CoreDNS up to 1.14.4 Rewrite Plugin plugin/rewrite/edns0.go IsEdns0 null pointer dereference

CVSS Meta Temp Score
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CTI Interest Score
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7.2$0-$5k2.09+

Summaryinfo

A vulnerability was found in CoreDNS up to 1.14.4. It has been declared as critical. Affected by this issue is the function IsEdns0 of the file plugin/rewrite/edns0.go of the component Rewrite Plugin. The manipulation results in null pointer dereference. This vulnerability is cataloged as CVE-2026-62299. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in CoreDNS up to 1.14.4. It has been classified as critical. Affected is the function IsEdns0 of the file plugin/rewrite/edns0.go of the component Rewrite Plugin. The manipulation with an unknown input leads to a null pointer dereference vulnerability. CWE is classifying the issue as CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. This is going to have an impact on availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-62299 since 07/13/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available.

Upgrading to version 1.14.5 eliminates this vulnerability.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 7.2

VulDB Base Score: 7.5
VulDB Temp Score: 7.2
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Upgrade: CoreDNS 1.14.5

Timelineinfo

07/13/2026 CVE reserved
07/16/2026 +3 days Advisory disclosed
07/16/2026 +0 days VulDB entry created
07/16/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-62299 (🔒)
GCVE (CVE): GCVE-0-2026-62299
GCVE (VulDB): GCVE-100-379644

Entryinfo

Created: 07/16/2026 22:29
Changes: 07/16/2026 22:29 (54)
Complete: 🔍
Cache ID: 216::103

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