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High severity7.5OSV Advisory· Published Oct 10, 2025· Updated Apr 15, 2026

CVE-2025-59530

CVE-2025-59530

Description

quic-go is an implementation of the QUIC protocol in Go. In versions prior to 0.49.0, 0.54.1, and 0.55.0, a misbehaving or malicious server can cause a denial-of-service (DoS) attack on the quic-go client by triggering an assertion failure, leading to a process crash. This requires no authentication and can be exploited during the handshake phase. This was observed in the wild with certain server implementations. quic-go needs to be able to handle misbehaving server implementations, including those that prematurely send a HANDSHAKE_DONE frame. Versions 0.49.0, 0.54.1, and 0.55.0 discard Initial keys when receiving a HANDSHAKE_DONE frame, thereby correctly handling premature HANDSHAKE_DONE frames.

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
github.com/quic-go/quic-goGo
< 0.49.10.49.1
github.com/quic-go/quic-goGo
>= 0.50.0, < 0.54.10.54.1

Affected products

194

Patches

Vulnerability mechanics

References

8

News mentions

0

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