Access of Uninitialized Pointer Affecting unbound package, versions [,1.25.1)
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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- published22 May 2026
- disclosed20 May 2026
- creditQifan Zhang
Introduced: 20 May 2026
CVE-2026-42959 (opens in a new tab)How to fix?
Upgrade unbound to version 1.25.1 or higher.
Overview
Affected versions of this package are vulnerable to Access of Uninitialized Pointer in the DNSSEC validation while calculating write offsets for ADDITIONAL section rrsets when constructing chase-reply messages. An attacker can cause the resolver process to crash by sending a specially crafted DNS query that triggers dereference of an uninitialized pointer due to incorrect write offset calculation.