Incorrect Calculation of Buffer Size 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.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-UNMANAGED-DNSMASQ-16674861
- published14 May 2026
- disclosed9 May 2026
- creditHugo Martinez, Andrew Fasano, Royce M, Mattia Ricciardi
Introduced: 9 May 2026
CVE-2026-2291 (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 Incorrect Calculation of Buffer Size in the cache process when expanding certain characters in DNS responses into escape sequences. An attacker can cause a process crash or manipulate DNS cache records by sending specially crafted DNS responses. This is only exploitable if the system is configured to forward DNS queries directly to an attacker-controlled server, bypassing standard upstream DNS resolvers.