Description
A vulnerability in Thales CERT "Suspicious" application =< 1.3.4 allows a remote and unauthenticated attacker to execute arbitrary code and arbitrarily overwrite writable application files—including Python modules, configuration files, cron inputs, and runtime artifacts—leading to a persistent denial of service, the potential compromise of application secrets or integrations, and root-level execution inside the Django application container.
This vulnerability has been names "Matryoshka Mail".
Thales PSIRT
acknowledges and thanks

Lucien Doustaly (aka wlayzz) for discovering and reporting this issue.
Published: 2026-07-13
Score: 9.2 Critical
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Impact

A flaw in Thales CERT Suspicious application versions up to and including 1.3.4 permits a remote, unauthenticated attacker to execute arbitrary code and overwrite any writable application files—including Python modules and configuration files—within the Django container. The consequences are a persistent denial of service, compromised application secrets or integration points, and the ability to achieve root‑level execution inside the container. The vulnerability stems from file path traversal, relative path injection, and code injection weaknesses (CWE‑22, CWE‑73, CWE‑94).

Affected Systems

All deployments of the Thales CERT Suspicious application with version numbers below 1.3.5 are affected. The application runs as a Django web service within a containerized environment and requires an upgrade to the patched release v1.3.5 to remove the flaw.

Risk and Exploitability

The CVSS score of 9.2 indicates critical severity, while the EPSS score of less than 1% shows the likelihood of observed exploitation is currently low. The vulnerability is listed as not included in CISA’s KEV catalog. Based on the description, it is inferred that attackers can exploit the weakness from outside the network without authentication by crafting malicious requests that trigger arbitrary file writes or code execution inside the container.

Generated by OpenCVE AI on July 31, 2026 at 11:41 UTC.

Remediation

Vendor Solution

Upgrade to version v1.3.5


OpenCVE Recommended Actions

  • Upgrade the Suspicious application to v1.3.5 as provided by Thales CERT.
  • Reconfigure the application to run with the minimal required privileges; remove write permissions from directories that store Python modules, configuration files, cron inputs, and runtime artifacts.
  • Harden AppArmor or seccomp to prevent privilege escalation.

Generated by OpenCVE AI on July 31, 2026 at 11:41 UTC.

Tracking

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Advisories

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History

Mon, 13 Jul 2026 15:00:00 +0000

Type Values Removed Values Added
First Time appeared Thalesgroup
Thalesgroup cert Suspicious
Vendors & Products Thalesgroup
Thalesgroup cert Suspicious

Mon, 13 Jul 2026 14:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Mon, 13 Jul 2026 10:00:00 +0000

Type Values Removed Values Added
Description A vulnerability in Thales CERT "Suspicious" application =< 1.3.4 allows a remote and unauthenticated attacker to execute arbitrary code and arbitrarily overwrite writable application files—including Python modules, configuration files, cron inputs, and runtime artifacts—leading to a persistent denial of service, the potential compromise of application secrets or integrations, and root-level execution inside the Django application container. This vulnerability has been names "Matryoshka Mail". Thales PSIRT acknowledges and thanks Lucien Doustaly (aka wlayzz) for discovering and reporting this issue.
Title Remote Code Execution vulnerability in "Suspicious" application
Weaknesses CWE-22
CWE-73
CWE-94
References
Metrics cvssV4_0

{'score': 9.2, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}


Subscriptions

Thalesgroup Cert Suspicious
cve-icon MITRE

Status: PUBLISHED

Assigner: THA-PSIRT

Published:

Updated: 2026-07-13T14:07:27.982Z

Reserved: 2026-06-23T15:40:38.489Z

Link: CVE-2026-13014

cve-icon Vulnrichment

Updated: 2026-07-13T14:07:14.800Z

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-07-31T11:45:13Z

Weaknesses
  • CWE-22

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

  • CWE-73

    External Control of File Name or Path

  • CWE-94

    Improper Control of Generation of Code ('Code Injection')