CVE-2026-52684
Prefetch Feature Allows Persistent Ghost Domain Cache Poisoning Attack
Description
If the auth responds very slowly and the records expire in between, the capping of TTLs is not enforced for lack of data. This does not happen on regular resolve as then then the child records are used immediately if not expired and thus valid, or the records are expired, and in that case not used. So this case can only happen if almost expired records are used to refresh the authoritative NS records.
INFO
Published Date :
July 23, 2026, 9:16 a.m.
Last Modified :
July 23, 2026, 9:16 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | LOW | 8ce71d90-2354-404b-a86e-bec2cc4e6981 | ||||
| CVSS 3.1 | LOW | [email protected] |
Solution
- Optimize authentication response times.
- Implement strict TTL enforcement for records.
- Review record refresh mechanisms.
- Test expiry handling under load.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-52684.
| URL | Resource |
|---|---|
| https://github.com/PowerDNS/pdns/pull/17748 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-52684 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-52684
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-52684 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-52684 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by [email protected]
Jul. 23, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://github.com/PowerDNS/pdns', 'vendor': 'PowerDNS', 'modules': ['Packet cache', 'Record cache'], 'product': 'Recursor', 'versions': [{'status': 'affected', 'version': '0.0.0', 'lessThan': '5.5.0', 'versionType': 'semver'}], 'packageName': 'pdns-recursor', 'programFiles': ['rec-packetcache.cc', 'recursor_cache.cc'], 'collectionURL': 'https://repo.powerdns.com/', 'defaultStatus': 'unaffected'}] Added Description If the auth responds very slowly and the records expire in between, the capping of TTLs is not enforced for lack of data. This does not happen on regular resolve as then then the child records are used immediately if not expired and thus valid, or the records are expired, and in that case not used. So this case can only happen if almost expired records are used to refresh the authoritative NS records. Added CVSS V3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N Added Reference https://github.com/PowerDNS/pdns/pull/17748