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Moderate severityGHSA Advisory· Published Jun 15, 2026· Updated Jun 15, 2026

aiohttp: C HTTP Parser Bypasses max_line_size for Fragmented Lines

CVE-2026-54277

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.

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

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
aiohttpPyPI
< 3.14.13.14.1

Affected products

31

Patches

Vulnerability mechanics

References

3

News mentions

1