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CVE-2026-50269— AIOHTTP: CRLF injection in multipart headers

Quick assessment

Affected
aio-libs aiohttp
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

aio-libs aiohttp是aio-libs的异步HTTP客户端/服务器框架。 aio-libs aiohttp 3.14.0之前版本存在输入验证错误漏洞，该漏洞源于输入验证错误，导致攻击者可将恶意输入包含到multipart/payload标头中，用于修改请求以注入额外标头或改变请求内容。

AI Predicted 7.5 Difficulty: Moderate EPSS 0.53% · P43

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
aio-libs aiohttp < 3.14.0 affected
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I. Basic Information for CVE-2026-50269

Vulnerability Information
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Vulnerability Title
AIOHTTP: CRLF injection in multipart headers
Source: CVE Program / CVE List V5
Vulnerability Description
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.0, attacker-controlled input included into multipart/payload headers can be used to modify a request to inject additional headers or similar. In the unlikely situation that an application is passing user-controlled strings into MultipartWriter.append(headers=...) or Payload.headers, then an attacker may be able to modify the request to inject headers or change the contents of the request. This vulnerability is fixed in 3.14.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U
Source: CVE Program / CVE List V5
Vulnerability Type
对CRLF序列的转义处理不恰当(CRLF注入)
Source: CVE Program / CVE List V5
Vulnerability Title
aio-libs aiohttp 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
aio-libs aiohttp是aio-libs的异步HTTP客户端/服务器框架。 aio-libs aiohttp 3.14.0之前版本存在输入验证错误漏洞，该漏洞源于输入验证错误，导致攻击者可将恶意输入包含到multipart/payload标头中，用于修改请求以注入额外标头或改变请求内容。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
aio-libs aiohttp < 3.14.0 -

II. Public POCs for CVE-2026-50269

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III. Intelligence Information for CVE-2026-50269

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Patches & Fixes for CVE-2026-50269 (1)

Vendor Advisories for CVE-2026-50269 (1)

Same Patch Batch · aio-libs · 2026-06-22 · 9 CVEs total

CVE-2026-54274 AIOHTTP: Incomplete websocket frame payloads bypass memory limits
CVE-2026-54280 AIOHTTP: Payload Response Resources Are Not Closed After Mid-Body Disconnect
CVE-2026-54277 AIOHTTP: C HTTP Parser Bypasses max_line_size for Fragmented Lines
CVE-2026-54273 AIOHTTP: HTTP/1 Pipelined Requests Queue Without Limit
CVE-2026-54278 AIOHTTP: Unread Compressed Request Bodies Bypass client_max_size During Cleanup
CVE-2026-54279 AIOHTTP: Host-Only Cookies Become Domain Cookies After CookieJar Persistence
CVE-2026-54275 AIOHTTP: TLS Server Hostname Override Is Ignored When Reusing HTTPS Connections
CVE-2026-54276 AIOHTTP: DigestAuthMiddleware Applies Credentials to Cross-Origin Redirect Challenges

IV. Related Vulnerabilities

Same product: aiohttp
Same vendor: aio-libs
Same weakness: CWE-93

V. Comments for CVE-2026-50269

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