DSA-6397-1 pdns-recursor - security update
Multiple vulnerabilities have been discovered in PDNS Recursor, a resolving name server, which could result in cache poisoning or DNSSEC validation bypass. https://security-tracker.debian.org/tracker/DSA-6397-1
CSIRTS triage
- What
- Multiple vulnerabilities in PDNS Recursor could result in cache poisoning or DNSSEC validation bypass.
- Who is affected
- Deployments of PDNS Recursor.
- Urgency
- Remediation urgency is unknown due to unspecified severity.
- Action
- Apply the latest security updates for PDNS Recursor.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://lists.debian.org/debian-security-announce/2026/msg00308.html
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-526860.11% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 2% of all scored CVEs.
- Low exploitation riskCVE-2026-526880.13% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 3% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-52686 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-52688 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- medium[NEW] [medium] PowerDNS: Multiple Vulnerabilities Allow Bypassing of Security Measurescert-bund
- highCVE-2026-52688: RRSIGs with too few labels can lead to bypass of DNSSEC wildcard validationnvd
- lowCVE-2026-52686: The issue is a DNSSEC validation bypass where wildcard expansion proofs (NSEC/NSEC3 records) a…nvd
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