CVE-2026-4891
CVE-2026-4891
MEDIUM
5.3
CVSS Score
Published: May 11, 2026 at 04:47 PM UTC
Updated: September 1, 2026 at 12:28 PM UTC
2 products affected across 2 vendorsEnterprise LinuxDnsmasq
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Severity
MEDIUM5.3
Exploit prediction
EPSS 6%
SSVC
No known exploit
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.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
v < 2.92rel2
Affected range stops below 2.92rel2, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 0:2.79-36.el8_10 (unaffected)
Vendor states this is fixed in 0:2.85-17.el9_6.1 (unaffected)
Vendor states this is fixed in 0:2.85-18.el9_8.1 (unaffected)
Vendor states this is fixed in 0:2.90-7.el10_2 (unaffected)
Remediation
No guide yetNo remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.
References (15)
Source: cverecord
https://thekelleys.org.uk/dnsmasq/Source: cverecord
https://www.kb.cert.org/vuls/id/471747Source: cverecord
https://thekelleys.org.uk/dnsmasq/CVE/Source: cverecord
https://github.com/NixOS/nixpkgs/pull/519082Source: cverecord
https://github.com/NixOS/nixpkgs/pull/519093Source: cverecord
https://github.com/pi-hole/FTL/releases/tag/v6.6.2Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/errata/RHSA-2026:19158SSVC — Action Prioritization
SSVCNo known exploitNot automatablePartial impact
SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.
CVSS
5.3MEDIUMCISA-ADP
- Attack Vector
- NETWORK
- Complexity
- LOW
- Privileges
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- LOW
- Integrity
- NONE
- Availability
- NONE
Vector?
Quick Info
StatusAWAITING ANALYSIS
CWE
CWE-125
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