CVE-2026-62299: CoreDNS: rewrite-plugin EDNS0 response-revert nil-pointer panic (remote DoS) when a downstream plugin returns a response with no OPT record

mediumCVSS 5.3CVE-2026-62299

CSIRTS triage

vendor: CoreDNS product: CoreDNS Denial of service

What: The rewrite-plugin can cause a nil-pointer panic when a downstream plugin returns a response without an OPT record, resulting in a denial of service.
Who is affected: Deployments of CoreDNS using the rewrite-plugin.
Urgency: Remediation is important as this vulnerability has medium severity and can lead to service disruption.
Action: Update to the latest version of CoreDNS that resolves this issue.

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: medium — CVSS 5.3
Published: 2026-07-14
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62299

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-2026-622990.31% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 24% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-62299	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

mediumCVE-2026-62299: CoreDNS is a DNS server written in Go. Prior to 1.14.5, the CoreDNS rewrite plugin supports ed…nvd

Recent advisories for CoreDNS

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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mediumCVE-2026-62299: CoreDNS is a DNS server written in Go. Prior to 1.14.5, the CoreDNS rewrite plugin supports ed…nvd · 2026-07-16
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