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CVE-2026-44687: Off-by-one error in 'harden-below-nxdomain' logic can shadow a stub/forward zone by a legitimate parent's NXDOMAIN

lowCVSS 3.7CVE-2026-44687

CSIRTS triage

vendor: CoreDNSproduct: CoreDNSOther
What
An off-by-one error can shadow a stub/forward zone by a legitimate parent's NXDOMAIN.
Who is affected
Deployments of CoreDNS using the affected configuration.
Urgency
Remediation is low urgency as the severity is low and exploitation is not reported.
Action
No specific action is required at this time.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
low — CVSS 3.7
Published
2026-07-14
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-44687

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.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-44687coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for Off-by-one error in

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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