TI-2026-70916 Aliases CVE-2026-103902 GHSA-jjqw-f3cg-gjjw

DigiDoc software accepts forged digital signatures as valid

LOW 38CWE-347Published 2026-10-12 · Updated 2026-10-15

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Security bypass
Confidentiality · integrity · availability: None · High · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-347.

Summary

DigiDoc 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, and DigiDoc iOS from 2.7.0 before 3.1.0 do not properly verify cryptographic signatures (CWE-347). A remote attacker without privileges or user interaction can create forged digital signatures that the affected software displays as valid.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00147 3rd percentileScored 2026-11-07

Fix Fixed libdigidocpp (DigiDoc): 4.5.0DigiDoc4 (DigiDoc): 4.11.0+2 more products

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
DigiDoc	libdigidocpp	4.0.0 to before 4.5.0	4.5.0	Patch available	CNA
DigiDoc	DigiDoc4	4.6.0 to before 4.11.0	4.11.0	Patch available	CNA
DigiDoc	DigiDoc Android	2.7.0 to before 3.1.0	3.1.0	Patch available	CNA
DigiDoc	DigiDoc iOS	2.7.0 to before 3.1.0	3.1.0	Patch available	CNA

libdigidocpp VendorDigiDoc Affected 4.0.0 to before 4.5.0 Fixed in 4.5.0 Patch available CNA
DigiDoc4 VendorDigiDoc Affected 4.6.0 to before 4.11.0 Fixed in 4.11.0 Patch available CNA
DigiDoc Android VendorDigiDoc Affected 2.7.0 to before 3.1.0 Fixed in 3.1.0 Patch available CNA
DigiDoc iOS VendorDigiDoc Affected 2.7.0 to before 3.1.0 Fixed in 3.1.0 Patch available CNA

Remediation

Upgrade libdigidocpp to 4.5.0, DigiDoc4 to 4.11.0, DigiDoc Android to 3.1.0, and DigiDoc iOS to 3.1.0.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Fix · CNA libdigidocpp (DigiDoc) Fixed in 4.5.0
Fix · CNA DigiDoc4 (DigiDoc) Fixed in 4.11.0
Fix · CNA DigiDoc Android (DigiDoc) Fixed in 3.1.0
Fix · CNA DigiDoc iOS (DigiDoc) Fixed in 3.1.0

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product

Red Hat

Timeline

2026-10-12 Threatist record created from CVE-2026-103902
2026-10-12 Alias added: GHSA-jjqw-f3cg-gjjw
2026-10-13 Affected versions changed · Red Hat
2026-10-13 CVSS score added · Red Hat
2026-10-13 Priority changed: MEDIUM → LOW
2026-10-16 CISA SSVC decision points changed

References

Patch 1

https://github.com/open-eid/libdigidocpp/pull/735

Other 1

https://www.id.ee/en/article/id-tarkvara-uus-versioon-267-on-avalikustatud/

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences