CVE-2026-59112
Received Received - Intake

Improper Signature Verification in DigiDoc Applications

Publication date: 2026-08-10

Last updated on: 2026-08-10

Assigner: ENISA

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.

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Meta Information

Published
2026-08-10
Last Modified
2026-08-10
Generated
2026-08-10
AI Q&A
2026-08-10
EPSS Evaluated
N/A
NVD
CVE-2026-59112
EUVD
EUVD-2026-55632

Affected Vendors & Products

Showing 4 associated CPEs
Vendor Product Version / Range
estonia_information_system_authority libdigidocpp From 4.1.0 (inc) to 4.2.1 (exc)
estonia_information_system_authority digidoc4 From 4.7.0 (inc) to 4.8.2 (exc)
estonia_information_system_authority digidoc_on_android From 2.7.0 (inc) to 2.7.2 (exc)
estonia_information_system_authority digidoc_on_ios From 2.8.0 (inc) to 2.8.1 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-754 The product does not check or incorrectly checks for unusual or exceptional conditions that are not expected to occur frequently during day to day operation of the product.
CWE-347 The product does not verify, or incorrectly verifies, the cryptographic signature for data.

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Executive Summary

This vulnerability involves improper verification of cryptographic signatures and improper handling of unusual or exceptional conditions in several Estonian digital signature applications. It affects libdigidocpp versions before 4.2.1, DigiDoc4 versions before 4.8.2, DigiDoc on Android versions before 2.7.2, and DigiDoc on iOS versions before 2.8.1.

Impact Analysis

An attacker could exploit this to bypass signature verification, potentially allowing forged or tampered documents to be accepted as valid. This could lead to unauthorized transactions, legal disputes, or data integrity issues if using affected versions of these applications.

Mitigation Strategies

Update affected software to the latest patched versions: libdigidocpp to 4.2.1 or later, DigiDoc4 to 4.8.2 or later, DigiDoc on Android to 2.7.2 or later, and DigiDoc on iOS to 2.8.1 or later.

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