Improper Verification of Cryptographic Signature Affecting pdns-recursor package, versions [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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- published28 Jun 2026
- disclosed25 Jun 2026
- creditVitaly Simonovich
Introduced: 25 Jun 2026
CVE-2026-42390 (opens in a new tab)How to fix?
Upgrade pdns-recursor to version 5.4.3 or higher.
Overview
Affected versions of this package are vulnerable to Improper Verification of Cryptographic Signature in the ZONEMD validation process. An attacker can cause an invalid zone to be accepted as valid by bypassing the intended validation checks. This is only exploitable if ZoneToCache is configured with ZONEMD validation.