What’s Vulnerable › Vulnerabilities

CVE-2023-26151

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2023-10-03 · updated 2026-06-17
• Weakness: CWE-400

Description

Versions of the package asyncua before 0.9.96 are vulnerable to Denial of Service (DoS) such that an attacker can send a malformed packet and as a result, the server will enter into an infinite loop and consume excessive memory.

Affected products

• Freeopcua Opcua-Asyncio: before 0.9.96 — fixed in 0.9.96

How to fix

Upgrade to a fixed version: Freeopcua Opcua-Asyncio 0.9.96. Check the vendor advisory for mitigations.

References

• https://gist.github.com/artfire52/1540b234350795e0ecb4d672608dbec8
• https://github.com/FreeOpcUa/opcua-asyncio/commit/f6603daa34a93a658f0e176cb0b9ee5a6643b262
• https://github.com/FreeOpcUa/opcua-asyncio/issues/1013
• https://github.com/FreeOpcUa/opcua-asyncio/pull/1039
• https://github.com/FreeOpcUa/opcua-asyncio/releases/tag/v0.9.96
• https://security.snyk.io/vuln/SNYK-PYTHON-ASYNCUA-5673709
• https://gist.github.com/artfire52/1540b234350795e0ecb4d672608dbec8
• https://github.com/FreeOpcUa/opcua-asyncio/commit/f6603daa34a93a658f0e176cb0b9ee5a6643b262
• https://github.com/FreeOpcUa/opcua-asyncio/issues/1013
• https://github.com/FreeOpcUa/opcua-asyncio/pull/1039
• https://github.com/FreeOpcUa/opcua-asyncio/releases/tag/v0.9.96
• https://security.snyk.io/vuln/SNYK-PYTHON-ASYNCUA-5673709

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