PT-2026-63379 · Nlnet · Unbound

Kunjie Shang · CVE-2026-50045 · Published 2026-07-22 · Updated 2026-07-22

NVD

CVSS v3.1

5.3

Medium

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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.

Fix

Weakness Enumeration

CWE-406

Related Identifiers

CVE-2026-50045

Affected Products

Unbound

References · 2

• https://nlnetlabs.nl/downloads/unbound/CVE-2026-50045.txt · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-50045 · Security Note