High8.2Red Hat & Ubuntu Linux
Authentication bypass via unsanitized alias headers
CVE-2026-39858 Published Apr 30, 2026
CVE-2026-39858
Affected products & platforms
Red Hat & Ubuntu LinuxUnclassified
Summary
Authentication bypass via unsanitized alias headers. Red Hat rates this important (CVSS 8.2). Weakness: CWE-289. Affected package(s): devspaces/traefik-rhel9:1779786779. Resolved in Red Hat advisory RHSA-2026:21772 — update the affected packages (`sudo dnf update`).
Affected versions
- devspaces/traefik-rhel9:1779786779
Official advisory · high-confidence parse· fetched 1 day ago·verify at source
Fixed versions
- RHSA-2026:21772
Official advisory · high-confidence parse· fetched 1 day ago·verify at source
Mitigation checklist
Recommended fix / mitigation
- Update the affected package(s) to the fixed version shipped in RHSA-2026:21772 (`sudo dnf update` / `yum update`).
Official advisory · high-confidence parse· fetched 1 day ago·verify at source
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