Vulnerability-Lookup

CVE-2026-62299 (GCVE-0-2026-62299)

Vulnerability from cvelistv5 – Published: 2026-07-16 19:44 – Updated: 2026-07-17 18:06

Title

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

Summary

CoreDNS is a DNS server written in Go. Prior to 1.14.5, the CoreDNS rewrite plugin supports edns0 rewrite rules with an optional revert flag, and two response rules, edns0SetResponseRule and edns0ReplaceResponseRule[T] in plugin/rewrite/edns0.go, call res.IsEdns0() and immediately dereference the returned *dns.OPT without a nil check when a downstream plugin returns a response with no OPT record. A remote, unauthenticated client can send a single ordinary DNS query matching a rewrite edns0 <local|nsid|subnet> <set|append|replace> ... revert rule, causing ResponseReverter in plugin/rewrite/reverter.go to panic, return SERVFAIL, and degrade availability, or crash the CoreDNS process if the debug directive disables recovery. This issue is fixed in version 1.14.5.

Severity

5.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-17 17:11 UTC

CWE

CWE-476 - NULL Pointer Dereference

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 8129 records in the last 180 days details

References

4 references

URL	Tags
https://github.com/coredns/coredns/security/advis…	x_refsource_CONFIRM
https://github.com/coredns/coredns/pull/8190	x_refsource_MISC
https://github.com/coredns/coredns/commit/fc447d0…	x_refsource_MISC
https://github.com/coredns/coredns/releases/tag/v1.14.5	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
coredns	coredns	Affected: < 1.14.5	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-62299

Vulnerability from fkie_nvd - Published: 2026-07-16 20:16 - Updated: 2026-07-22 20:18

Severity

5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Summary

References

URL	Tags
security-advisories@github.com	https://github.com/coredns/coredns/commit/fc447d0658b093edc8cd29a6b171216a44a644c2	Patch
security-advisories@github.com	https://github.com/coredns/coredns/pull/8190	Issue Tracking, Patch
security-advisories@github.com	https://github.com/coredns/coredns/releases/tag/v1.14.5	Release Notes
security-advisories@github.com	https://github.com/coredns/coredns/security/advisories/GHSA-9pmm-cxww-rrr7	Exploit, Third Party Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/coredns/coredns/security/advisories/GHSA-9pmm-cxww-rrr7	Exploit, Third Party Advisory

Impacted products

	Vendor	Product	Version
	coredns.io	coredns	*

JSON

To clipboard

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          "product": "coredns",
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      "source": "security-advisories@github.com",
      "tags": [
        "Issue Tracking",
        "Patch"
      ],
      "url": "https://github.com/coredns/coredns/pull/8190"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Release Notes"
      ],
      "url": "https://github.com/coredns/coredns/releases/tag/v1.14.5"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "url": "https://github.com/coredns/coredns/security/advisories/GHSA-9pmm-cxww-rrr7"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "url": "https://github.com/coredns/coredns/security/advisories/GHSA-9pmm-cxww-rrr7"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

MSRC_CVE-2026-62299

Vulnerability from csaf_microsoft - Published: 2026-07-18 01:01 - Updated: 2026-07-21 01:41

Summary

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

Scope

1 vulnerability in this advisory, including CVE-2026-62299.

CVE-2026-62299

5.3 (Medium)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Fixed: 1 product Known affected: 1 product

https://learn.microsoft.com/en-us/azure/azure-linux/tutoria…

Open the full advisory

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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CVE-2026-62299 (GCVE-0-2026-62299)

FKIE_CVE-2026-62299

MSRC_CVE-2026-62299

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