dnsmasq 2.92rel2 DNSSEC Validation out-of-bounds

CVSS Meta Temp Score
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CTI Interest Score
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4.5$0-$5k0.00

Summaryinfo

A vulnerability was found in dnsmasq 2.92rel2. It has been rated as problematic. Affected by this vulnerability is an unknown functionality of the component DNSSEC Validation. The manipulation leads to out-of-bounds. This vulnerability is uniquely identified as CVE-2026-4891. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in dnsmasq 2.92rel2. This issue affects an unknown function of the component DNSSEC Validation. The manipulation with an unknown input leads to a out-of-bounds vulnerability. Using CWE to declare the problem leads to CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. Impacted is availability. The summary by CVE is:

A heap-based out-of-bounds read vulnerability in the DNSSEC validation of dnsmasq allows remote attackers to cause a denial of service via a crafted DNS packet.

It is possible to read the advisory at lists.thekelleys.org.uk. The identification of this vulnerability is CVE-2026-4891 since 03/26/2026. The exploitation is known to be difficult. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available.

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), EUVD (EUVD-2026-29153) and CERT Bund (WID-SEC-2026-1468). Statistical analysis made it clear that VulDB provides the best quality 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: 4.5
VulDB Meta Temp Score: 4.5

VulDB Base Score: 3.7
VulDB Temp Score: 3.7
VulDB Vector: 🔒
VulDB Reliability: 🔍

ADP CISA Base Score: 5.3
ADP CISA Vector: 🔒

CVSSv2info

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

Exploitinginfo

Class: Out-of-bounds
CWE: CWE-125 / CWE-119
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

03/26/2026 CVE reserved
05/11/2026 +45 days Advisory disclosed
05/11/2026 +0 days VulDB entry created
07/03/2026 +53 days VulDB entry last update

Sourcesinfo

Advisory: lists.thekelleys.org.uk
Status: Not defined

CVE: CVE-2026-4891 (🔒)
GCVE (CVE): GCVE-0-2026-4891
GCVE (VulDB): GCVE-100-362747
EUVD: 🔒
CERT Bund: WID-SEC-2026-1468 - dnsmasq: Mehrere Schwachstellen

Entryinfo

Created: 05/11/2026 20:42
Updated: 07/03/2026 20:22
Changes: 05/11/2026 20:42 (53), 05/11/2026 22:34 (1), 05/13/2026 07:57 (7), 05/16/2026 10:02 (2), 07/02/2026 15:40 (11), 07/03/2026 20:22 (1)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Discussion

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