Uncontrolled Resource Consumption in asyncua and opcua
All versions of package opcua; all versions of package asyncua are vulnerable to Denial of Service (DoS) due to a missing limitation on the number of received chunks - per single session or in total for all concurrent sessions. An attacker can exploit this vulnerability by sending an unlimited number of huge chunks (e.g. 2GB each) without sending the Final closing chunk.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | asyncua | < 0.9.96 | 0.9.96 |
| Python (PyPI) | opcua | <= 0.98.13 | no fix |
References
- https://nvd.nist.gov/vuln/detail/CVE-2022-25304
- https://github.com/FreeOpcUa/python-opcua/issues/1466
- https://github.com/FreeOpcUa/opcua-asyncio/commit/01c7acf047887b62d979cd4373d370e72a4b9057
- https://github.com/FreeOpcUa/opcua-asyncio
- https://security.snyk.io/vuln/SNYK-PYTHON-ASYNCUA-2988731
- https://security.snyk.io/vuln/SNYK-PYTHON-OPCUA-2988730
- https://pypi.org/project/asyncua
- https://github.com/advisories/GHSA-mfpj-3qhm-976m
- https://pypi.org/project/opcua
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H- Weakness (CWE)
CWE-400, CWE-770- Platform
- Python (PyPI)
- Package
asyncua, opcua- Disclosed
- 24.08.2022
- Updated
- 11.10.2026 14:18
Sources and licenses
OSV / GitHub Advisory Database - PYSEC-2026-2385 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-mfpj-3qhm-976m - CC BY 4.0
OSV / GitHub Advisory Database - PYSEC-2026-888 - PyPA Advisory Database; CC BY 4.0
Vulnerability history: opcua
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
This is the only known vulnerability of this package.
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