EUVD-2026-43336Severity by source
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network, unauthenticated path traversal, but exploitation requires the app to ingest and process a crafted email (attack requirement) so AC:H; arbitrary write to importable files yields full C/I/A impact.
Primary rating from Vendor (THA-PSIRT).
CVSS VectorVendor: THA-PSIRT
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
2DescriptionCVE.org
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.
Articles & Coverage 1
AnalysisAI
Remote unauthenticated code execution in Thales CERT's "Suspicious" email-analysis application (versions 1.3.4 and earlier), dubbed "Matryoshka Mail," lets an attacker abuse path traversal in attachment handling to overwrite writable application files-Python modules, configuration, cron inputs, and runtime artifacts-yielding root-level execution inside the Django container. Because the affected code runs Python and processes attacker-supplied mail, overwriting an imported module effectively converts arbitrary file write into RCE, plus persistent denial of service and possible exposure of application secrets and integrations. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The concrete prerequisite is that a running Suspicious instance (<= 1.3.4) must ingest and process the attacker's crafted "Matryoshka Mail" message-the path traversal is triggered through the application's normal email/attachment handling, not a separate authenticated action. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Signals are mostly aligned toward high priority but with one important nuance. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker emails a specially crafted "Matryoshka Mail" message with nested/attachment content whose embedded path escapes the intended storage directory; when the Suspicious application ingests and processes it, the traversal writes attacker-controlled content over an imported Python module or config file. On the next import or scheduled run the payload executes as root inside the Django container, giving the attacker code execution, the ability to brick the service (persistent DoS), and access to stored secrets. … |
| Remediation | No exact fixed version is included in the provided data, so consult and apply the remediation in the vendor advisory GHSA-x85x-9mrm-wwvp (https://github.com/thalesgroup-cert/suspicious/security/advisories/GHSA-x85x-9mrm-wwvp) and upgrade beyond 1.3.4 to the patched release referenced there. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify all systems running Matryoshka Mail versions 1.3.4 and earlier and isolate them or restrict email traffic to trusted sources only. …
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Same weakness CWE-22 – Path Traversal
View allSame technique Denial Of Service
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External POC / Exploit Code
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