PYSEC-2026-888

    Dashboard / Vulnerabilities / PYSEC-2026-888

    PYSEC-2026-888

    Published: 6 Jul 2026Last Modified: 13 Jul 2026

    Summary: Uncontrolled Resource Consumption in asyncua and opcua

    Details: 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.

    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/opcua, https://github.com/advisories/GHSA-mfpj-3qhm-976m

    Affected packages

    Package

    Name: opcua

    Purl: pkg:pypi/opcua

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    0.90.4

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    PYSEC-2026-888 | CVE-DB