CVE-2026-93009
Medium
Description
A flaw was found in dnsmasq. The DHCPv6 client hostname parser can read one byte past the end of a crafted FQDN option because it checks the next label length before confirming the pointer is still inside the option. An attacker on the local network can trigger this with a single DHCPv6 packet. The extra byte is not returned to the client or logged, and no crash has been demonstrated.
SeverityMedium
CVSS4.3
Exploit probability—
Product
Microsoft Azl3 Dnsmasq
PublishedOct 29, 2026
First seenNov 4, 2026
Weakness typeCWE-125Out-of-bounds read
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| microsoft azl3_dnsmasq_2.93-1 | No range specified | — |
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