CVE-2026-50248 Affecting unbound-debugsource package, versions <0:1.17.1-1.amzn2023.0.13
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-AMZN2023-UNBOUNDDEBUGSOURCE-18532168
- published5 Aug 2026
- disclosed22 Jul 2026
Introduced: 22 Jul 2026
NewCVE-2026-50248 (opens in a new tab)How to fix?
Upgrade Amazon-Linux:2023 unbound-debugsource to version 0:1.17.1-1.amzn2023.0.13 or higher.
This issue was patched in ALAS2023-2026-2033.
NVD Description
Note: Versions mentioned in the description apply only to the upstream unbound-debugsource package and not the unbound-debugsource package as distributed by Amazon-Linux.
See How to fix? for Amazon-Linux:2023 relevant fixed versions and status.
In NLnet Labs Unbound 1.7.0 up to and including 1.25.1, when an auth/rpz zone has a configured primary hostname that resolves to BOGUS A/AAAA, it is still considered as a possible XFR endpoint. A malicious actor that can spoof the hostname's A/AAAA record (no valid RRSIG required) becomes the zone's XFR primary and can replaces the entire zone/the resolver's entire response policy.