CVE-2026-96405 Affecting unbound-libs package, versions <0:1.17.1-1.amzn2023.0.17
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-UNBOUNDLIBS-21705097
- published25 Oct 2026
- disclosed21 Oct 2026
Introduced: 21 Oct 2026
NewCVE-2026-96405 (opens in a new tab)How to fix?
Upgrade Amazon-Linux:2023 unbound-libs to version 0:1.17.1-1.amzn2023.0.17 or higher.
This issue was patched in ALAS2023-2026-3313.
NVD Description
Note: Versions mentioned in the description apply only to the upstream unbound-libs package and not the unbound-libs package as distributed by Amazon-Linux.
See How to fix? for Amazon-Linux:2023 relevant fixed versions and status.
NLnet Labs Unbound up to and including version 1.26.1 limits compression-pointer traversal for each individual domain-name operation but has no aggregate inbound decompression-work budget. Many chained compression pointers in a message results in a lot of CPU usage following them. A malicious actor with recursive-query access and control of an ordinarily delegated authority that serves specially crafted replies can exploit the vulnerability and degrade Unbound's general performance.