7.5

CVE-2026-6507: dnsmasq Out-of-bounds Write

CVSS: 7.5v3.1HighAwaiting analysis
AliasesUBUNTU-CVE-2026-6507USN-8308-1DEBIAN-CVE-2026-6507
Published 17-04-2026Last modified 01-09-2026
Open JSON

Vulnerability summary

CVE-2026-6507 is a high (CVSS 7.5) Out-of-bounds Write vulnerability in dnsmasq. EPSS estimates a 0.58% chance of exploitation in the next 30 days, higher than 47% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.58%
0%100%
Low · +0.10 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 4 · Related 5
OPENSUSE-SU-2026:21192-1SUSE-SU-2026:22454-1SUSE-SU-2026:22496-1SUSE-SU-2026:2458-1CGA-G87V-HGPM-QF9M

Timeline

  1. 17-04-2026
    PublishedVulnerability first disclosed.
  2. 01-09-2026
    Last modifiedVulnerability information updated.

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 metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.58%

Chance of exploitation in the next 30 days

Percentile

47%

Versus all other CVEs

30-day change

+0.10 pp

From 0.48% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.58%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Chainguard2 products
  • dnsmasq< 2.93-r0
  • dnsmasq-doc< 2.93-r0
Wolfi2 products
  • dnsmasq< 2.93-r0
  • dnsmasq-doc< 2.93-r0
Debian1 product
  • dnsmasq< 2.92-4
Opensuse1 product
  • dnsmasq&distro=openSUSE Tumbleweed< 2.92-3.1
Ubuntu1 product
  • dnsmasq< 2.92-1ubuntu0.3

5 vendors · 7 products

References

7 links