CVE-2026-54276 AIOHTTP: DigestAuthMiddleware Applies Credentials to Cross-Origin Redirect Challenges
AIOHTTP's DigestAuthMiddleware may leak user credentials to cross-origin redirect targets, allowing attackers to potentially recover sensitive authentication data.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-54276?
CVE-2026-54276 is a medium-severity vulnerability in aio-libs aiohttp, published on 22 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.1, DigestAuthMiddleware can send an authentication response after following a cross-origin redirect. This likely requires an open redirect vulnerability or similar on the target domain for an attacker to be able to execute. Further, the attacker is only receiving the digest, so should only be able to extract the user's credentials if the cryptography is weak or there is some kind of password reuse. This vulnerability is fixed in 3.14.1.
Which versions are affected by CVE-2026-54276?
3 open source packages ship an affected version, including aiohttp. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
aiohttp PyPI | All versions | 3.14.1 |
aiohttp PyPI | All versions | 3.14.1 |
aiohttp PyPI | All versions | 3.14.1 |
Products include Aiohttp Aiohttp.
How do I fix CVE-2026-54276?
Upgrade aiohttp to 3.14.1 or later.
Is CVE-2026-54276 being exploited?
There is no known exploitation of CVE-2026-54276 in the wild and no public exploit code.
Other vulnerabilities in aio-libs aiohttp
- CVE-2024-52303 aiohttp memory leak when middleware is enabled when requesting a resource with a non-allowed method
- CVE-2025-69223 AIOHTTP's HTTP Parser auto_decompress feature is vulnerable to zip bomb
- CVE-2024-30251 Denial of service when trying to parse malformed POST requests in aiohttp
- CVE-2023-49081 aiohttp's ClientSession is vulnerable to CRLF injection via version
- CVE-2026-22815 AIOHTTP: Uncapped memory usage possible through aiohttp allowing unlimited trailer headers
Sources
Also known as CLEANSTART-2026-LF30354, CLEANSTART-2026-WD11745, DEBIAN-CVE-2026-54276, ECHO-063c-9c61-c3d6, GHSA-hpj7-wq8m-9hgp, MINI-5249-7v73-j4m3 and 19 more.