Answer in brief
CVE-2026-42387 records a Medium severity (CVSS 5.9) vulnerability in Insufficient input validation in ZoneToCache. The current sources do not mark it as known exploited. The current feed maps PowerDNS/Recursor (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 5.9. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps PowerDNS/Recursor (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| PowerDNS/Recursorgeneric | >=5.2.0 <5.2.11 || >=5.3.0 <5.3.8 || >=5.4.0 <5.4.3 | 5.2.11, 5.3.8, 5.4.3 |
Published upstream
Jun 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jun 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 25, 2026
A malicious authoritative server can send a crafted zone via the ZoneToCache function that leads to a crash of the Recursor due to insuffcient input validation.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-42387 records a Medium severity (CVSS 5.9) vulnerability in Insufficient input validation in ZoneToCache. The current sources do not mark it as known exploited. The current feed maps PowerDNS/Recursor (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 5.9. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps PowerDNS/Recursor (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| PowerDNS/Recursorgeneric | >=5.2.0 <5.2.11 || >=5.3.0 <5.3.8 || >=5.4.0 <5.4.3 | 5.2.11, 5.3.8, 5.4.3 |
Published upstream
Jun 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jun 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 25, 2026
A malicious authoritative server can send a crafted zone via the ZoneToCache function that leads to a crash of the Recursor due to insuffcient input validation.
Quoted source text, attributed separately from HOL analysis.