CVE-2026-40012
MEDIUMDescription
ECS zero scoped answers are stored in the packet cache while they should not. This impacts only configurations that have ECS enabled;
How to fix
TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works
Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.
CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Exploit Intelligence
Low risk: more likely to be exploited than 24% of all known CVEs.
References
Related Vulnerabilities
Other CWE-524 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2019-9494 | Medium | 5.9 | 3.9% | - | Fix |
| CVE-2021-24027 | High | 7.5 | 3.8% | - | Fix |
| CVE-2019-9495 | Low | 3.7 | 3.4% | - | Fix |
| CVE-2019-14997 | Medium | 4.3 | 1.2% | - | Fix |
| CVE-2024-0874 | Medium | 5.3 | 0.8% | - | Fix |
| CVE-2024-45596 | High | 7.4 | 0.6% | - | Fix |
Common questions
How do I fix CVE-2026-40012?
Upgrade pdns-recursor on debian 13 to 5.2.11-0+deb13u1 or later.
Is CVE-2026-40012 being actively exploited?
Not that we know of. CVE-2026-40012 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.32% is the estimated probability that it will be exploited in the next 30 days. That is higher than 24% of all scored CVEs.
How severe is CVE-2026-40012?
CVE-2026-40012 has a CVSS v3 base score of 5.3, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
What does CVE-2026-40012 affect?
Published advisories record a fix for pdns-recursor (Debian). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.
Embed a live status badge for CVE-2026-40012
Markdown
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TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.
This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-25.