CVE-2026-5172
Summary
| CVE | CVE-2026-5172 |
|---|---|
| State | PUBLISHED |
| Assigner | certcc |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-05-11 18:16:41 UTC |
| Updated | 2026-06-30 03:21:05 UTC |
| Description | A buffer overflow in dnsmasq’s extract_addresses() function allows an attacker to trigger a heap out-of-bounds read and crash by exploiting a malformed DNS response, enabling extract_name() to advance the pointer past the record’s end. |
Risk And Classification
Primary CVSS: v3.1 7.3 HIGH from ADP
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
EPSS: 0.009330000 probability, percentile 0.563670000 (date 2026-07-03)
Problem Types: CWE-125 | CWE-787: Out-of-bounds Write | CWE-125 Out-of-bounds Read
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | ADP | DECLARED | 7.3 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L |
| 3.1 | ADP | CVSS | 7.5 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| 3.1 | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | Secondary | 7.3 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L |
| 3.1 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | Secondary | 7.5 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
NoneUser Interaction
NoneScope
UnchangedConfidentiality
LowIntegrity
LowAvailability
LowCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Dnsmasq | Dnsmasq | affected 2.92rel2 custom | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux AppStream V. 10 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 6 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 8 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 9 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 7 | Not specified | Not specified |
| ADP | Red Hat | Red Hat OpenShift Container Platform 4 | Not specified | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| bugzilla.redhat.com/show_bug.cgi | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | bugzilla.redhat.com | |
| access.redhat.com/security/cve/CVE-2026-5172 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-5172.json | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | security.access.redhat.com | |
| github.com/NixOS/nixpkgs/pull/519093 | [email protected] | github.com | |
| www.kb.cert.org/vuls/id/471747 | [email protected] | www.kb.cert.org | |
| thekelleys.org.uk/dnsmasq/CVE | [email protected] | thekelleys.org.uk | |
| access.redhat.com/errata/RHSA-2026:19158 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| github.com/NixOS/nixpkgs/pull/519082 | [email protected] | github.com | |
| lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.html | [email protected] | lists.thekelleys.org.uk | |
| github.com/pi-hole/FTL/releases/tag/v6.6.2 | [email protected] | github.com | |
| thekelleys.org.uk/dnsmasq | MITRE | thekelleys.org.uk | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| ADP | 2026-04-14T22:55:28.042Z | Reported to Red Hat. |
| ADP | 2026-05-09T00:00:00.000Z | Made public. |
Solutions
ADP: RHSA-2026:19158: Red Hat Enterprise Linux AppStream (v. 10)
There are currently no legacy QID mappings associated with this CVE.