NVD - CVE-2026-33489 (original) (raw)
Description
CoreDNS is a DNS server that chains plugins. In versions prior to 1.14.3, the transfer plugin can select the wrong ACL stanza when both a parent zone and a more-specific subzone are configured. The longestMatch() function in plugin/transfer/transfer.go uses a lexicographic string comparison instead of an actual longest-suffix match to select the winning zone. As a result, a permissive parent-zone transfer rule can override a restrictive subzone rule depending on zone name ordering (e.g., "example.org." > "a.example.org." lexicographically). This allows an unauthorized remote client to perform AXFR/IXFR for the subzone and retrieve its full zone contents. This issue has been fixed in version 1.14.3.
Metrics
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CVSS 4.0 Severity and Vector Strings:
NIST: NVD
NVD assessment not yet provided.
CNA: GitHub, Inc.
Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
CVSS 3.x Severity and Vector Strings:
NIST: NVD
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS 2.0 Severity and Vector Strings:
NIST: NVD
Base Score: N/A
NVD assessment not yet provided.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/coredns/coredns/releases/tag/v1.14.3 | GitHub, Inc. | Release Notes |
| https://github.com/coredns/coredns/security/advisories/GHSA-h8mm-c463-wjq3 | CISA-ADP, GitHub, Inc. | Exploit Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-863 | Incorrect Authorization | GitHub, Inc. |
Known Affected Software Configurations Switch to CPE 2.2
Change History
3 change records found show changes
Initial Analysis by NIST 5/08/2026 12:00:05 PM
| Action | Type | Old Value | New Value |
|---|---|---|---|
| Added | CVSS V3.1 | AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N | |
| Added | CPE Configuration | OR *cpe:2.3:a:coredns.io:coredns:*:*:*:*:*:*:*:* versions up to (excluding) 1.14.3 | |
| Added | Reference Type | CISA-ADP: https://github.com/coredns/coredns/security/advisories/GHSA-h8mm-c463-wjq3 Types: Exploit, Vendor Advisory | |
| Added | Reference Type | GitHub, Inc.: https://github.com/coredns/coredns/releases/tag/v1.14.3 Types: Release Notes | |
| Added | Reference Type | GitHub, Inc.: https://github.com/coredns/coredns/security/advisories/GHSA-h8mm-c463-wjq3 Types: Exploit, Vendor Advisory |
CVE Modified by CISA-ADP 5/05/2026 4:16:36 PM
| Action | Type | Old Value | New Value |
|---|---|---|---|
| Added | Reference | https://github.com/coredns/coredns/security/advisories/GHSA-h8mm-c463-wjq3 |
New CVE Received from GitHub, Inc. 5/05/2026 4:16:36 PM
| Action | Type | Old Value | New Value |
|---|---|---|---|
| Added | Description | CoreDNS is a DNS server that chains plugins. In versions prior to 1.14.3, the transfer plugin can select the wrong ACL stanza when both a parent zone and a more-specific subzone are configured. The longestMatch() function in plugin/transfer/transfer.go uses a lexicographic string comparison instead of an actual longest-suffix match to select the winning zone. As a result, a permissive parent-zone transfer rule can override a restrictive subzone rule depending on zone name ordering (e.g., "example.org." > "a.example.org." lexicographically). This allows an unauthorized remote client to perform AXFR/IXFR for the subzone and retrieve its full zone contents. This issue has been fixed in version 1.14.3. | |
| Added | CVSS V4.0 | AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X | |
| Added | CWE | CWE-863 | |
| Added | Reference | https://github.com/coredns/coredns/releases/tag/v1.14.3 | |
| Added | Reference | https://github.com/coredns/coredns/security/advisories/GHSA-h8mm-c463-wjq3 |