CVE-2026-44892
HighCVSS 7.5Exploitation Probability (EPSS)
Low risk38th percentile - higher than 38% of all known CVEs
Summary
Netty, a network application framework, prior to version 4.2.15.Final had a default configuration for `Http3ConnectionHandler` that did not enforce a maximum header size limit. This lack of restriction allows malicious clients or servers to send an enormous number of headers, leading to memory exhaustion and Denial of Service attacks.
Risk Assessment
Organizations may be vulnerable to Denial of Service attacks that can cause service outages due to memory exhaustion.
Recommendation
It is recommended to upgrade to version 4.2.15.Final or later to benefit from the patch and to configure `HTTP3_SETTINGS_MAX_FIELD_SECTION_SIZE` to limit header sizes.
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Original NVD description (English source)
Netty is a network application framework for development of protocol servers and clients. Prior to version 4.2.15.Final, the default configuration of the `Http3ConnectionHandler` in the Netty HTTP/3 codec lacks an enforced maximum header size limit. When a peer does not explicitly specify `HTTP3_SETTINGS_MAX_FIELD_SECTION_SIZE`, the implementation defaults to an unbounded limit. This insecure default configuration allows a malicious client or server to send an enormous number of headers, leading to a memory exhaustion Denial of Service via an `OutOfMemoryError`. Version 4.2.15.Final contains a patch.