aio-libs/aiohttp · Security
aiohttp: C HTTP Parser Bypasses max_line_size for Fragmented Lines
- GHSA ID
- GHSA-63hw-fmq6-xxg2
- CVE ID
- CVE-2026-54277
- Severity
- medium
- Published
- Updated
- CVSS v4
- 6.6 · 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
Description
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
CWEs
- CWE-770 · Allocation of Resources Without Limits or Throttling