CVE-2026-2291

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Summary

CVECVE-2026-2291
StatePUBLISHED
Assignercertcc
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-11 18:16:31 UTC
Updated2026-07-20 21:16:46 UTC
Descriptiondnsmasqs extract_name() function can be abused to cause a heap buffer overflow, allowing an attacker to inject false DNS cache entries, which could result in DNS lookups to redirect to an attacker-controlled IP address, or to cause a DoS.

Risk And Classification

Primary CVSS: v3.1 7.3 HIGH from ADP

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

EPSS: 0.007540000 probability, percentile 0.510040000 (date 2026-07-20)

Problem Types: CWE-190: Integer Overflow or Wraparound

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED7.3HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary7.3HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
Low

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Dnsmasq Dnsmasq affected 2.92rel2 custom Not specified

References

ReferenceSourceLinkTags
www.openwall.com/lists/oss-security/2026/07/20/14 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
github.com/NixOS/nixpkgs/pull/519093 [email protected] github.com
www.suse.com/security/cve/CVE-2026-2291.html [email protected] www.suse.com
www.kb.cert.org/vuls/id/471747 [email protected] www.kb.cert.org
thekelleys.org.uk/dnsmasq/CVE [email protected] thekelleys.org.uk
github.com/NixOS/nixpkgs/pull/519082 [email protected] github.com
lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.html [email protected] lists.thekelleys.org.uk
github.com/pi-hole/FTL/releases/tag/v6.6.2 [email protected] github.com
thekelleys.org.uk/dnsmasq/doc.html MITRE thekelleys.org.uk
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