PT-2026-49591 · Pypi · Aiohttp

Published 2026-06-15 · Updated 2026-06-15 · CVE-2026-54277

OSV

CVSS v4.0

6.6

Medium

Base vector

AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U

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.

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

Fix

Allocation of Resources Without Limits

Weakness Enumeration

CWE-770

Related Identifiers

CVE-2026-54277

GHSA-63HW-FMQ6-XXG2

Affected Products

Aiohttp

References · 4

• https://osv.dev/vulnerability/GHSA-63hw-fmq6-xxg2 · Vendor Advisory
• https://github.com/aio-libs/aiohttp/security/advisories/GHSA-63hw-fmq6-xxg2 · Note
• https://github.com/aio-libs/aiohttp/commit/5ab61bb4cd88f19b712f12c7c9295fe262bf804d · Note
• https://github.com/aio-libs/aiohttp · Note