an attacker to create forged digital signatures
 that are displayed a valid by affected DigiDoc software.This issue affects libdigidocpp: from 4.0.0 before 4.5.0; DigiDoc4: from 4.6.0 before 4.11.0; DigiDoc Android: from 2.7.0 before 3.1.0; DigiDoc iOS: from 2.7.0 before 3.1.0.