Critical nghttp2 Vulnerability Poses Denial of Service Risk

Critical nghttp2 Vulnerability Poses Denial of Service Risk

First seen 7 May 2026, 11:13 UTC •Ubuntu •92% similarity •70.5

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A vulnerability in nghttp2 was discovered by Andrew MacPherson, which fails to properly validate internal state during session termination. This flaw could allow remote attackers to crash nghttp2, leading to a denial of service. The issue affects Ubuntu 26.04 LTS, and the corresponding patch was released as USN-8233-2 on May 6, 2026, following the initial advisory USN-8233-1 published on May 5, 2026. Users are advised to update their systems to mitigate the risk. The vulnerability does not have a CVE identifier mentioned in the articles, but it is critical for users relying on nghttp2 for their applications.

Key Points: • A critical vulnerability in nghttp2 could lead to denial of service attacks. • The flaw was discovered by Andrew MacPherson and affects Ubuntu 26.04 LTS. • Patches were released in USN-8233-2 on May 6, 2026, following USN-8233-1.

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Timeline

2026-05-05
USN-8233-1 advisory published
Initial advisory detailing the nghttp2 vulnerability was released, outlining the potential for denial of service.
Ubuntu
2026-05-06
USN-8233-2 patch released
A patch for the nghttp2 vulnerability was provided for Ubuntu 26.04 LTS, correcting the issue.
Ubuntu

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