CVE-2026-48748

A flaw was found in Netty. A remote attacker can exploit a memory exhaustion vulnerability in the Netty HTTP/3 codec by creating an infinite number of blocked streams. This can lead to an Out Of Memory OOM error, resulting in a Denial of Service DoS for the affected system. Mitigation Mitigation...

GHSA-VVGJ-X9JQ-8CJ9 quic-go: HTTP/3 QPACK Trailer Expansion Memory Exhaustion

Summary An attacker can cause excessive memory allocation in quic-go's HTTP/3 client and server implementations by sending a QPACK-encoded HEADERS frame that decodes into a large trailer field section with many unique field names and/or large values. The implementation builds an http.Header for t...

CVE-2026-47077

The CVE affects hackney (versions 2.0.0–4.0.0) due to an unbounded in-memory accumulation in hackney_h3:await_response_loop/6, where HTTP/3 response chunks are buffered without a cap. A malicious server can keep sending small chunks, preventing loop termination and exhausting the BEAM heap, leadi...

UBUNTU-CVE-2021-43848

h2o is an open source http server. In code prior to the 8c0eca3 commit h2o may attempt to access uninitialized memory. When receiving QUIC frames in certain order, HTTP/3 server-side implementation of h2o can be misguided to treat uninitialized memory as HTTP/3 frames that have been received. Whe...