CVE-2026-61544

libp2p-rust is the official Rust language implementation of the libp2p networking stack. Prior to 0.13.1, libp2p-quic could panic during an inbound QUIC handshake when a remote peer presented a valid short-lived libp2p TLS certificate and delayed the final TLS 1.3 handshake fragment until after the certificate expired. In the Quinn post-handshake upgrade path, transports/quic/src/connection/connecting.rs called libp2p_tls::certificate::parse a second time in remote_peer_id and used expect on the result. The repeated wall-clock validity check could reject the now-expired certificate, causing the expect call to terminate any application exposing an affected libp2p-quic listener. This vulnerability is fixed in 0.13.1.

libp2p-rust is the official Rust language implementation of the libp2p networking stack. Prior to 0.13.1, libp2p-quic could panic during an inbound QUIC handshake when a remote peer presented a valid short-lived libp2p TLS certificate and delayed the final TLS 1.3 handshake fragment until after the certificate expired. In the Quinn post-handshake upgrade path, transports/quic/src/connection/connecting.rs called libp2p_tls::certificate::parse a second time in remote_peer_id and used expect on the result. The repeated wall-clock validity check could reject the now-expired certificate, causing the expect call to terminate any application exposing an affected libp2p-quic listener. This vulnerability is fixed in 0.13.1.

Summary

libp2p-quic can panic on an inbound QUIC handshake if a malicious peer presents a valid, short lived libp2p TLS certificate and delays the final TLS 1.3 handshake fragment until the certificate expires.

This is remotely reachable by a network peer and can crash applications exposing a libp2p QUIC listener.

Details

During the TLS handshake, libp2p-tls parses and validates the peer certificate. After Quinn reports handshake completion, libp2p-quic re-parses the same certificate in the post-handshake upgrade path and assumes this cannot fail:

https://github.com/libp2p/rust-libp2p/blob/969b707bf1177ebebd1febc285c3fd22793b95c5/transports/quic/src/connection/connecting.rs#L65-L66

However, libp2p_tls::certificate::parse() re-runs certificate verification on every call, including a wall-clock validity check. A certificate that was valid during the first handshake time parse can expire before the second post-handshake parse, causing the expect(...) to panic.

PoC

A malicious peer can trigger this by:

1. Opening a QUIC connection to a libp2p QUIC listener.
2. Presenting a valid libp2p TLS certificate with a very short lifetime.
3. Allowing the initial handshake-time certificate validation to succeed.
4. Withholding the final client handshake fragment packet until after the certificate expires, but before the QUIC handshake timeout elapses.
5. The listener completes the handshake and hits the post-handshake certificate re-parse, which panics.

Impact

Remote unauthenticated denial of service. Any application exposing an affected libp2p-quic listener can be crashed by a network peer that performs a valid-looking QUIC/TLS handshake with attacker-controlled timing. No malformed packets are required.

libp2p-rust is the official Rust language implementation of the libp2p networking stack. Prior to 0.13.1, libp2p-quic could panic during an inbound QUIC handshake when a remote peer presented a valid short-lived libp2p TLS certificate and delayed the final TLS 1.3 handshake fragment until after the certificate expired. In the Quinn post-handshake upgrade path, transports/quic/src/connection/connecting.rs called libp2p_tls::certificate::parse a second time in remote_peer_id and used expect on the result. The repeated wall-clock validity check could reject the now-expired certificate, causing the expect call to terminate any application exposing an affected libp2p-quic listener. This vulnerability is fixed in 0.13.1.

libp2p-rust is the official Rust language implementation of the libp2p networking stack. Prior to 0.13.1, libp2p-quic could panic during an inbound QUIC handshake when a remote peer presented a valid short-lived libp2p TLS certificate and delayed the final TLS 1.3 handshake fragment until after the certificate expired. In the Quinn post-handshake upgrade path, transports/quic/src/connection/connecting.rs called libp2p_tls::certificate::parse a second time in remote_peer_id and used expect on the result. The repeated wall-clock validity check could reject the now-expired certificate, causing the expect call to terminate any application exposing an affected libp2p-quic listener. This vulnerability is fixed in 0.13.1.

Summary

libp2p-quic can panic on an inbound QUIC handshake if a malicious peer presents a valid, short lived libp2p TLS certificate and delays the final TLS 1.3 handshake fragment until the certificate expires.

This is remotely reachable by a network peer and can crash applications exposing a libp2p QUIC listener.

Details

During the TLS handshake, libp2p-tls parses and validates the peer certificate. After Quinn reports handshake completion, libp2p-quic re-parses the same certificate in the post-handshake upgrade path and assumes this cannot fail:

https://github.com/libp2p/rust-libp2p/blob/969b707bf1177ebebd1febc285c3fd22793b95c5/transports/quic/src/connection/connecting.rs#L65-L66

However, libp2p_tls::certificate::parse() re-runs certificate verification on every call, including a wall-clock validity check. A certificate that was valid during the first handshake time parse can expire before the second post-handshake parse, causing the expect(...) to panic.

PoC

A malicious peer can trigger this by:

1. Opening a QUIC connection to a libp2p QUIC listener.
2. Presenting a valid libp2p TLS certificate with a very short lifetime.
3. Allowing the initial handshake-time certificate validation to succeed.
4. Withholding the final client handshake fragment packet until after the certificate expires, but before the QUIC handshake timeout elapses.
5. The listener completes the handshake and hits the post-handshake certificate re-parse, which panics.

Impact

Remote unauthenticated denial of service. Any application exposing an affected libp2p-quic listener can be crashed by a network peer that performs a valid-looking QUIC/TLS handshake with attacker-controlled timing. No malformed packets are required.

libp2p-rust is the official Rust language implementation of the libp2p networking stack. Prior to 0.13.1, libp2p-quic could panic during an inbound QUIC handshake when a remote peer presented a valid short-lived libp2p TLS certificate and delayed the final TLS 1.3 handshake fragment until after the certificate expired. In the Quinn post-handshake upgrade path, transports/quic/src/connection/connecting.rs called libp2p_tls::certificate::parse a second time in remote_peer_id and used expect on the result. The repeated wall-clock validity check could reject the now-expired certificate, causing the expect call to terminate any application exposing an affected libp2p-quic listener. This vulnerability is fixed in 0.13.1.