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aiohttp C parser max_line_size bypass leads to DoS

A security vulnerability in aiohttp's C parser allows bypassing the max_line_size check, potentially leading to memory exhaustion and DoS.

16 Jun 2026Read 1 minSeverity: schedule it

What changed

A security vulnerability in aiohttp's C parser allows bypassing the max_line_size check, potentially leading to memory exhaustion and DoS.

Who it affects

Users of aiohttp with the default C parser enabled (pre-built wheels).

What to do today

Apply the patch from commit 5ab61bb4cd88f19b712f12c7c9295fe262bf804d or upgrade to a fixed version.

The trail
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