CVE-2026-34993: CWE-502: Deserialization of Untrusted Data in aio-libs aiohttp
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.14.0, using ``CookieJar.load()`` with untrusted input may allow arbitrary code execution. Most applications using this function will be doing so with the user's own data, so this is unlikely to affect many applications. Version 3.14.0 patches the issue. If an application does allow attacker controlled files to be loaded, a workaround on older releases would be to sanitize the files before loading.
AI Analysis
Technical Summary
The vulnerability CVE-2026-34993 in aiohttp (an asynchronous HTTP client/server framework for Python) involves unsafe deserialization in the CookieJar.load() method before version 3.14.0. If untrusted input is passed to this method, it can result in arbitrary code execution. The issue is mitigated in version 3.14.0. Applications that load attacker-controlled files without sanitization are at risk. A workaround for older versions is to sanitize input files before loading them.
Potential Impact
Exploitation of this vulnerability can lead to arbitrary code execution when untrusted data is deserialized via CookieJar.load(). This can compromise confidentiality, integrity, and availability of the affected system. However, the impact is limited in typical use cases where only trusted user data is loaded. The CVSS 3.1 score is 6.4 (medium severity), reflecting the requirement for local access with high privileges and user interaction.
Mitigation Recommendations
A fixed version (3.14.0) of aiohttp is available that addresses this vulnerability. Users should upgrade to version 3.14.0 or later. For environments where upgrading is not immediately possible, ensure that any files loaded by CookieJar.load() are sanitized to prevent loading attacker-controlled data. Review application usage to confirm that untrusted input is not passed to this function.
CVE-2026-34993: CWE-502: Deserialization of Untrusted Data in aio-libs aiohttp
Description
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.14.0, using ``CookieJar.load()`` with untrusted input may allow arbitrary code execution. Most applications using this function will be doing so with the user's own data, so this is unlikely to affect many applications. Version 3.14.0 patches the issue. If an application does allow attacker controlled files to be loaded, a workaround on older releases would be to sanitize the files before loading.
CVSS v3.1
Score 6.4medium
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability CVE-2026-34993 in aiohttp (an asynchronous HTTP client/server framework for Python) involves unsafe deserialization in the CookieJar.load() method before version 3.14.0. If untrusted input is passed to this method, it can result in arbitrary code execution. The issue is mitigated in version 3.14.0. Applications that load attacker-controlled files without sanitization are at risk. A workaround for older versions is to sanitize input files before loading them.
Potential Impact
Exploitation of this vulnerability can lead to arbitrary code execution when untrusted data is deserialized via CookieJar.load(). This can compromise confidentiality, integrity, and availability of the affected system. However, the impact is limited in typical use cases where only trusted user data is loaded. The CVSS 3.1 score is 6.4 (medium severity), reflecting the requirement for local access with high privileges and user interaction.
Mitigation Recommendations
A fixed version (3.14.0) of aiohttp is available that addresses this vulnerability. Users should upgrade to version 3.14.0 or later. For environments where upgrading is not immediately possible, ensure that any files loaded by CookieJar.load() are sanitized to prevent loading attacker-controlled data. Review application usage to confirm that untrusted input is not passed to this function.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-03-31T19:38:31.618Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
- Vendor Advisory Urls
- [{"url":"https://access.redhat.com/security/cve/CVE-2026-34993","vendor":"Red Hat"},{"url":"https://access.redhat.com/errata/RHSA-2026:24977","vendor":"Red Hat"}]
Threat ID: 6a1f348ce29bf47b50fa1feb
Added to database: 06/02/2026, 19:52:44 UTC
Last enriched: 07/22/2026, 21:54:34 UTC
Last updated: 07/31/2026, 19:22:58 UTC
Views: 82
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