---
schema_version: '1.0'
id: security-20260711-519445
url: https://osv.dev/vulnerability/GHSA-63hw-fmq6-xxg2
url_hash: 519445ae68012a6dd78d41a572eaf24c721c076cd348e6dda54f3ddb387e36f6
canonical_url: https://osv.dev/vulnerability/GHSA-63hw-fmq6-xxg2
source: osv:ghsa
category: security/library
category_raw: cve/library
region: null
tags:
- cve
- CVE-2026-54277
- GHSA-63hw-fmq6-xxg2
- severity: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
- aiohttp
- PyPI
lang: en
published_at: '2026-06-15T20:09:16Z'
fetched_at: '2026-07-11T06:37:17Z'
updated_at: '2026-07-11T06:38:28Z'
status: published
content_hash: 5ba9ccce224976bfbce2780421ef08dcf9df09fdfec5ef05a6e971f6077d9788
license_note: full
summary: 'aiohttp: C HTTP Parser Bypasses max_line_size for Fragmented Lines'
summary_source: rss
summary_en: 'aiohttp: C HTTP Parser Bypasses max_line_size for Fragmented Lines'
entities:
- name: https://deploymentsafety.openai.com/gpt-5-6/gpt-5-6.pdf
  type: artifact
- name: Max Planck
  type: person
key_facts: []
related: []
related_auto: []
title: 'CVE-2026-54277: aiohttp: C HTTP Parser Bypasses max_line_size for Fragmented
  Lines'
---

# CVE-2026-54277: aiohttp: C HTTP Parser Bypasses max_line_size for Fragmented Lines

## TL;DR
aiohttp: C HTTP Parser Bypasses max_line_size for Fragmented Lines

## Key Points
- cve / CVE-2026-54277 / GHSA-63hw-fmq6-xxg2 / severity: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 / aiohttp / PyPI

## Details
**Severity:** 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
**Advisory:** GHSA-63hw-fmq6-xxg2 (CVE-2026-54277)

**Affected (your watchlist):**
- `PyPI:aiohttp` 3.13.3 → fixed in 3.14.1 [docker/docker-strands]

**Details:**
### Summary

It is possible to bypass the max_line_size check in parts of an HTTP request in the C parser.

### Impact

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.

-----

Patch: https://github.com/aio-libs/aiohttp/commit/5ab61bb4cd88f19b712f12c7c9295fe262bf804d

**References:**
- https://github.com/aio-libs/aiohttp/security/advisories/GHSA-63hw-fmq6-xxg2
- https://github.com/aio-libs/aiohttp/commit/5ab61bb4cd88f19b712f12c7c9295fe262bf804d
- https://github.com/aio-libs/aiohttp

_Data: OSV.dev (upstream: ghsa) — https://osv.dev/vulnerability/GHSA-63hw-fmq6-xxg2_

## Source
元記事: [CVE-2026-54277: aiohttp: C HTTP Parser Bypasses max_line_size for Fragmented Lines](https://osv.dev/vulnerability/GHSA-63hw-fmq6-xxg2) — published 2026-06-15T20:09:16Z