What is CVE-2026-47265?

CVE-2026-47265 is a high-severity vulnerability in Aiohttp, classified under Origin Validation Error. CVSS score: 7.5/10. Published 2026-06-02.

How severe is CVE-2026-47265?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Aiohttp

CVE-2026-47265

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.14.0, cookies set with the `cookies` parameter on requests are sent after following a cross-origin redirect. If a developer uses the `cookie…

EPSS: 0.000 (5.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

Affected products

Aiohttp
Aio-libs Aiohttp — versions < 3.14.0

Weakness classification (CWE)

CWE-346 — Origin Validation Error

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-2026-47265?: CVE-2026-47265 is a high-severity vulnerability in Aiohttp, classified under Origin Validation Error. CVSS score: 7.5/10. Published 2026-06-02.
How severe is CVE-2026-47265?: High severity. CVSS v3 base score is 7.5 out of 10.