---
title: "github.com/klauspost/compress — CVE-2026-63209"
description: "A denial of service flaw affects the Go package github.com/klauspost/compress. Affected versions: <= 1.18.6. Fixed from version 1.18.7. CVSS score 7.5."
canonical: https://inyourgeek.com/en/failles-de-securite/2026-10-20-cve-2026-63209
type: faille-de-securite
author: "Sébastien Soulier"
publisher: "InYourGeek"
language: en
datePublished: 2026-10-20
dateModified: 2026-10-20
---
# github.com/klauspost/compress — CVE-2026-63209

A denial of service flaw affects the Go package github.com/klauspost/compress. Affected versions: <= 1.18.6. Fixed from version 1.18.7. CVSS score 7.5.

## What to do

Update github.com/klauspost/compress to 1.18.7 or later.

| Fact | Value |
| --- | --- |
| Package | github.com/klauspost/compress |
| Ecosystem | Go modules |
| Class | Denial of service |
| Affected versions | <= 1.18.6 |
| Fixed version | 1.18.7 |
| CVSS | 7.5 |
| CVE | CVE-2026-63209 |
| GHSA | GHSA-259r-337f-4rfw |
| Published on | October 20, 2026 |
| Severity | High |

## Sources

- [GitHub Security Advisory — GHSA-259r-337f-4rfw](https://github.com/advisories/GHSA-259r-337f-4rfw) — GitHub Security Advisories
- [NVD — CVE-2026-63209](https://nvd.nist.gov/vuln/detail/CVE-2026-63209) — NVD

---

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