Medium [CVE-2026-19931] Information disclosure via incorrect connection reuse with Negotiate authentication
This medium-severity Red Hat Linux advisory covers CVE-2026-19931; related products: Red Hat Hardened Images, Confidential Compute Attestation, Red Hat Enterprise Linux 10.
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Summary
Information disclosure via incorrect connection reuse with Negotiate authentication. Red Hat rates this moderate (CVSS 6.5).
Weakness: CWE-488. Red Hat lists fixing advisory RHSA-2026:63161 with package curl-main-8.22.0-0.1.hum1, rust-main-1.98.0-1.hum1.
Affected products named by the advisory: Red Hat Hardened Images; Confidential Compute Attestation; Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 9; and 9 more.
Affected products named by the advisory: Red Hat Enterprise Linux AI (RHEL AI) 3; Red Hat OpenShift Container Platform 4; Red Hat OpenShift Dev Spaces; Red Hat Satellite 6; and 5 more.
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 14 days ago·verify at source
- curl-main-8.22.0-0.1.hum1
- rust-main-1.98.0-1.hum1
- RHSA-2026:63161
Official advisory · high-confidence parse· fetched 14 days ago·verify at source
Mitigation checklist
- To mitigate this prevent connection reuse (CURLOPT_FORBID_REUSE) for transfers using Negotiate authentication with empty credentials and strictly isolate libcurl connection pools across different security principals. For defense-in-depth, enforce network boundaries to limit outbound HTTP access, mitigating the impact of any potential cross-session data exposure while pending upstream patches.
Official advisory · high-confidence parse· fetched 14 days ago·verify at source
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