Infinite loop Affecting dnsmasq package, versions [,2.93)
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-DNSMASQ-16675141
- published14 May 2026
- disclosed9 May 2026
- creditRoyce M
Introduced: 9 May 2026
CVE-2026-4890 (opens in a new tab)How to fix?
Upgrade dnsmasq to version 2.93 or higher.
Overview
Affected versions of this package are vulnerable to Infinite loop in the NSEC and NSEC3 bitmap parsing process when DNSSEC validation is enabled. An attacker can cause the service to enter an infinite loop and become unresponsive by sending a specially crafted DNS response with a zero-length bitmap. This is only exploitable if DNSSEC validation is enabled (--dnssec).