Information Exposure Affecting curl package, versions <0:8.21.0-0.1.hum1


Severity

Recommended
medium

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.4% (33rd percentile)

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  • Snyk IDSNYK-RHEL10-CURL-17873941
  • published7 Jul 2026
  • disclosed3 Jul 2026

Introduced: 3 Jul 2026

CVE-2026-9546  (opens in a new tab)
CWE-201  (opens in a new tab)

How to fix?

Upgrade RHEL:10 curl to version 0:8.21.0-0.1.hum1 or higher.
This issue was patched in RHSA-2026:29017.

NVD Description

Note: Versions mentioned in the description apply only to the upstream curl package and not the curl package as distributed by RHEL. See How to fix? for RHEL:10 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