Ubuntu Critical nghttp2 Vulnerability Poses Denial of Service Risk
Article Content
- •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.
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.
Ask AI about this cluster
Answers cite the sources they use
Timeline
More articles in this cluster (2)
Following this threat?
Track Ubuntu in your own feed — you're alerted when they show up in new reporting, leak sites or exploitation.
Free account · no card needed
Continue Reading
Critical WSO2 API Manager Vulnerability Under Active Exploitation A critical vulnerability (CVE-2026-5430) in WSO2 API Manager is being actively exploited, allowing unauthenticated attackers to forge admin tokens via JWT authentication bypass. This flaw, which has a CVSS score of 10.0, affects multiple WSO2 products including API Manager, Universal Gateway, Traffic Manager, and API… 
Massive Network of AI Proxy Servers Used for Malicious Activities Uncovered Security researchers from Team Cymru have identified over 10,000 proxy servers in China facilitating malicious AI activities. These servers, termed 'transfer stations,' are primarily used to bypass geographic restrictions and conduct model distillation attacks against frontier AI models. The infrastructure allows…