CVE-2026-5172
Received Received - Intake
Heap Out-of-Bounds Read in Dnsmasq DNS Response Handling

Publication date: 2026-05-11

Last updated on: 2026-05-11

Assigner: CERT/CC

Description
A buffer overflow in dnsmasq’s extract_addresses() function allows an attacker to trigger a heap out-of-bounds read and crash by exploiting a malformed DNS response, enabling extract_name() to advance the pointer past the record’s end.
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Meta Information
Published
2026-05-11
Last Modified
2026-05-11
Generated
2026-05-11
AI Q&A
2026-05-11
EPSS Evaluated
N/A
NVD
CVE-2026-5172
EUVD
EUVD-2026-29156
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
the_dnsmasq_project dnsmasq *
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-UNKNOWN
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AI Powered Q&A
Can you explain this vulnerability to me?

This vulnerability is a buffer overflow in the extract_addresses() function of dnsmasq. It allows an attacker to cause a heap out-of-bounds read and crash the program by sending a malformed DNS response. The issue arises because the extract_name() function advances the pointer beyond the end of the DNS record.


How can this vulnerability impact me? :

The vulnerability can lead to a crash of the dnsmasq service due to a heap out-of-bounds read triggered by a malformed DNS response. This can cause denial of service, potentially disrupting network services that rely on dnsmasq for DNS resolution.


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