Buffer Overflow Vulnerability in AIOHTTP Framework by aio-libs

CVE-2026-34520

What is CVE-2026-34520?

A critical vulnerability in the AIOHTTP framework, which serves as an asynchronous HTTP client and server for Python, was identified prior to version 3.13.4. The issue arises from the C parser, which incorrectly processes null bytes and control characters in response headers. This flaw can potentially expose systems to various security risks. A patch has been implemented in version 3.13.4, ensuring that such vulnerabilities are mitigated effectively. Users are strongly encouraged to upgrade to this version or later to maintain the integrity and security of their applications.

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