CVE-2026-103902 DigiDoc improper signature verification
Attackers can forge digital signatures that appear valid in DigiDoc applications, compromising document integrity and trust.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-103902?
CVE-2026-103902 is a high-severity vulnerability in DigiDoc Android, published on 12 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-347
Which versions are affected by CVE-2026-103902?
How do I fix CVE-2026-103902?
No fix has been published for CVE-2026-103902 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-103902 being exploited?
There is no known exploitation of CVE-2026-103902 in the wild and no public exploit code.
Sources
Also known as GHSA-jjqw-f3cg-gjjw, UBUNTU-CVE-2026-103902.