---
id: CVE-2026-103902
title: >-
  Improper verification of cryptographic signature vulnerability in DigiDoc
  libdigidocpp, DigiDoc DigiDoc4, DigiDoc DigiDoc Android, and DigiDoc DigiDoc
  iOS
summary: >-
  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 ar…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N'
cwe:
  - CWE-347
vendor: DigiDoc
product: libdigidocpp
affected:
  - libdigidocpp >= 4.0.0 < 4.5.0
  - DigiDoc4 >= 4.6.0 < 4.11.0
  - android >= 2.7.0 < 3.1.0
  - ios >= 2.7.0 < 3.1.0
published: '2026-10-12'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T20:04:29.760'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-103902'
references:
  - url: 'https://github.com/open-eid/libdigidocpp/pull/735'
    label: a6d3dc9e-0591-4a13-bce7-0f5b31ff6158
  - url: >-
      https://www.id.ee/en/article/id-tarkvara-uus-versioon-267-on-avalikustatud/
    label: a6d3dc9e-0591-4a13-bce7-0f5b31ff6158
tags:
  - nvd
  - cve.org
epss: 0.00147
epssPercentile: 0.0394
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-10-15T18:00:40.710010Z'
ingestedAt: '2026-10-12T14:50:34.103Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.