High7.5Red Hat & Ubuntu Linux
NSEC bitmap parsing infinite loop
CVE-2026-4890 Published May 9, 2026
CVE-2026-4890
Affected products & platforms
Red Hat & Ubuntu LinuxUnclassified
Summary
NSEC bitmap parsing infinite loop. Red Hat rates this important (CVSS 7.5). Weakness: CWE-835. Affected package(s): dnsmasq. Resolved in Red Hat advisory RHSA-2026:20589 — update the affected packages (`sudo dnf update`).
Affected versions
- 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 hours ago·verify at source
Fixed versions
- RHSA-2026:20589
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Mitigation checklist
Recommended fix / mitigation
- 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 hours ago·verify at source
Discussion(0)
No comments yet. Share field notes, upgrade gotchas, or questions — verify against the vendor advisory before acting on community advice.
Sign in to join the discussion.