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CVE-2026-4893

Quick assessment

Affected
dnsmasq dnsmasq
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

DNSmasq是Simon Kelley个人开发者的一个DNS配置工具。 DNSmasq存在安全漏洞，该漏洞源于信息泄露，允许远程攻击者通过带有RFC 7871客户端子网信息的特制DNS数据包绕过源检查。

AI Predicted 5.3 Difficulty: Easy EPSS 0.58% · P46

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 1

VendorProduct Version RangeStatus
dnsmasq dnsmasq < 2.92rel2 affected
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I. Basic Information for CVE-2026-4893

Vulnerability Information
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Vulnerability Title
CVE-2026-4893
Source: CVE Program / CVE List V5
Vulnerability Description
An information disclosure vulnerability in dnsmasq allows remote attackers to bypass source checks via a crafted DNS packet with RFC 7871 client subnet information.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
DNSmasq 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
DNSmasq是Simon Kelley个人开发者的一个DNS配置工具。 DNSmasq存在安全漏洞，该漏洞源于信息泄露，允许远程攻击者通过带有RFC 7871客户端子网信息的特制DNS数据包绕过源检查。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
dnsmasq dnsmasq 0 ~ 2.92rel2 -

II. Public POCs for CVE-2026-4893

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III. Intelligence Information for CVE-2026-4893

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Patches & Fixes for CVE-2026-4893 (3)

Vendor Advisories for CVE-2026-4893 (1)

Mailing List Discussions for CVE-2026-4893 (1)

Vendor Pages for CVE-2026-4893 (1)

Same Patch Batch · dnsmasq · 2026-05-11 · 6 CVEs total

CVE-2026-2291 CVE-2026-2291
CVE-2026-4892 CVE-2026-4892
CVE-2026-4891 CVE-2026-4891
CVE-2026-4890 CVE-2026-4890
CVE-2026-5172 CVE-2026-5172

IV. Related Vulnerabilities

Same product: dnsmasq
Same vendor: dnsmasq

V. Comments for CVE-2026-4893

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