Is CVE-2026-34516 actively exploited?

No active exploitation of CVE-2026-34516 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-34516 be exploited remotely?

Yes. CVE-2026-34516 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-34516?

CVE-2026-34516 has a CVSS score of 7.5 (HIGH).

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HIGH

CVE-2026-34516

CWE-770Published: April 1, 2026· Updated: Apr 4, 2026

7.5

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:12.2th

Official Description

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.13.4, a response with an excessive number of multipart headers may be allowed to use more memory than intended, potentially allowing a DoS vulnerability. This issue has been patched in version 3.13.4.

NVD Source

Technical Analysis

CVE-2026-34516 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.