High severity · published Jun 2, 2026
CVE-2026-47265
AIOHTTP vulnerable to cross-origin redirect with per-request cookies
7.5
CVSS
0.2%
EPSS
No
On KEV
Description
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 `cookies` parameter on a per-request basis then sensitive data might be leaked to an attacker if they manage to control a redirect. Version 3.14.0 patches the issue. If unable to upgrade, using a `Cookie` header in the `headers` parameter is not vulnerable.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 4% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AI
aiohttp · aio-libs
< 3.14.0 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-47265
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-47265
Patch
https://github.com/aio-libs/aiohttp/commit/f54c40851b0d6c4bbdab97ba518a223adda32478
Mitigation
https://github.com/aio-libs/aiohttp/security/advisories/GHSA-hg6j-4rv6-33pg
More from aiohttp
9.1
CVE-2026-34520
AIOHTTP: C parser (llhttp) accepts null bytes and control characters in response header values - header injection / security bypass
8.2
CVE-2026-111066
AIOHTTP: File descriptor exhaustion in multipart requests
8.2
CVE-2026-111064
aiohttp server lacks an initial request/header timeout
7.5
CVE-2026-54273
AIOHTTP: HTTP/1 Pipelined Requests Queue Without Limit
7.5
CVE-2026-54280
AIOHTTP: Payload Response Resources Are Not Closed After Mid-Body Disconnect