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CVE-2026-59112— Signature validation vulnerability affecting DigiDoc applications

Quick assessment

Affected
Estonian Information System Authority (RIA) 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.

Open Electronic Identity libdigidocpp是Open Electronic Identity组织的一个处理数字签名的软件库。 Open Electronic Identity libdigidocpp 4.1.0至4.2.1之前版本、DigiDoc4 4.7.0至4.8.2之前版本、DigiDoc on Android 2.7.0至2.7.2之前版本和DigiDoc on iOS 2.8.0至2.8.1之前版本存在安全漏洞，该漏洞源于加密签名验证不当和异常条件检查不当，可能

CVSS 4.4 · Medium EPSS 0.12% · P2

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 4

VendorProduct Version RangeStatus
Estonian Information System Authority (RIA) DigiDoc 2.7.0< 2.7.2 affected
2.8.0< 2.8.1 affected
Estonian Information System Authority (RIA) DigiDoc4 4.7.0< 4.8.2 affected
Estonian Information System Authority (RIA) libdigidocpp 4.1.0< 4.2.1 affected
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I. Basic Information for CVE-2026-59112

Vulnerability Information
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Vulnerability Title
Signature validation vulnerability affecting DigiDoc applications
Source: CVE Program / CVE List V5
Vulnerability Description
Improper verification of cryptographic signature and Improper Check for Unusual or Exceptional Conditions vulnerability in Estonian Information System Authority (RIA) libdigidocpp, DigiDoc4, DigiDoc on Android, and DigiDoc on iOS. This issue affects libdigidocpp: from 4.1.0 before 4.2.1; DigiDoc4: from 4.7.0 before 4.8.2; DigiDoc on Android: from 2.7.0 before 2.7.2; DigiDoc on iOS: from 2.8.0 before 2.8.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P
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
Vulnerability Title
Open Electronic Identity libdigidocpp 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Open Electronic Identity libdigidocpp是Open Electronic Identity组织的一个处理数字签名的软件库。 Open Electronic Identity libdigidocpp 4.1.0至4.2.1之前版本、DigiDoc4 4.7.0至4.8.2之前版本、DigiDoc on Android 2.7.0至2.7.2之前版本和DigiDoc on iOS 2.8.0至2.8.1之前版本存在安全漏洞，该漏洞源于加密签名验证不当和异常条件检查不当，可能
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Estonian Information System Authority (RIA) libdigidocpp 4.1.0 ~ 4.2.1 -
Estonian Information System Authority (RIA) DigiDoc4 4.7.0 ~ 4.8.2 -
Estonian Information System Authority (RIA) DigiDoc 2.7.0 ~ 2.7.2 -
Estonian Information System Authority (RIA) DigiDoc 2.8.0 ~ 2.8.1 -

II. Public POCs for CVE-2026-59112

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III. Intelligence Information for CVE-2026-59112

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Patches & Fixes for CVE-2026-59112 (1)

Vendor Advisories for CVE-2026-59112 (2)

IV. Related Vulnerabilities

Same vendor: Estonian Information System Authority (RIA)
Same weakness: CWE-347

V. Comments for CVE-2026-59112

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