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OpenAdvisories
High · 7.5 CVE-2026-103902 EUVD-2026-97323GHSA-jjqw-f3cg-gjjw

DigiDoc improper signature verification

Published Oct 12, 2026 · Updated Oct 15, 2026 · Assigned by ENISA

Description

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.

Affected products

VendorProductAffectedFixed
DigiDoc libdigidocpp 4.0.0 – < 4.5.0 4.5.0
DigiDoc DigiDoc4 4.6.0 – < 4.11.0 4.11.0
DigiDoc DigiDoc Android 2.7.0 – < 3.1.0 3.1.0
DigiDoc DigiDoc iOS 2.7.0 – < 3.1.0 3.1.0

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

ReleasePackageFixed inAdvisory
Ubuntu 16.04 LTS libdigidocpp No fix yet —

References