'max-global-quota' reset by DNSSEC validation restarts
CVE-2026-50045 is fixed in unbound on 1 platform, first by DEBIAN-CVE-2026-50045, released July 28, 2026. It is not reported as exploited. Patch Radar priority: Routine.
In NLnet Labs Unbound 1.22.0 up to and including 1.25.1, a single client query for a deeply nested name under a DNSSEC-signed parent can cause Unbound to send more upstream packets per client query than the configured 'max-global-quota'. This effectively bypasses a security configuration that limits upstream amplification traffic.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| unbound · Debian 13.5 (trixie) | 1.26.1-0+deb13u1 | DEBIAN-CVE-2026-50045 | Jul 28, 2026 |
| unbound · Debian 14 | 1.25.2-1 | DEBIAN-CVE-2026-50045 | Jul 28, 2026 |
| unbound · opensuse-leap 16.0 | 1.25.2-160000.1.1 | OPENSUSE-SU-2026:21550-1 | Aug 10, 2026 |
| unbound · sles 16.0 | 1.25.2-160000.1.1 | SUSE-SU-2026:23226-1 | Aug 10, 2026 |
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