Vulnerability · CVE-2026-33601
If you use the zoneToCache function with a malicious authoritative server, an attacker can send a zone that result in a null pointer dereference, caused by a missing c…
Published Apr 22, 2026 · catalog updated Jun 17, 2026 · the affected product
Last checked Oct 31, 2026. A connected source was read within the last 7 days.
Check if you run it
No confirmed exploitation is on record for CVE-2026-33601. EPSS is 0.51%. Act only if a listed version of the affected product is installed.
Gaps on this record
- No plain product name is stored. The page cannot tell you which product to check.
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
Same product and reporting
- CVE-2026-33600 · Medium
- CVE-2026-33262 · Medium
- CVE-2026-33261 · Medium
- CVE-2026-33259 · Medium
- CVE-2026-33258 · High
- Severity
- Medium4.9
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 0.51%
- Remediation
- Advisory link
- Affected products
- cpe powerdns/recursor
If you use the zoneToCache function with a malicious authoritative server, an attacker can send a zone that result in a null pointer dereference, caused by a missing consistency check and leading to a denial of service.
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- cpe powerdns/recursor5.4.0
How to fix CVE-2026-33601
No stored fix
No vendor fix text is stored. Use the linked advisory before you change production.
Version check
Seen in 5.4.0
Advisory
Open the cve_org record and follow its fix.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2026-33601. EPSS is 0.51%. Act only if a listed version of the affected product is installed.
Which versions are affected?
Compare what you have installed with 5.4.0. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
CWE-476: NULL Pointer Dereference. EPSS 0.51%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Apr 22, 2026 · NIST NVD
Detected
If you use the zoneToCache function with a malicious authoritative server, an attacker can send a zone that result in a null pointer dereference, caused by a missing consistency check and leading to a denial of service.
Jun 17, 2026 · NIST NVD
Updated
If you use the zoneToCache function with a malicious authoritative server, an attacker can send a zone that result in a null pointer dereference, caused by a missing consistency check and leading to a denial of service.
Sources
- CVE.orgVulnerability recordCVE-2026-33601
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2026-33601
30-day exploitation probability 0.51%
first.org - NIST NVDVulnerability recordCVE-2026-33601
If you use the zoneToCache function with a malicious authoritative server, an attacker can send a zone that result in a null pointer dereference, caused by a missing consistency check and leading to a denial of service.
nvd.nist.gov
References
Freshness
Last verified in this catalog Oct 31, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.
- FIRST EPSSOct 31, 2026
- CVE.orgOct 16, 2026
- NIST NVDOct 15, 2026