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Vulnerability record · CVE-2026-6507 · published 17 April 2026

CVE-2026-6507: Out-of-bounds write vulnerability

A flaw was found in dnsmasq. A remote attacker could exploit an out-of-bounds write vulnerability by sending a specially crafted BOOTREPLY (Bootstrap Protocol Reply) packet to a dnsmasq server configured with the `--dhcp-split-relay` option. This can lead to memory corruption, causing the dnsmasq daemon to crash and resulting in a denial of service (DoS).

7.5 CVSS 3.1 High EPSS 0.58% · top 54.4% CWE-787 · Out-of-bounds write Awaiting Analysis
7.5CVSS 3.1 base score
0.58%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
1 Sep 2026Last modified by NVD

Description

A flaw was found in dnsmasq. A remote attacker could exploit an out-of-bounds write vulnerability by sending a specially crafted BOOTREPLY (Bootstrap Protocol Reply) packet to a dnsmasq server configured with the `--dhcp-split-relay` option. This can lead to memory corruption, causing the dnsmasq daemon to crash and resulting in a denial of service (DoS).

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

LinkTags
https://access.redhat.com/security/cve/CVE-2026-6507
https://bugzilla.redhat.com/show_bug.cgi?id=2459181

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-6507), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.