CVE-2026-62299: CoreDNS is a DNS server written in Go

Q: How do I fix CVE-2026-62299?

coredns: upgrade to 1.14.5. Exact commands for each OS are on this page.

Q: Is CVE-2026-62299 being exploited?

CVE-2026-62299 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-62299 affect?

CVE-2026-62299 affects coredns. Severity is medium (CVSS 5.3). 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/edn

Q: How urgent is CVE-2026-62299?

Priority 40/100. Public exploit reference; Remotely exploitable, no login, no user action

This week

MEDIUM 5.3REMOTEUPGRADE

CVE-2026-62299 is a medium-severity flaw (CVSS 5.3) affecting coredns. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 55%)
CISA exploited list	No
Weakness	CWE-476
Published	2026-07-16
Last modified	2026-07-22

Publisher (CNA): GitHub, Inc. · Vendor: coredns.io

Last updated 2026-07-22 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-16 20:16 UTCPublished CVE record published
2026-07-22 20:18 UTCUpdated Record last modified

coredns.io coredns UPGRADE

Affected: < 1.14.5

Fixed in: 1.14.5

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy coredns || rpm -q coredns || coredns --version

2. UPGRADE to 1.14.5 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade coredns

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade coredns

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-62299?

coredns: upgrade to 1.14.5. Exact commands for each OS are on this page.

Is CVE-2026-62299 being exploited?

CVE-2026-62299 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-62299 affect?

CVE-2026-62299 affects coredns. Severity is medium (CVSS 5.3). 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/edn

How urgent is CVE-2026-62299?

Priority 40/100. Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-62309 HIGH 7.5 UPGRADE CoreDNS is a DNS server written in Go
CVE-2026-62994 LOW 3.7 UPGRADE CoreDNS is a DNS server written in Go

References

← Back to latest CVEs