CVE-2026-54276: AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python

Routine

MEDIUM 6.1UPGRADE

CVE-2026-54276 is a medium-severity flaw (CVSS 6.1) affecting aiohttp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.3% (top 77%)
CISA exploited list	No
Weakness	CWE-200, CWE-522, CWE-601
Published	2026-06-22
Last modified	2026-10-25

Publisher (CNA): GitHub, Inc. · Vendor: aiohttp

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-22 18:16 UTCPublished CVE record published
2026-10-25 23:10 UTCUpdated Record last modified

aiohttp aiohttp UPGRADE

Affected: >= 3.12.0 and < 3.14.1

Fixed in: 3.14.1

Safe to downgrade to: a release before 3.12.0

1. Check installed version

apt-cache policy aiohttp || rpm -q aiohttp || aiohttp --version

2. UPGRADE to 3.14.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade aiohttp

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade aiohttp

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 3.12.0 (Debian / Ubuntu)

apt-cache madison aiohttp sudo apt install aiohttp=<VERSION_BEFORE_3.12.0> sudo apt-mark hold aiohttp

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list aiohttp sudo dnf downgrade aiohttp-<VERSION_BEFORE_3.12.0> sudo dnf versionlock add aiohttp

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-54276?

aiohttp: upgrade to 3.14.1. Exact commands for each OS are on this page.

Is CVE-2026-54276 being exploited?

CVE-2026-54276 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-54276 affect?

CVE-2026-54276 affects aiohttp. Severity is medium (CVSS 6.1). 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 vulnera

How urgent is CVE-2026-54276?

Priority 27/100. No elevated risk signals yet.

Software pages

Python vulnerabilities

Related CVEs

CVE-2026-34515 HIGH 7.5 UPGRADE AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python
CVE-2026-34516 HIGH 7.5 UPGRADE AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python
CVE-2026-54274 HIGH 7.5 UPGRADE AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python
CVE-2026-54277 HIGH 7.5 UPGRADE AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python
CVE-2026-50269 HIGH 7.5 UPGRADE AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python

References

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