CVE-2026-59112

Signature validation vulnerability affecting DigiDoc applications

MEDIUM

4.4

CVSS Score

Published: August 10, 2026 at 01:57 PM UTC

Updated: September 1, 2026 at 09:21 PM UTC

3 products affected across 1 vendorDigiDoc4DigiDocLibdigidocpp

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Severity

MEDIUM4.4

Exploit prediction

EPSS 0.1%

SSVC

PoC

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

DigiDoc · Estonian Information System Authority Ria

60%

2.7.0 ≤ v < 2.7.22.8.0 ≤ v < 2.8.12.7.0 2.8.0

Affected range stops below 2.7.2, so it looks safe — our inference, not a vendor statement

Affected range stops below 2.8.1, so it looks safe — our inference, not a vendor statement

DigiDoc4 · Estonian Information System Authority Ria

60%

4.7.0 ≤ v < 4.8.24.7.0

Affected range stops below 4.8.2, so it looks safe — our inference, not a vendor statement

Libdigidocpp · Estonian Information System Authority Ria

60%

4.1.0 ≤ v < 4.2.14.1.0

Affected range stops below 4.2.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

Patch

Source: cverecord

https://github.com/open-eid/libdigidocpp/pull/690

Vendor Advisory

Source: cverecord

https://www.id.ee/en/article/ria-soovitab-kasutajatel-uuendada-id-tarkvara-eng/

US Government Resource

Source: cverecord

https://www.ria.ee/blogi/digidoc-rakendustes-esinenud-turvanorkus-mis-juhtus-ja-kuidas-see-parandati

SSVC — Action Prioritization

SSVCPoCNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

4.4MEDIUMENISA

Vector?

Quick Info

StatusDEFERRED

CWE

CWE-347CWE-754

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