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CVE-2026-103902— DigiDoc improper signature verification

Quick assessment

Affected
DigiDoc libdigidocpp
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

DigiDoc 的 libdigidocpp、DigiDoc4、DigiDoc Android 和 DigiDoc iOS 中存在密码学签名验证不当的安全漏洞。该漏洞允许攻击者创建伪造的数字签名，而这些伪造签名在被影响的 DigiDoc 软件中会被显示为有效。此问题影响以下版本范围： libdigidocpp：4.0.0 至 4.5.0（不含 4.5.0） DigiDoc4：4.6.0 至 4.11.0（不含 4.11.0） DigiDoc Android：2.7.0 至 3.1.0（不含 3.1.0） DigiD

CVSS 7.5 · High EPSS 0.15% · P4

Affected Version Matrix 4

VendorProduct Version RangeStatus
DigiDoc DigiDoc Android 2.7.0< 3.1.0 affected
DigiDoc DigiDoc iOS 2.7.0< 3.1.0 affected
DigiDoc DigiDoc4 4.6.0< 4.11.0 affected
DigiDoc libdigidocpp 4.0.0< 4.5.0 affected
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I. Basic Information for CVE-2026-103902

Vulnerability Information
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Vulnerability Title
DigiDoc improper signature verification
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
DigiDoc libdigidocpp 4.0.0 ~ 4.5.0 -
DigiDoc DigiDoc4 4.6.0 ~ 4.11.0 -
DigiDoc DigiDoc Android 2.7.0 ~ 3.1.0 -
DigiDoc DigiDoc iOS 2.7.0 ~ 3.1.0 -

II. Public POCs for CVE-2026-103902

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-103902

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Patches & Fixes for CVE-2026-103902 (1)

IV. Related Vulnerabilities

Same product: libdigidocpp
Same weakness: CWE-347

V. Comments for CVE-2026-103902

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