Misinterpretation of Input 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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- published27 Jun 2026
- disclosed25 Jun 2026
- creditUnknown
Introduced: 25 Jun 2026
CVE-2026-42004 (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 Misinterpretation of Input via the handling of EDNS OPT records. An attacker can bypass filtering rules by sending specially crafted EDNS options that are ignored during initial processing but are rewritten as valid options when EDNS Client Subnet is inserted, allowing unfiltered options to reach the backend.