High [CVE-2026-9546] Information disclosure due to persistent Referer header
This high-severity Red Hat Linux advisory covers CVE-2026-9546 affecting Red Hat Hardened Images.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
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Summary
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. A flaw was found in libcurl.
Important: A flaw in libcurl allows for sensitive information disclosure. Despite attempts to explicitly clear the HTTP Referer header, its internal state persists, leading to the unintended reuse and transmission of previous referrer strings in subsequent requests.
This could expose sensitive data to unintended third-party servers in Red Hat products and services that rely on libcurl for HTTP communications. Red Hat severity: Moderate — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N).
Weakness: CWE-201. Affected Red Hat products: Red Hat Hardened Images.
Under investigation: Confidential Compute Attestation; Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 9; Red Hat Enterprise Linux AI (RHEL AI) 3; Red Hat OpenShift Container Platform 4; Red Hat OpenShift Dev Spaces; Red Hat Trusted Profile Analyzer.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 20 days ago·verify at source
- curl-main-8.21.0-0.1.hum1
- rust-main-1.96.1-1.hum1
- RHSA-2026:29017
- RHSA-2026:34975
Official advisory · high-confidence parse· fetched 20 days ago·verify at source
Mitigation checklist
- Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Official advisory · high-confidence parse· fetched 20 days ago·verify at source
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