CVE-2026-54277: CWE-770: Allocation of Resources Without Limits or Throttling in aio-libs aiohttp
CVE-2026-54277 affects aiohttp, an asynchronous HTTP client/server framework for Python. Versions prior to 3.14.1 allow bypassing the max_line_size check in parts of an HTTP request when using the default optimized C parser. This can lead to processing oversized HTTP request lines, resulting in excessive memory consumption and potential denial of service. The vulnerability is fixed in version 3.14.1.
AI Analysis
Technical Summary
The vulnerability in aiohttp before version 3.14.1 involves the ability to bypass the max_line_size check in the HTTP request parser when using the optimized C parser. This allows an attacker to send oversized lines through the HTTP parser, causing excessive memory allocation without limits or throttling (CWE-770). This can lead to denial of service due to resource exhaustion. The issue is resolved in aiohttp 3.14.1.
Potential Impact
An attacker can exploit this vulnerability by sending specially crafted HTTP requests with oversized lines that bypass the max_line_size check, causing the server to allocate excessive memory. This can degrade service availability or cause denial of service conditions. There is no indication of privilege escalation or data compromise from the provided data.
Mitigation Recommendations
Upgrade aiohttp to version 3.14.1 or later, where this vulnerability is fixed. No other mitigation or temporary workaround is indicated in the provided information.
CVE-2026-54277: CWE-770: Allocation of Resources Without Limits or Throttling in aio-libs aiohttp
Description
CVE-2026-54277 affects aiohttp, an asynchronous HTTP client/server framework for Python. Versions prior to 3.14.1 allow bypassing the max_line_size check in parts of an HTTP request when using the default optimized C parser. This can lead to processing oversized HTTP request lines, resulting in excessive memory consumption and potential denial of service. The vulnerability is fixed in version 3.14.1.
CVSS v4.0
Score 6.6medium
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in aiohttp before version 3.14.1 involves the ability to bypass the max_line_size check in the HTTP request parser when using the optimized C parser. This allows an attacker to send oversized lines through the HTTP parser, causing excessive memory allocation without limits or throttling (CWE-770). This can lead to denial of service due to resource exhaustion. The issue is resolved in aiohttp 3.14.1.
Potential Impact
An attacker can exploit this vulnerability by sending specially crafted HTTP requests with oversized lines that bypass the max_line_size check, causing the server to allocate excessive memory. This can degrade service availability or cause denial of service conditions. There is no indication of privilege escalation or data compromise from the provided data.
Mitigation Recommendations
Upgrade aiohttp to version 3.14.1 or later, where this vulnerability is fixed. No other mitigation or temporary workaround is indicated in the provided information.
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
- Remediation Level
- null
Threat ID: 6a39735beed863c81e396261
Added to database: 06/22/2026, 17:39:39 UTC
Last enriched: 06/22/2026, 17:55:34 UTC
Last updated: 06/22/2026, 20:21:55 UTC
Views: 3
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