CVE-2026-70383

Arbitrary file overwrite via archive path traversal

Published Aug 20, 2026 · Updated Aug 20, 2026

Path traversal in RIA DigiDoc4 from 4.0.0 before 4.11.0 allows attackers to overwrite local files via crafted ASiC entry names. When DigiDoc4 opens container contents, it derives temporary extraction paths from embedded file names, and the linked libdigidocpp fix adds validateDataFilePath checks for leading slashes, backslashes, empty segments, and dot or dot-dot path components before saveAs writes the file. Reachability depends on persuading a user to open a malicious container in the desktop client, after which overwritten files are limited to locations writable by that user account.

CVSS severity8.4
High
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in RIA DigiDoc4 from 4.0.0 before 4.11.0 allows attackers to overwrite local files via crafted ASiC entry names. When DigiDoc4 opens container contents, it derives temporary extraction paths from embedded file names, and the linked libdigidocpp fix adds validateDataFilePath checks for leading slashes, backslashes, empty segments, and dot or dot-dot path components before saveAs writes the file. Reachability depends on persuading a user to open a malicious container in the desktop client, after which overwritten files are limited to locations writable by that user account.

The record

CVE
CVE-2026-70383
Published
Aug 20, 2026
Updated
Aug 20, 2026
Vendor
Estonian Information System Authority
Product
DigiDoc4
Classifications
CWE-22
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 20, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.0.0 <4.11.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Estonian Information System Authority · DigiDoc4version=4.0.0 <4.11.0

Published CVSS scores

8.4ENISACVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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