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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).

PUBLISHED Reserved 2026-04-17 | Published 2026-04-17 | Updated 2026-04-20 | Assigner redhat




HIGH: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Problem types

Out-of-bounds Write

Product status

Default status
unaffected

Default status
unaffected

Default status
unaffected

Default status
unaffected

Default status
unaffected

Default status
affected

Timeline

2026-04-17:Reported to Red Hat.
2026-04-17:Made public.

References

access.redhat.com/security/cve/CVE-2026-6507 vdb-entry

bugzilla.redhat.com/show_bug.cgi?id=2459181 (RHBZ#2459181) issue-tracking

cve.org (CVE-2026-6507)

nvd.nist.gov (CVE-2026-6507)

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