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.
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| NLnet Labs | Unbound | unaffected |
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Project Subscriptions
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Advisories
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Fixes
Solution
This issue is fixed starting with version 1.25.2
Workaround
No workaround given by the vendor.
References
History
Wed, 22 Jul 2026 13:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Title | 'max-global-quota' reset by DNSSEC validation restarts | |
| Weaknesses | CWE-406 | |
| References |
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| Metrics |
cvssV3_1
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Projects
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MITRE
Status: PUBLISHED
Assigner: NLnet Labs
Published:
Updated: 2026-07-22T13:07:55.730Z
Reserved: 2026-06-22T12:27:22.806Z
Link: CVE-2026-50045
Vulnrichment
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NVD
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Redhat
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OpenCVE Enrichment
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Weaknesses