DSA-6367-1 dnsdist - security update
Multiple security vulnerabilities were discovered in the dnsdist DNS loadbalancer, which could result in denial of service, information disclosure or bypass of security rules. https://security-tracker.debian.org/tracker/DSA-6367-1
CSIRTS triage
- What
- Multiple vulnerabilities in dnsdist could lead to denial of service, information disclosure, or bypass of security rules.
- Who is affected
- Deployments of dnsdist are affected.
- Urgency
- Remediation is important due to the potential for service disruption and security breaches.
- Action
- Apply the latest security update for dnsdist.
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/msg00278.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-2026-400110.16% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 5% of all scored CVEs.
- Low exploitation riskCVE-2026-402080.29% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 20% of all scored CVEs.
- Low exploitation riskCVE-2026-402090.40% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 33% of all scored CVEs.
- Low exploitation riskCVE-2026-402100.34% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 26% of all scored CVEs.
- Low exploitation riskCVE-2026-402110.41% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 33% of all scored CVEs.
- Low exploitation riskCVE-2026-420040.16% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 6% of all scored CVEs.
- Low exploitation riskCVE-2026-420050.48% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 38% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-40011 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-40208 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-40209 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-40210 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-40211 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-42004 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-42005 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- unknownDSA-6368-1 pdns - security updatedebian
- unknownDSA-6369-1 pdns-recursor - security updatedebian
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