GHSA-qg5g-gv98-5ffh: rustls network-reachable panic in `Acceptor::accept`

November 25, 2024 (updated October 31, 2025)

A bug introduced in rustls 0.23.13 leads to a panic if the received TLS ClientHello is fragmented. Only servers that use rustls::server::Acceptor::accept() are affected.

Servers that use tokio-rustls’s LazyConfigAcceptor API are affected.

Servers that use tokio-rustls’s TlsAcceptor API are not affected.

Servers that use rustls-ffi’s rustls_acceptor_accept API are affected.

References

github.com/advisories/GHSA-qg5g-gv98-5ffh
github.com/rustls/rustls
github.com/rustls/rustls/issues/2227
rustsec.org/advisories/RUSTSEC-2024-0399.html

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