CVE-2026-54276: CWE-200: Exposure of Sensitive Information to an Unauthorized Actor in aio-libs aiohttp
### 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 ``follow_redirects`` if this is a concern. ----- Patch: https://github.com/aio-libs/aiohttp/commit/38d16060037e1bfcd6d677abababa3c2a4bb58fa
AI Analysis
Technical Summary
CVE-2026-54276 is a medium severity vulnerability in aiohttp, an asynchronous HTTP client/server framework for Python. Before version 3.14.1, the DigestAuthMiddleware component could send an authentication response after following a cross-origin redirect. Exploitation likely depends on the presence of an open redirect vulnerability on the target domain. The attacker receives the digest authentication response, which may expose user credentials only if cryptographic protections are weak or if passwords are reused. This vulnerability is addressed in aiohttp version 3.14.1.
Potential Impact
An attacker exploiting this vulnerability can obtain digest authentication responses after cross-origin redirects, potentially exposing sensitive authentication information. However, successful credential compromise depends on weak cryptography or password reuse by the user. There is no indication of active exploitation in the wild.
Mitigation Recommendations
Upgrade aiohttp to version 3.14.1 or later, where this vulnerability is fixed. No other mitigations are indicated or required by the vendor advisory.
CVE-2026-54276: CWE-200: Exposure of Sensitive Information to an Unauthorized Actor in aio-libs aiohttp
Description
### 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 ``follow_redirects`` if this is a concern. ----- Patch: https://github.com/aio-libs/aiohttp/commit/38d16060037e1bfcd6d677abababa3c2a4bb58fa
CVSS v4.0
Score 6.3medium
Affected software
aio-libs
aiohttp
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-54276 is a medium severity vulnerability in aiohttp, an asynchronous HTTP client/server framework for Python. Before version 3.14.1, the DigestAuthMiddleware component could send an authentication response after following a cross-origin redirect. Exploitation likely depends on the presence of an open redirect vulnerability on the target domain. The attacker receives the digest authentication response, which may expose user credentials only if cryptographic protections are weak or if passwords are reused. This vulnerability is addressed in aiohttp version 3.14.1.
Potential Impact
An attacker exploiting this vulnerability can obtain digest authentication responses after cross-origin redirects, potentially exposing sensitive authentication information. However, successful credential compromise depends on weak cryptography or password reuse by the user. There is no indication of active exploitation in the wild.
Mitigation Recommendations
Upgrade aiohttp to version 3.14.1 or later, where this vulnerability is fixed. No other mitigations are indicated or required by the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-06-12T17:13:32.280Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a39735beed863c81e39625d
Added to database: 06/22/2026, 17:39:39 UTC
Last enriched: 06/29/2026, 21:51:30 UTC
Last updated: 09/21/2026, 22:01:35 UTC
Views: 104
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