What is CVE-2026-34993?

CVE-2026-34993 is a medium-severity vulnerability in Aiohttp, classified under Deserialization of Untrusted Data. CVSS score: 6.4/10. Published 2026-06-02.

How severe is CVE-2026-34993?

Medium severity. CVSS v3 base score is 6.4 out of 10.

Deserialization in Aiohttp

CVE-2026-34993

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 doin…

Vulnerability class: Insecure Deserialization

EPSS: 0.001 (17.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:C/C:L/I:H/A:L.

Affected products

Aiohttp
Aio-libs Aiohttp — versions < 3.14.0

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

security-advisories@github.com (x_refsource_CONFIRM, Patch, Mitigation, Vendor Advisory)
security-advisories@github.com (Patch, x_refsource_MISC)

Frequently asked questions

What is CVE-2026-34993?: CVE-2026-34993 is a medium-severity vulnerability in Aiohttp, classified under Deserialization of Untrusted Data. CVSS score: 6.4/10. Published 2026-06-02.
How severe is CVE-2026-34993?: Medium severity. CVSS v3 base score is 6.4 out of 10.