# CVE-2025-64702: golang-github-lucas-clemente-quic-go: quic-go is an implementation of the QUIC protocol in Go

CVE-2025-64702 is fixed in 5 products on 1 platform, first by DEBIAN-CVE-2025-64702, released December 11, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2025-64702
- Priority: Routine
- CVSS: 5.3 (medium)
- EPSS: 0.0092
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Dec 11, 2025

## Description

quic-go is an implementation of the QUIC protocol in Go. Versions 0.56.0 and below are vulnerable to excessive memory allocation through quic-go's HTTP/3 client and server implementations by sending a QPACK-encoded HEADERS frame that decodes into a large header field section (many unique header names and/or large values). The implementation builds an http.Header (used on the http.Request and http.Response, respectively), while only enforcing limits on the size of the (QPACK-compressed) HEADERS frame, but not on the decoded header, leading to memory exhaustion. This issue is fixed in version 0.57.0.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | caddy Fedora 43 | 2.10.2-9.fc43 | [FEDORA-2026-3DC324BD9A](https://patchblox.com/security/data/fix/linux/fedora-2026-3dc324bd9a.md) | Jun 23, 2026 |
| Linux | caddy-debuginfo Fedora 43 | 2.10.2-9.fc43 | [FEDORA-2026-3DC324BD9A](https://patchblox.com/security/data/fix/linux/fedora-2026-3dc324bd9a.md) | Jun 23, 2026 |
| Linux | caddy-debugsource Fedora 43 | 2.10.2-9.fc43 | [FEDORA-2026-3DC324BD9A](https://patchblox.com/security/data/fix/linux/fedora-2026-3dc324bd9a.md) | Jun 23, 2026 |
| Linux | golang-github-lucas-clemente-quic-go Debian 14 | 0.59.0-1 | [DEBIAN-CVE-2025-64702](https://patchblox.com/security/data/fix/linux/debian-cve-2025-64702.md) | Dec 11, 2025 |
| Linux | govulncheck-vulndb opensuse-leap 15.6 | 0.0.20251230T014957-150000.1.134.1 | [SUSE-SU-2026:0037-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0037-1.md) | Jan 6, 2026 |
| Linux | govulncheck-vulndb opensuse-leap 16.0 | 0.0.20260723T184607-160000.1.1 | [OPENSUSE-SU-2026:21483-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21483-1.md) | Jul 30, 2026 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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