CVE-2024-52303Network attack vector

Server memory exhaustion via middleware cache pollution

Published Nov 18, 2024 · Updated Nov 19, 2024

Resource leak in aiohttp 3.10.6 through 3.10.10 allows remote attackers to exhaust server memory through repeated invalid-method requests. Application._handle passes each fresh SystemRoute handler from a MatchInfoError into an unbounded _build_middlewares LRU cache. The condition requires aiohttp.web middleware, and exploitation requires hundreds of thousands to millions of requests before service interruption.

CVSS severity7.5
High
EPSS probability0.59%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource leak in aiohttp 3.10.6 through 3.10.10 allows remote attackers to exhaust server memory through repeated invalid-method requests. Application._handle passes each fresh SystemRoute handler from a MatchInfoError into an unbounded _build_middlewares LRU cache. The condition requires aiohttp.web middleware, and exploitation requires hundreds of thousands to millions of requests before service interruption.

The record

CVE
CVE-2024-52303
Published
Nov 18, 2024
Updated
Nov 19, 2024
Vendor
aio-libs
Product
aiohttp
Classifications
CWE-772, T1499.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 18, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 19, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 3.10.6, < 3.10.11

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

aio-libs · aiohttpversion=>= 3.10.6, < 3.10.11

Published CVSS scores

7.5GitLab Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-772Missing Release of Resource after Effective Lifetime
T1499.003Application Exhaustion Flood

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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