CVE-2026-54277
Last modified
CVE-2026-54277 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.1, it is possible to bypass the max_line_size check in parts of an HTTP request in the C parser. EPSS estimates a 0.28% chance of exploitation in the next 30 days.
Description
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.1, it is possible to bypass the max_line_size check in parts of an HTTP request in the C parser. If using the optimised C parser (the default in pre-built wheels), then an attacker may be able to send oversized lines through the HTTP parser and use an excessive amount of memory, potentially leading to DoS. This vulnerability is fixed in 3.14.1.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Aiohttp | Aiohttp | < 3.14.1 |
References
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-54277?
How severe is CVE-2026-54277?
How do I fix CVE-2026-54277?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-54271protobufjs-cli is the command line add-on for protobuf.js. P…8.2
- CVE-2026-54272ip-address is a library for parsing and manipulating IPv4 an…6.9
- CVE-2026-54273AIOHTTP is an asynchronous HTTP client/server framework for …7.5
- CVE-2026-54274AIOHTTP is an asynchronous HTTP client/server framework for …7.5
- CVE-2026-54275AIOHTTP is an asynchronous HTTP client/server framework for …7.5
- CVE-2026-54276AIOHTTP is an asynchronous HTTP client/server framework for …6.1
- CVE-2026-54278AIOHTTP is an asynchronous HTTP client/server framework for …7.5
- CVE-2026-54279AIOHTTP is an asynchronous HTTP client/server framework for …7.5
- CVE-2026-5428The Royal Elementor Addons plugin for WordPress is vulnerabl…6.4
- CVE-2026-54280AIOHTTP is an asynchronous HTTP client/server framework for …7.5
- CVE-2026-54281Nest is a framework for building scalable Node.js server-sid…8.7
- CVE-2026-54282Starlette is a lightweight ASGI framework/toolkit. Prior to …5.3
Are you affected by CVE-2026-54277?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST