Cross-Site Scripting Risk in AIOHTTP Framework by aio-libs
CVE-2026-47265

6.6MEDIUM

Key Information:

Vendor

Aio-libs

Status
Aiohttp
Vendor
CVE Published:
2 June 2026

What is CVE-2026-47265?

The AIOHTTP framework, an asynchronous HTTP client/server for Python, has a vulnerability where cookies set via the cookies parameter are sent along with requests that follow a cross-origin redirect. This flaw could allow an attacker to exploit redirection failures and extract sensitive cookie information. To mitigate this risk, it is recommended to upgrade to version 3.14.0 or later. Alternatively, developers can use the Cookie header in the headers parameter to prevent leakage of sensitive information.

Affected Version(s)

aiohttp < 3.14.0

References

https://github.com/aio-libs/aiohttp/security/advisories/G...
x_refsource_CONFIRM
https://github.com/aio-libs/aiohttp/commit/f54c40851b0d6c...
x_refsource_MISC

CVSS V4

Score:
6.6
Severity:
MEDIUM
Confidentiality:
High
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.