Missing Release of Resource after Effective Lifetime Affecting dnsdist package, versions [,1.9.15)[2.0.0,2.0.7)
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-UNMANAGED-DNSDIST-17660701
- published27 Jun 2026
- disclosed25 Jun 2026
- creditUnknown
Introduced: 25 Jun 2026
CVE-2026-40209 (opens in a new tab)How to fix?
Upgrade dnsdist to version 1.9.15, 2.0.7 or higher.
Overview
Affected versions of this package are vulnerable to Missing Release of Resource after Effective Lifetime via the IXFR query handling process. An attacker can exhaust available backend TCP connections or file descriptors by sending specially crafted IXFR queries, causing outgoing TCP connections to remain open until timeout and preventing legitimate requests from being processed.