Allocation of Resources Without Limits or Throttling in Unbound - CVE-2026-50045
Published: July 23, 2026
Vulnerability identifier: #VU139232
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-50045
CWE-ID: CWE-770
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: NLnet Labs
Affected software:
Unbound
Unbound
Detailed vulnerability description
The vulnerability allows a remote attacker to bypass upstream amplification traffic limits.
The vulnerability exists due to improper resource management in the DNSSEC validator when processing a single client query for a deeply nested name under a DNSSEC-signed parent. A remote attacker can send a specially crafted query to bypass upstream amplification traffic limits.
How to mitigate CVE-2026-50045
Install security update from vendor's website.