How severe is CVE-2025-69229?

CVE-2025-69229 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2025-69229 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (26th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-69229?

CVE-2025-69229 affects Aiohttp. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-69229?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-69229 have an EU (EUVD) identifier?

Yes. CVE-2025-69229 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-1043.

When was CVE-2025-69229 published?

CVE-2025-69229 was published on 2026-01-06 and last updated on 2026-06-17.

CVE-2025-69229

CVE-2025-69229 is a medium-severity vulnerability in Aiohttp with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-770.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v4: 6.6
EPSS exploit prediction: 0% (26th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-1043
Weakness: CWE-770
Affected product: Aiohttp
Published: 2026-01-06
Last modified: 2026-06-17

Description

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. In versions 3.13.2 and below, handling of chunked messages can result in excessive blocking CPU usage when receiving a large number of chunks. If an application makes use of the request.read() method in an endpoint, it may be possible for an attacker to cause the server to spend a moderate amount of blocking CPU time (e.g. 1 second) while processing the request. This could potentially lead to DoS as the server would be unable to handle other requests during that time. This issue is fixed in version 3.13.3.

Frequently asked questions

What is CVE-2025-69229?: AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. In versions 3.13.2 and below, handling of chunked messages can result in excessive blocking CPU usage when receiving a large number of chunks. If an application makes use of the request.read() method in an endpoint, it may be possible for an attacker to cause the server to spend a moderate amount of blocking CPU time (e.g. 1 second) while processing the request. This could potentially lead to DoS as the server would be unable to handle other requests during that time. This issue is fixed in version 3.13.3.
How severe is CVE-2025-69229?: CVE-2025-69229 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2025-69229 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (26th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-69229?: CVE-2025-69229 affects Aiohttp. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-69229?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-69229 have an EU (EUVD) identifier?: Yes. CVE-2025-69229 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-1043.
When was CVE-2025-69229 published?: CVE-2025-69229 was published on 2026-01-06 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:aiohttp:aiohttp:*:*:*:*:*:*:*:*

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