Use of Cache Containing Sensitive Information Affecting pdns-recursor package, versions [5.2.0,5.2.11)[5.3.0,5.3.8)[5.4.0,5.4.3)
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-PDNSRECURSOR-17660840
- published28 Jun 2026
- disclosed25 Jun 2026
- creditDanial Mahadzir
Introduced: 25 Jun 2026
CVE-2026-40012 (opens in a new tab)How to fix?
Upgrade pdns-recursor to version 5.2.11, 5.3.8, 5.4.3 or higher.
Overview
Affected versions of this package are vulnerable to Use of Cache Containing Sensitive Information in the packet cache process. An attacker can obtain sensitive information by sending crafted queries that exploit the improper caching of ECS zero scoped answers. This is only exploitable if ECS is enabled in the configuration.