VDB-362746 · CVE-2026-4890 · Nessus 314983

dnsmasq 2.92rel2 DNSSEC Validation infinite loop

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.6	$0-$5k	0.00

Summaryinfo

A vulnerability was found in dnsmasq 2.92rel2. It has been declared as problematic. Affected is an unknown function of the component DNSSEC Validation. Executing a manipulation can lead to infinite loop. This vulnerability is handled as CVE-2026-4890. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability classified as problematic was found in dnsmasq 2.92rel2. This vulnerability affects some unknown processing of the component DNSSEC Validation. The manipulation with an unknown input leads to a infinite loop vulnerability. The CWE definition for the vulnerability is CWE-835. The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop. As an impact it is known to affect availability. CVE summarizes:

A Denial of Service (DoS) vulnerability in the DNSSEC validation of dnsmasq allows remote attackers to cause a denial of service via a crafted DNS packet.

The advisory is available at kb.cert.org. This vulnerability was named CVE-2026-4890 since 03/26/2026. The exploitation appears to be difficult. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1499 by the MITRE ATT&CK project.

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). If you want to get best quality of vulnerability data, you may have to visit VulDB.

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

Domain Name Software

Name

dnsmasq

Version

2.92rel2

License

open-source

CPE 2.3info

🔒

CPE 2.2info

🔒

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.6
VulDB Meta Temp Score: 5.6

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

ADP CISA Base Score: 7.5
ADP CISA Vector: 🔒

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Infinite loop
CWE: CWE-835 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

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: kb.cert.org
Status: Not defined

CVE: CVE-2026-4890 (🔒)
GCVE (CVE): GCVE-0-2026-4890
GCVE (VulDB): GCVE-100-362746
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), 05/13/2026 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

If you want to get best quality of vulnerability data, you may have to visit VulDB.