CVE-2026-9546 Affecting curl package, versions <8.22.0-r0


Severity

Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.65% (50th percentile)

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  • Snyk IDSNYK-ALPINE323-CURL-19533365
  • published5 Sept 2026
  • disclosed3 Jul 2026

Introduced: 3 Jul 2026

CVE-2026-9546  (opens in a new tab)

How to fix?

Upgrade Alpine:3.23 curl to version 8.22.0-r0 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream curl package and not the curl package as distributed by Alpine. See How to fix? for Alpine:3.23 relevant fixed versions and status.

A vulnerability in libcurl caused the HTTP Referer: header to persist even when explicitly cleared. While the documentation states that passing NULL to CURLOPT_REFERER suppresses the header, the option failed to clear the internal state. As a result, the previous referrer string was erroneously reused and sent in subsequent requests, potentially leaking sensitive information to unintended servers.

CVSS Base Scores

version 3.1