What’s Vulnerable › Vulnerabilities

CVE-2026-61544: libp2p-quic: Remote panic via certificate expiry race during QUIC handshake

• Severity: high (CVSS 8.2 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-15 · updated 2026-09-30
• Weakness: CWE-248

Description

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.

Affected products

• libp2p js-libp2p: before 0.13.1

References

• https://github.com/libp2p/rust-libp2p/commit/212f3774af048e2cecfb2e6b1e08477685e52b22
• https://github.com/libp2p/rust-libp2p/commit/e8f35e12c2418b04df6e9cdf036005e8aee3c7a2
• https://github.com/libp2p/rust-libp2p/pull/6525
• https://github.com/libp2p/rust-libp2p/security/advisories/GHSA-5hq8-qhww-jm7q
• https://github.com/libp2p/rust-libp2p/security/advisories/GHSA-5hq8-qhww-jm7q

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