AIOHTTP is Vulnerable to Deserialization of Untrusted Data

HIGH 7.3CVE-2026-34993 · GHSA-jg22-mg44-37j8 · PYSEC-2026-2104 · Published 02/06/2026 · updated 04/09/2026

Package	Affected versions	Patched versions
aiohttp PyPI	`< 3.14.0`	`3.14.0`
aiohttp aiohttp	`< 3.14.0`	`3.14.0`

Description

Summary

Using CookieJar.load() with untrusted input may allow arbitrary code execution.

Impact

Most applications using this function will be doing so with the user's own data, so this is unlikely to affect many applications.

Workaround

If an application does allow attacker controlled files to be loaded, a workaround on older releases would be to sanitise the files before loading.

Patch: https://github.com/aio-libs/aiohttp/commit/dcf40f30637e8752c76781cf6703b5a236749a00

NVD description

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.14.0, using ``CookieJar.load()`` with untrusted input may allow arbitrary code execution. Most applications using this function will be doing so with the user's own data, so this is unlikely to affect many applications. Version 3.14.0 patches the issue. If an application does allow attacker controlled files to be loaded, a workaround on older releases would be to sanitize the files before loading.

References

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