CVE-2026-103902
HIGH 7.5Improper 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.
Severe if exploited (CVSS 7.5), but no known exploitation and low modeled probability. Patch on a normal cadence.
Exploitation likelihood
0.1%chance of exploitation in 30 days · 4th percentile
Impact if exploited
7.5CVSS 3.1 · HIGH
- ConfidentialityNone
- IntegrityHigh
- AvailabilityNone
What an attacker needs
- ✓Access: Reachable over the network — no local access needed
- ✓Privileges: No account or privileges required
- ✓User interaction: No user interaction needed
- ✓Complexity: No special conditions — reliably repeatable
✓ lowers the bar for an attacker · ⚠ raises it
Proof of concept
No public PoC is currently catalogued.
Search for new PoCs
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Tracked sources are checked daily for recent CVEs, including PoCs published after the original disclosure. A later release appears after a tracked source lists it and a refresh succeeds.
Data snapshot:
Weakness (CWE)
- CWE-347: Improper verification of cryptographic signature
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
References and research data (JSON)
Vendor product assessments
All currently supported Red Hat products · known not affected
Vendor assessment for this product only.
Reason: vulnerable code not present
Red Hat · CVE-2026-103902 · Updated 2026-10-13T07:38:23+00:00
All CVSS metrics
- HIGH 7.5 v3.1 · CNA Primary
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N - HIGH 7.5 v3.1 · NVD Secondary
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
References
Patches & mitigations
- https://github.com/open-eid/libdigidocpp/pull/735 CVE record · ENISA · Updated 2026-10-12T10:25:20.361Z
NVD · CVE-2026-103902 · Updated 2026-10-16T20:04:29.760
Advisories
- https://www.id.ee/en/article/id-tarkvara-uus-versioon-267-on-avalikustatud/ CVE record · ENISA · Updated 2026-10-12T10:25:20.361Z
NVD · CVE-2026-103902 · Updated 2026-10-16T20:04:29.760 - https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-103902.json Red Hat · CVE-2026-103902 · Updated 2026-10-13T07:38:23+00:00
- https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-97323 EUVD · EUVD-2026-97323
Technical & other
- https://access.redhat.com/security/cve/CVE-2026-103902 Red Hat · CVE-2026-103902 · Updated 2026-10-13T07:38:23+00:00
- https://www.cve.org/CVERecord?id=CVE-2026-103902 Red Hat · CVE-2026-103902 · Updated 2026-10-13T07:38:23+00:00