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CVE-2026-54277— AIOHTTP: C HTTP Parser Bypasses max_line_size for Fragmented Lines

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 3.14.1之前版本存在资源管理错误漏洞，该漏洞源于C解析器中max_line_size检查可在部分HTTP请求中被绕过，可能导致攻击者通过HTTP解析器发送超长行并消耗大量内存，从而引发拒绝服务。

AI Predicted 7.5 Difficulty: Easy EPSS 0.56% · P45

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
aio-libs aiohttp < 3.14.1 affected
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I. Basic Information for CVE-2026-54277

Vulnerability Information
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Vulnerability Title
AIOHTTP: C HTTP Parser Bypasses max_line_size for Fragmented Lines
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
aio-libs aiohttp 资源管理错误漏洞
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 3.14.1之前版本存在资源管理错误漏洞，该漏洞源于C解析器中max_line_size检查可在部分HTTP请求中被绕过，可能导致攻击者通过HTTP解析器发送超长行并消耗大量内存，从而引发拒绝服务。
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 < 3.14.1 -

II. Public POCs for CVE-2026-54277

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III. Intelligence Information for CVE-2026-54277

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Patches & Fixes for CVE-2026-54277 (1)

Vendor Advisories for CVE-2026-54277 (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-2026-54273 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
CVE-2026-50269 AIOHTTP: CRLF injection in multipart headers

IV. Related Vulnerabilities

Same product: aiohttp
Same vendor: aio-libs
Same weakness: CWE-770

V. Comments for CVE-2026-54277

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