CVE-2026-4891 Details
Description
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.
A heap-based out-of-bounds read vulnerability has been identified in dnsmasq's DNSSEC validation. This vulnerability allows remote attackers to leak memory information by sending a crafted DNS packet, potentially leading to a denial-of-service condition by causing the dnsmasq process to crash or become unresponsive.
dnsmasq has released a patch in version 2.92rel2 to address this vulnerability. Users should upgrade to this version.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed May 11, 2026References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-125 | Out-of-bounds Read | redhat-SADP |
Affected Products
No affected product data is available for this CVE.
Change History
12 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Aug 25, 2026 | CVE Modified | redhat-SADP |
| Aug 24, 2026 | CVE Modified | redhat-SADP |
| Jul 23, 2026 | CVE Modified | redhat-SADP |
| Jul 15, 2026 | CVE Modified | redhat-SADP |
| Jul 2, 2026 | CVE Modified | redhat-SADP |
| Jun 30, 2026 | CVE Modified | redhat-SADP |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Jun 17, 2026 | CVE Modified | [email protected] |
| May 11, 2026 | CVE Modified | [email protected] |
| May 11, 2026 | CVE Modified | CISA-ADP |
| May 11, 2026 | CVE Modified | [email protected] |
| May 11, 2026 | New CVE Received | [email protected] |