aiohttp: DigestAuthMiddleware Applies Credentials to Cross-Origin Redirect Challenges

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS 4.0

6.3 · CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N · score source

EPSS

• CVE-2026-54276: 0.31% estimated exploitation activity in the next 30 days; percentile 23.53 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary DigestAuthMiddleware can send an authentication response after following a cross-origin redirect. Impact If the client follows a redirect (the default option) to an attacker controlled domain, the attacker may be able to extract the auth digest. 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. Workaround Disable followredirects if this is a concern. ----- Patch: https://github.com/aio-libs/aiohttp/commit/38d16060037e1bfcd6d677abababa3c2a4bb58fa

Published by the source

15 Jun 2026, 20:09 UTC

Last modified by the source

10 Sep 2026, 03:50 UTC

Source last checked

26 Oct 2026, 13:45 UTC

1. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-hpj7-wq8m-9hgp

2. Revision 2 · amended · 25 Oct 2026

   Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

3. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-hpj7-wq8m-9hgp

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# Patch Next advisory brief: CVE-2026-54276

Advisory: aiohttp: DigestAuthMiddleware Applies Credentials to Cross-Origin Redirect Challenges
IDs: CVE-2026-54276, GHSA-hpj7-wq8m-9hgp
Record: https://patchnext.com/advisories/cve-2026-54276 (revision 3, source checked 26 Oct 2026, 13:45 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: aiohttp 3.14.1. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI aiohttp: affected <= 3.14.0; fixed in 3.14.1

## Suggested inspection (read-only)
- `python -m pip show aiohttp`: prints the installed version. Run with the environment that serves production active.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on aiohttp.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-hpj7-wq8m-9hgp (OSV record GHSA-hpj7-wq8m-9hgp lists affected ranges: PyPI aiohttp >=0 <3.14.1 (fixed))
- Verified: https://github.com/advisories/GHSA-hpj7-wq8m-9hgp (GitHub-reviewed advisory GHSA-hpj7-wq8m-9hgp lists affected ranges: PyPI aiohttp >=0 <=3.14.0)

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