Heap-based Buffer Overflow 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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- published14 May 2026
- disclosed9 May 2026
- creditAsim Viladi Oglu Manizada, Royce M
Introduced: 9 May 2026
CVE-2026-4892 (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 Heap-based Buffer Overflow in the helper process when processing DHCPv6 client identifiers, due to hex-encoding attacker-controlled content into a fixed-size buffer without proper length validation. An attacker can achieve arbitrary code execution as root by sending specially crafted DHCPv6 packets from a malicious VM guest within the virtual network. This is only exploitable if the --dhcp-script option is enabled, which is the default in libvirt virtual network configurations on affected systems.