Bug 2506136 (CVE-2026-50045) - CVE-2026-50045 unbound: Unbound: Denial of Service via DNSSEC query amplification bypass
Summary: CVE-2026-50045 unbound: Unbound: Denial of Service via DNSSEC query amplifica...
Keywords:
Status: NEW
Alias: CVE-2026-50045
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-07-22 14:01 UTC by OSIDB Bzimport
Modified: 2026-08-10 09:18 UTC (History)
2 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)

Description OSIDB Bzimport 2026-07-22 14:01:59 UTC 
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.
Note You need to log in before you can comment on or make changes to this bug.