dnsmasq 2.92rel2 extract_name integer overflow

CVSS Meta Temp Score
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CTI Interest Score
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6.4$0-$5k0.00

Summaryinfo

A vulnerability was found in dnsmasq 2.92rel2. It has been classified as critical. Affected by this vulnerability is the function extract_name. Performing a manipulation results in integer overflow. This vulnerability was named CVE-2026-2291. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability, which was classified as critical, was found in dnsmasq 2.92rel2. This affects the function extract_name. The manipulation with an unknown input leads to a integer overflow vulnerability. CWE is classifying the issue as CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

dnsmasqs 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.

It is possible to read the advisory at suse.com. This vulnerability is uniquely identified as CVE-2026-2291 since 02/10/2026. The exploitability is told to be difficult. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 07/21/2026).

The vulnerability scanner Nessus provides a plugin with the ID 314983 (Fedora 44 : dnsmasq (2026-ac5cceec13)), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Tenable (314983) and CERT Bund (WID-SEC-2026-1468). Be aware that VulDB is the high quality source for vulnerability data.

Affected

  • Debian Linux
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Fedora Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • SUSE openSUSE
  • RESF Rocky Linux
  • Open Source dnsmasq

Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.4

VulDB Base Score: 5.6
VulDB Temp Score: 5.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

ADP CISA Base Score: 7.3
ADP CISA Vector: 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Integer overflow
CWE: CWE-190 / CWE-189
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 314983
Nessus Name: Fedora 44 : dnsmasq (2026-ac5cceec13)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

02/10/2026 CVE reserved
05/11/2026 +89 days Advisory disclosed
05/11/2026 +0 days VulDB entry created
07/21/2026 +71 days VulDB entry last update

Sourcesinfo

Advisory: suse.com
Status: Not defined

CVE: CVE-2026-2291 (🔒)
GCVE (CVE): GCVE-0-2026-2291
GCVE (VulDB): GCVE-100-362703
CERT Bund: WID-SEC-2026-1468 - dnsmasq: Mehrere Schwachstellen

Entryinfo

Created: 05/11/2026 20:28
Updated: 07/21/2026 08:14
Changes: 05/11/2026 20:28 (53), 05/13/2026 07:57 (7), 05/16/2026 10:02 (2), 07/03/2026 20:11 (1), 07/21/2026 08:14 (11)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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