How severe is CVE-2024-52304?

No CVSS score has been assigned to CVE-2024-52304 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by CVE-2024-52304?

CVE-2024-52304 affects the following packages: aiohttp (PyPI). Ecosystems affected: PyPI.

How do I fix CVE-2024-52304?

Update aiohttp to 3.10.11 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2024-52304 is resolved across your whole dependency graph.

How do I detect CVE-2024-52304 in my PyPI dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for aiohttp, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2024-52304 if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Is CVE-2024-52304 actively exploited in the wild?

No public exploit code has been indexed for CVE-2024-52304 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2024-52304?

CVE-2024-52304 has an EPSS (Exploit Prediction Scoring System) score of 0.6%, placing it in the 47th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2024-52304?

CVE-2024-52304 is classified as CWE-444 (CWE-444). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2024-52304 published, and has it been updated?

CVE-2024-52304 was published on November 18, 2024 and was last updated on October 28, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐍 PyPI

Not in CISA KEV

CVE-2024-52304 — aiohttp

Fix: aio-libs/aiohttp@259edc3

CVE-2024-52304 is a CWE-444 vulnerability in aiohttp. A fix is available for aiohttp — see the affected versions and patch details below.

aiohttp vulnerable to request smuggling due to incorrect parsing of chunk extensions

Also known asGHSA-8495-4g3g-x7prPYSEC-2026-1103

Published

Nov 18, 2024

Updated

Oct 28, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Nov 8, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2024-52304.

EPSS Exploitation Probability

via FIRST.org ↗

0.6%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs47th percentile — riskier than 47% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

Real-World Exposure

1 pkg affected

🐍aiohttp

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.

Description

aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.10.11, the Python parser parses newlines in chunk extensions incorrectly which can lead to request smuggling vulnerabilities under certain conditions. If a pure Python version of aiohttp is installed (i.e. without the usual C extensions) or AIOHTTP_NO_EXTENSIONS is enabled, then an attacker may be able to execute a request smuggling attack to bypass certain firewalls or proxy protections. Version 3.10.11 fixes the issue.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐍PyPI	`aiohttp`	all versions	3.10.11`pip install --upgrade 'aiohttp==3.10.11'`

Affected Products

1 product · 1 configurations

Application

aiohttpaiohttp

< 3.10.11

range

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for aiohttp, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update aiohttp to 3.10.11 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2024-52304 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Fixing This On Your OS

If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.

Red HatModerate

Product	Fixed in	Advisory
Ansible Automation Platform Execution Environments	`ansible-automation-platform/ee-minimal-rhel8:2.12.10-57`	RHSA-2025:0753
Ansible Automation Platform Execution Environments	`ansible-automation-platform/ee-minimal-rhel8:2.12.10-59`	RHSA-2025:1101
Red Hat Ansible Automation Platform 2.4 for RHEL 8	`ansible-automation-platform-24/lightspeed-rhel8-operator:2.4-33`	RHSA-2025:0722
Red Hat Ansible Automation Platform 2.5 for RHEL 8	`automation-controller-0:4.6.3-1.el8ap`	RHSA-2024:10766
Red Hat Ansible Automation Platform 2.5 for RHEL 8	`python3.11-aiohttp-0:3.10.11-1.el8ap`	RHSA-2025:0340
Red Hat Ansible Automation Platform 2.5 for RHEL 8	`ansible-automation-platform-25/lightspeed-rhel8:2.5.250107-1`	RHSA-2025:0341
Red Hat Satellite 6.16 for RHEL 8	`python-aiohttp-0:3.10.11-1.el8pc`	RHSA-2024:11574

Frequently Asked Questions

aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.10.11, the Python parser parses newlines in chunk extensions incorrectly which can lead to request smuggling vulnerabilities under certain conditions. If a pure Python version of aiohttp is installed (i.e. without the usual C extensions) or `AIOHTTP_NO_EXTENSIONS` is enabled, then an attacker may be able to execute a request smuggling attack to bypass certain firewalls or proxy protections. Version 3.10.11 fixes the issue.

O3 Security · Impact-Aware SCA

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