CVE-2026-34183

Issue summary: Remote peer may exhaust heap memory of the QUIC<br /> server or client by flooding it with packets containing PATH_CHALLENGE<br /> frames.<br /> <br /> Impact summary: A malicious remote peer can cause an unbounded<br /> memory allocation which can lead to an abnormal termination of the<br /> application acting as a QUIC client or server and a Denial of Service.<br /> <br /> A remote peer may exhaust heap memory by flooding the local<br /> QUIC stack with PATH_CHALLENGE frames. The local QUIC stack<br /> allocates a PATH_RESPONSE frame for every PATH_CHALLENGE it receives.<br /> The allocated PATH_RESPONSE frame gets freed only when the remote<br /> peer acknowledges reception of the PATH_RESPONSE frame which will<br /> not be done by a malicious peer.<br /> <br /> The FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by<br /> this issue. The QUIC stack is outside of OpenSSL FIPS module<br /> boundary.