Buffer overflow in Dnsmasq
CVE-2026-4892
A heap-based out-of-bounds write vulnerability in the DHCPv6 implementation of dnsmasq allows local attackers to execute arbitrary code with root privileges via a crafted DHCPv6 packet.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.4 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.003 (20.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 21st percentile — 20.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.008 · newest: 0.003 · change: -0.005
Affected products
- Dnsmasq — versions 0, 2.93, 2.92rel2
Weakness classification (CWE)
References
- thekelleys.org.uk/dnsmasq/
- www.kb.cert.org/vuls/id/471747
- lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.html
- thekelleys.org.uk/dnsmasq/CVE/
- github.com/NixOS/nixpkgs/pull/519082
- github.com/NixOS/nixpkgs/pull/519093
- github.com/pi-hole/FTL/releases/tag/v6.6.2
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Frequently asked questions
- What is CVE-2026-4892?
- CVE-2026-4892 is a high-severity vulnerability in Dnsmasq, classified under Heap-based Buffer Overflow. CVSS score: 8.4/10. Published 2026-05-11.
- How severe is CVE-2026-4892?
- High severity. CVSS v3 base score is 8.4 out of 10.