dnsmasq 2.92rel2 DHCPv6 heap-based overflow

CVSS Meta Temp Score
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CTI Interest Score
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8.1$0-$5k0.77

Summaryinfo

A vulnerability categorized as critical has been discovered in dnsmasq 2.92rel2. Affected by this issue is some unknown functionality of the component DHCPv6 Handler. The manipulation results in heap-based overflow. This vulnerability was named CVE-2026-4892. The attack needs to be approached locally. There is no available exploit.

Detailsinfo

A vulnerability, which was classified as critical, was found in dnsmasq 2.92rel2. Affected is an unknown functionality of the component DHCPv6 Handler. The manipulation with an unknown input leads to a heap-based overflow vulnerability. CWE is classifying the issue as CWE-122. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

A heap-based out-of-bounds write vulnerability in the DHCPv6 implementation of dnsmasq allows local attackers to execute arbitrary code with root privileges via a crafted DHCPv6 packet.

The advisory is shared for download at lists.thekelleys.org.uk. This vulnerability is traded as CVE-2026-4892 since 03/26/2026. The exploitability is told to be easy. The attack needs to be approached locally. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 07/03/2026).

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), EUVD (EUVD-2026-29154) and CERT Bund (WID-SEC-2026-1468). Once again VulDB remains the best 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: 8.1
VulDB Meta Temp Score: 8.1

VulDB Base Score: 7.8
VulDB Temp Score: 7.8
VulDB Vector: 🔒
VulDB Reliability: 🔍

ADP CISA Base Score: 8.4
ADP CISA Vector: 🔒

CVSSv2info

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

Exploitinginfo

Class: Heap-based overflow
CWE: CWE-122 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

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-2026-4892 (🔒)
GCVE (CVE): GCVE-0-2026-4892
GCVE (VulDB): GCVE-100-362748
EUVD: 🔒
CERT Bund: WID-SEC-2026-1468 - dnsmasq: Mehrere Schwachstellen

Entryinfo

Created: 05/11/2026 20:42
Updated: 07/03/2026 20:11
Changes: 05/11/2026 20:42 (53), 05/12/2026 00:06 (1), 05/13/2026 07:57 (7), 05/16/2026 10:02 (2), 07/02/2026 15:40 (11), 07/03/2026 20:11 (1)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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