CVE-2026-13002

Dnsmasq: infinite loop dos in dnssec nsec/nsec3 type bitmap parsing

CVE-2026-13002 is fixed in 5 products on 1 platform, first by ALAS2023-2026-1729, released May 25, 2026. It is not reported as exploited. Patch Radar priority: Routine.

Routine

CVSS

4.4

Moderate

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

n/a

A flow has been identified into dnssec.c library, causing an infinite loop to dnsmasq service. An attacker who controls any DNSSEC-signed zone can hang the dnsmasq process with a single crafted response, killing all DNS resolution for its clients.

Where it's fixed

Product	Fixed in	Fix	Released
Linux
dnsmasq · amzn 2023	2.90-1.amzn2023.0.3	ALAS2023-2026-1729	May 25, 2026
dnsmasq-debuginfo · amzn 2023	2.90-1.amzn2023.0.3	ALAS2023-2026-1729	May 25, 2026
dnsmasq-debugsource · amzn 2023	2.90-1.amzn2023.0.3	ALAS2023-2026-1729	May 25, 2026
dnsmasq-utils · amzn 2023	2.90-1.amzn2023.0.3	ALAS2023-2026-1729	May 25, 2026
dnsmasq-utils-debuginfo · amzn 2023	2.90-1.amzn2023.0.3	ALAS2023-2026-1729	May 25, 2026

Details

Published
May 25, 2026
Weakness
Loop with Unreachable Exit Condition ('Infinite Loop')
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-13002

For tools and AI agents

This page as data: JSON · Markdown

Link to this page

If this page saved you time, a link to it in your ticket, advisory or write-up helps others find it.

HTML

<a href="https://patchblox.com/security/cve/CVE-2026-13002">CVE-2026-13002 on Patchblox Patch Radar</a>

Reusing the data? How to credit Patch Radar.

Is this on your machines?

Patchblox finds every install below the fixed version on Windows, macOS and Linux, and updates them through your release rings.

Get a demo

Patch Radar data is free to use with attribution. Terms and how to credit it.

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.