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Vulnerability · Published Jun 2, 2026 · Assigned by GitHub_M

CVE-2026-34993AIOHTTP Vulnerable to Deserialization of Untrusted Data

Medium 6.4

In plain English

A medium-severity unsafe deserialization in aiohttp from aio-libs. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 8% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.4Medium
Exploit odds (30 days)0.2%top 92.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12python-aiohttp3.8.4-1+deb12u2DEBIAN-CVE-2026-34993
Debian:13python-aiohttpno fix listedDEBIAN-CVE-2026-34993
Debian:14python-aiohttp3.14.0-1DEBIAN-CVE-2026-34993
PyPIaiohttp3.14.0PYSEC-2026-2104
PyPIaiohttp3.14.0GHSA-jg22-mg44-37j8
Ubuntu:25.10python-aiohttpno fix listedUBUNTU-CVE-2026-34993
Ubuntu:26.10python-aiohttpno fix listedUBUNTU-CVE-2026-34993

Affected products (as reported)

VendorProductVersions
aio-libs aiohttp < 3.14.0

Weakness: CWE-502 · Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:C/C:L/I:H/A:L

References