CVE-2026-70383: Arbitrary file overwrite vulnerability in DigiDoc4 client

Severity: high (CVSS 8.4 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-20 · updated 2026-10-18
Weakness: CWE-22

Description

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability in Estonian Information System Authority (RIA) DigiDoc4 client. This issue affects DigiDoc4: from 4.0.0 before 4.11.0.

Affected products

Estonian Information System Authority (RIA) DigiDoc4: from 4.0.0 before 4.11.0 — fixed in 4.11.0

How to fix

Upgrade to a fixed version: Estonian Information System Authority (RIA) DigiDoc4 4.11.0. Check the vendor advisory for mitigations.

References

https://github.com/open-eid/DigiDoc4-Client
https://github.com/open-eid/DigiDoc4-Client/pull/1402
https://github.com/open-eid/libdigidocpp/pull/736

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