Medium [CVE-2026-11564] Certificate validation bypass due to incorrect connection reuse
This medium-severity Red Hat Linux advisory covers CVE-2026-11564 affecting Red Hat Hardened Images, Confidential Compute Attestation, Red Hat Enterprise Linux 10.
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Summary
libcurl keeps previously used connections in a connection pool for subsequent transfers to reuse if one of them matches the setup. An easy handle that first uses default native CA trust can continue trusting the native platform store after the application switches that same handle to custom CA material for a later transfer.
A flaw was found in curl. When libcurl reuses a connection from its connection pool, an easy handle that initially used default native Certificate Authority (CA) trust may continue to trust the native platform store.
This occurs even after the application has switched that same handle to custom CA material for a subsequent transfer, potentially bypassing intended certificate validation. This Moderate flaw in curl allows a certificate validation bypass.
Red Hat severity: Moderate — CVSS 6.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N). Weakness: CWE-295.
Affected Red Hat products: Red Hat Hardened Images; Confidential Compute Attestation; Red Hat Enterprise Linux 10; Red Hat Enterprise Linux AI (RHEL AI) 3; Red Hat OpenShift Container Platform 4.
Red Hat lists Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat JBoss Core Services; Red Hat OpenShift Dev Spaces; Red Hat Trusted Profile Analyzer as not affected.
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 22 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 22 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 22 days ago·verify at source
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