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CVE-2026-50045

'max-global-quota' reset by DNSSEC validation restarts

MEDIUM
5.3
CVSS Score
Published: July 22, 2026 at 01:07 PM UTC
Updated: October 24, 2026 at 01:10 PM UTC
1 product affected across 1 vendorUnbound

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Severity
MEDIUM5.3
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Unbound· Nlnetlabs
95%
1.22.0 ≤ v < 1.25.21.22.0
Affected range stops below 1.25.2, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor Advisory
Source: cverecord
https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-50045.txt

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.3MEDIUMNLnet Labs
Vector?

Quick Info

StatusANALYZED
CWE
CWE-406

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