CVE-2026-69243
Last modified
CVE-2026-69243 is a medium-severity vulnerability rated 6.3/10 on the CVSS scale. AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.2, the HTTP parsers were vulnerable to a request smuggling attack relating to WebSocket upgrades. EPSS estimates a 0.27% chance of exploitation in the next 30 days.
Description
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.2, the HTTP parsers were vulnerable to a request smuggling attack relating to WebSocket upgrades. If using the server-side component, an attacker may be able to execute a request smuggling vulnerability using an edge case in the WebSocket upgrade procedure. A WebSocket upgrade request with a body could cause the parser to switch protocols before the complete request body was received, leaving trailing bytes to be handled as upgraded-protocol or pipelined data rather than normal HTTP body data. This issue is fixed in version 3.14.2.
Metrics
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/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
Source: CNA advisory (CVE.org). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| aio-libs | aiohttp | < 3.14.2 |
References
Timeline
- Published
- Last Modified
- Status
- Received
Frequently Asked Questions
What is CVE-2026-69243?
How severe is CVE-2026-69243?
How do I fix CVE-2026-69243?
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-2026-69207Hono is a Web application framework that provides support fo…5.3
- CVE-2026-6921Race in GPU in Google Chrome on Windows prior to 147.0.7727.…8.3
- CVE-2026-69223Apache Allura's webhooks are vulnerable to Server-Side Reque…
- CVE-2026-6923A side-channel attack, which requires a physical presence to…3.8
- CVE-2026-6924A bug in the entropy initialization for SiWx917 causes the D…8.7
- CVE-2026-69240Sequelize is a Node.js ORM tool. Prior to 6.37.4, SQL inject…9.8
- CVE-2026-69244AIOHTTP is an asynchronous HTTP client/server framework for …7.1
- CVE-2026-69245Guzzle is an extensible PHP HTTP client. Prior to 7.15.2 and…6.5
- CVE-2026-69246Guzzle is an extensible PHP HTTP client. Prior to 7.15.2 and…7.2
- CVE-2026-69247cryptography is a package designed to expose cryptographic p…8.2
- CVE-2026-69248cryptography is a package designed to expose cryptographic p…6.9
- CVE-2026-69249python-cryptography is a package designed to expose cryptogr…8.7
Are you affected by CVE-2026-69243?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST