Review reviewHigh
CVE-2026-52688
PowerDNS Recursor
RRSIGs with too few labels can lead to bypass of DNSSEC wildcard validation
- CVSS
- 7.5
- EPSS
- 0.13% 2.73% percentile
- CISA KEV
- Not listed
- Published
- 2026.07.23
Review review
The CVSS severity warrants an early asset and exposure review.
Known exploitationNot established by KEV
Exploit probability0.13%
Technical severityCVSS 7.5
Vulnerability overview
RRSIGs with too few labels can lead to bypass of DNSSEC wildcard validation
Affected product and versions
- Product
- PowerDNS Recursor
- Affected versions
- >= 5.2.0 < 5.2.12, >= 5.3.0 < 5.3.9, >= 5.4.0 < 5.4.4
- Fixed versions
- No verified fixed-version field is available yet
Recommended response sequence
Confirm exposure before applying a vendor-supported change.
- 1Identify
Confirm that PowerDNS Recursor and an affected version are present.
- 2Prioritize
Combine exploitation signals with asset exposure and business criticality.
- 3Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
- 4Verify
Recheck the version, service health, access paths, and relevant logs.
Technical data
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- CWE
- CWE-295, CWE-345