# CVE-2025-59530

## Summary

- **CVE ID:** CVE-2025-59530
- **Severity:** HIGH
- **CVSS Score:** 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
- **CWE:** CWE-617, CWE-755
- **Published:** Oct 10, 2025
- **Last Modified:** Mar 13, 2026

## 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.

## Affected Products

- quic-go — quic-go (< 0.49.1)
- quic-go — quic-go (>= 0.5.0, < 0.54.1)

## References

- [CNA](https://github.com/quic-go/quic-go/security/advisories/GHSA-47m2-4cr7-mhcw)
- [CNA](https://github.com/quic-go/quic-go/pull/5354)
- [CNA](https://github.com/quic-go/quic-go/blob/v0.55.0/connection.go#L2682-L2685)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.44%
- **EPSS Percentile:** 36.8

---
_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._