What is CVE-2026-103902?

CVE-2026-103902 is a high-severity vulnerability in Digidoc Digidoc4, classified under Improper Verification of Cryptographic Signature. CVSS score: 7.5/10. Published 2026-10-12.

How severe is CVE-2026-103902?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Digidoc Digidoc4

CVE-2026-103902

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.

Published 2026-10-12.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Weakness classification (CWE)

CWE-347 — Improper Verification of Cryptographic Signature

References

a6d3dc9e-0591-4a13-bce7-0f5b31ff6158 (patch)
a6d3dc9e-0591-4a13-bce7-0f5b31ff6158 (government-resource)

Frequently asked questions

What is CVE-2026-103902?: CVE-2026-103902 is a high-severity vulnerability in Digidoc Digidoc4, classified under Improper Verification of Cryptographic Signature. CVSS score: 7.5/10. Published 2026-10-12.
How severe is CVE-2026-103902?: High severity. CVSS v3 base score is 7.5 out of 10.