CVE-2026-33489 Vulnerability Analysis & Exploit Details

CVE-2026-33489
Vulnerability Scoring

7.5
/10
Very High Risk

Highly exploitable, CVE-2026-33489 poses a critical security risk that could lead to severe breaches.

Attack Complexity Details

  • Attack Complexity: Low
    Exploits can be performed without significant complexity or special conditions.
  • Attack Vector: Network
    Vulnerability is exploitable over a network without physical access.
  • Privileges Required: None
    No privileges are required for exploitation.
  • Scope: Unchanged
    Exploit remains within the originally vulnerable component.
  • User Interaction: None
    No user interaction is necessary for exploitation.

CVE-2026-33489 Details

Status: Analyzed

Last updated: 🕓 08 May 2026, 16:00 UTC
Originally published on: 🕗 05 May 2026, 20:16 UTC

Time between publication and last update: 2 days

CVSS Release: version 3

CVSS3 Source

nvd@nist.gov

CVSS3 Type

Primary

CVSS3 Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVE-2026-33489 Vulnerability Summary

CVE-2026-33489: 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.

Assessing the Risk of CVE-2026-33489

Access Complexity Graph

The exploitability of CVE-2026-33489 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).

Exploitability Analysis for CVE-2026-33489

With low attack complexity and no required privileges, CVE-2026-33489 is an easy target for cybercriminals. Organizations should prioritize immediate mitigation measures to prevent unauthorized access and data breaches.

Understanding AC and PR

A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.

Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.

Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.

CVSS Score Breakdown Chart

Above is the CVSS Sub-score Breakdown for CVE-2026-33489, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.

CIA Impact Analysis

Below is the Impact Analysis for CVE-2026-33489, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

  • Confidentiality: High
    Exploiting CVE-2026-33489 can result in unauthorized access to sensitive data, severely compromising data privacy.
  • Integrity: None
    CVE-2026-33489 poses no threat to data integrity.
  • Availability: None
    CVE-2026-33489 does not impact system availability.

CVE-2026-33489 References

External References

CWE Common Weakness Enumeration

CWE-863

Vulnerable Configurations

  • cpe:2.3:a:coredns.io:coredns:-:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:-:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:0.9.9:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:0.9.9:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:0.9.10:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:0.9.10:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:001:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:001:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.0.0:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.0.0:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.0.1:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.0.1:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.0.2:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.0.2:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.0.3:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.0.3:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.0.4:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.0.4:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.0.5:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.0.5:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.0.6:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.0.6:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.1.0:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.1.0:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.1.1:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.1.1:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.1.2:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.1.2:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.1.3:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.1.3:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.1.4:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.1.4:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.2.0:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.2.0:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.2.1:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.2.1:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.2.2:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.2.2:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.2.3:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.2.3:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.2.4:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.2.4:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.2.5:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.2.5:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.2.6:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.2.6:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.3.0:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.3.0:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.3.1:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.3.1:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.4.0:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.4.0:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.5.0:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.5.0:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.5.1:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.5.1:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.5.2:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.5.2:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.6.0:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.6.0:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.6.1:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.6.1:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.6.2:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.6.2:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.6.3:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.6.3:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.6.4:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.6.4:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.6.5:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.6.5:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.6.6:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.6.6:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.6.7:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.6.7:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.6.8:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.6.8:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.6.9:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.6.9:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.7.0:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.7.0:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.7.1:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.7.1:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.8.0:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.8.0:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.8.1:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.8.1:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.8.2:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.8.2:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.8.3:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.8.3:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.8.4:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.8.4:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.8.5:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.8.5:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.8.6:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.8.6:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.8.7:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.8.7:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.9.0:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.9.0:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.9.1:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.9.1:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.9.2:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.9.2:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.9.3:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.9.3:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.9.4:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.9.4:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.10.0:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.10.0:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.10.1:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.10.1:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.11.0:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.11.0:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.11.1:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.11.1:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.11.3:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.11.3:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.11.4:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.11.4:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.12.0:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.12.0:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.12.1:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.12.1:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.12.2:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.12.2:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.12.3:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.12.3:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.12.4:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.12.4:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.13.0:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.13.0:*:*:*:*:*:*:*
  • cpe:2.3:a:coredns.io:coredns:1.13.1:*:*:*:*:*:*:*
    cpe:2.3:a:coredns.io:coredns:1.13.1:*:*:*:*:*:*:*

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