Buffer Access with Incorrect Length Value Affecting unbound package, versions [1.23.0,1.25.2)
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-UNBOUND-18507931
- published2 Aug 2026
- disclosed22 Jul 2026
- creditUnknown
Introduced: 22 Jul 2026
NewCVE-2026-55973 (opens in a new tab)How to fix?
Upgrade unbound to version 1.25.2 or higher.
Overview
Affected versions of this package are vulnerable to Buffer Access with Incorrect Length Value via the dns-error-reporting option when it is explicitly enabled. An attacker can cause the daemon to terminate by sending a specially crafted DNS response containing a malformed EDNS Report-Channel option from a delegated zone they control. This is only exploitable if the dns-error-reporting option is set to 'yes'.