CoreDNS: rewrite-plugin EDNS0 response-revert nil-pointer panic (remote DoS) when a downstream plugin returns a response with no OPT record
Description
A vulnerability in CoreDNS's rewrite-plugin can cause a nil-pointer panic leading to a remote denial of service (DoS) when a downstream plugin returns a response without an OPT record in the EDNS0 section. This issue affects CoreDNS version 3.0. No CVSS score or detailed vendor advisory is available.
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The CoreDNS rewrite-plugin has a flaw where it does not properly handle EDNS0 responses that lack an OPT record. When a downstream plugin returns such a response, the rewrite-plugin dereferences a nil pointer, causing a panic and resulting in a remote denial of service condition. This vulnerability is identified as CWE-476 (NULL Pointer Dereference) and affects CoreDNS version 3.0.
Potential Impact
An attacker can remotely cause the CoreDNS server to crash or become unavailable by sending a specially crafted DNS response that triggers the nil-pointer panic in the rewrite-plugin. This leads to a denial of service, disrupting DNS resolution services relying on the affected CoreDNS instance.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, consider disabling the rewrite-plugin or avoiding configurations where downstream plugins might return responses without OPT records.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_vex
- Csaf Version
- 2.0
- Publisher
- Microsoft Security Response Center
- Advisory Id
- msrc_CVE-2026-62299
- Cve Count
- 1
Threat ID: 6a5b60912d1edb114c84a45b
Added to database: 07/18/2026, 11:16:33 UTC
Last enriched: 09/16/2026, 23:21:06 UTC
Last updated: 10/16/2026, 06:48:18 UTC
Views: 95
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