CVE-2026-50045: medium-severity vulnerability in NLnet Labs Unbound
'max-global-quota' reset by DNSSEC validation restarts
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 5.3epss 0.5%
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Affected products
NLnet Labs · UnboundRelated CVEs — NLnet Labs Unbound
In the same product, most dangerous first.
CVE-2024-1931HIGHDenial of service when trimming EDE text on positive repliesEPSS 2.5%CVE-2022-3204HIGHNRDelegation AttackEPSS 1.6%CVE-2026-33278CRITICALPossible arbitrary code execution during DNSSEC validationEPSS 1.4%CVE-2022-30699—Novel "ghost domain names" attack by updating almost expired delegation informationEPSS 1.2%CVE-2022-30698—Novel "ghost domain names" attack by introducing subdomain delegationsEPSS 1.2%CVE-2026-81642CRITICALHeap buffer overflow and possible Remote Code Execution when digesting DNSKEYEPSS 1.0%