Medium [CVE-2026-4893] Broken ECS source validation bypass
This medium-severity Red Hat Linux advisory covers CVE-2026-4893 affecting Red Hat Enterprise Linux 9, Red Hat Enterprise Linux 1, Red Hat Enterprise Linux 8.
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Summary
Broken ECS source validation bypass. Red Hat rates this moderate (CVSS 6.5).
Weakness: CWE-20. Affected package(s): dnsmasq.
Resolved in Red Hat advisory RHSA-2026:20589 — update the affected packages (`sudo dnf update`).
Affected products named by the advisory: Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 1; Red Hat Enterprise Linux 8.
- dnsmasq-0:2.85-17.el9_6.1
- dnsmasq-0:2.90-7.el10_2
- dnsmasq-0:2.85-18.el9_8.1
- dnsmasq-0:2.79-36.el8_10
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
- RHSA-2026:20589
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
Mitigation checklist
- Update the affected package(s) to the fixed version shipped in RHSA-2026:20589 (`sudo dnf update` / `yum update`).
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
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