Integer Overflow or Wraparound Affecting bind package, versions [9.11.0,9.19.0)[9.20.0,9.20.29)[9.21.0,9.21.26)
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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- published24 Sept 2026
- disclosed16 Sept 2026
- creditUnknown
Introduced: 16 Sep 2026
NewCVE-2026-19667 (opens in a new tab)How to fix?
Upgrade bind to version 9.19.0, 9.20.29, 9.21.26 or higher.
Overview
Affected versions of this package are vulnerable to Integer Overflow or Wraparound in the named process when handling a precisely sized negative DNS answer from an attacker-controlled authoritative server. An attacker can cause service disruption by sending a specially crafted DNS negative response that triggers a 16-bit length truncation, resulting in a zero-byte negative cache entry and subsequent process termination. This is only exploitable if the instance is configured as a recursive resolver that queries untrusted authoritative servers.
Workaround
This vulnerability can be mitigated by configuring the service to forward all DNS queries to trusted, non-vulnerable upstream DNS servers, preventing direct interaction with potentially malicious authoritative servers.