Skip to content
Noroxi
NVD / CVE Program· CNA GitHub_M

CVE-2026-26017: CoreDNS is a DNS server that chains plugins.

Noroxi assessment

Priority: Monitor (action score 25/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.40% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. A low-privileged account is enough. No user action is required. Special conditions such as timing or configuration are required.
  • Fixed version: coredns coredns 1.14.2; azl3 coredns 1.11.4-14 on Azure Linux 3.0 1.11.4-15; cbl2 coredns 1.11.1-25 on CBL Mariner 2.0 1.11.1-26.

Low priority for now. Upgrade to coredns coredns 1.14.2; azl3 coredns 1.11.4-14 on Azure Linux 3.0 1.11.4-15; cbl2 coredns 1.11.1-25 on CBL Mariner 2.0 1.11.1-26 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

CoreDNS is a DNS server that chains plugins. Prior to version 1.14.2, a logical vulnerability in CoreDNS allows DNS access controls to be bypassed due to the default execution order of plugins. Security plugins such as acl are evaluated before the rewrite plugin, resulting in a Time-of-Check Time-of-Use (TOCTOU) flaw. This issue has been patched in version 1.14.2.

MediumCVSS 6.3 · v3.1—No exploit Fix available
Published
Mar 6, 2026
Updated
Jul 15, 2026
EPSS
0.4% · 34th percentile

Report tools

JSON

Action score

25

Monitor

Low priority for now.

CVSS
25 / 40 · 6.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.4%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
6.3
CNA · GitHub_M
7.7
1.4 point gap

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-26017

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

One daily email digest (06:00 UTC); connect a webhook for KEV listings and weaponized exploits instantly.

Your free account also gets you

Running WordPress? Scan your site free with WP Lens

  • Stack alerts: add the products and versions you run, get the new CVEs that affect them
  • Uptime monitoring: 1 site, instant email when it goes down
  • Add your domain: subdomains and takeover risk scanned every week (1 domain)
  • 10 scans an hour on the security tools (3 a day without an account), an API key and MCP
  • All your scans in one panel: findings, what changed in the last scan, a report per domain or per client (PDF, share link)
All free tools

Sign up with email · Have an account? Sign in

Free account, no card. Unfollow any time.

Don't want an account? Get "Exploited this week" by email every MondayDon't want an account? RSS feed for coredns.io records

Running WordPress? Scan your site free with WP Lens

Is your version affected? Check it

Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

We use this product, ask for help

Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
coredns.iocoredns

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • coredns.io corednsbefore 1.14.2

Versions reported by the vendor

Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.

  • coredns coredns

    • < 1.14.2affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Gogithub.com/coredns/corednsbefore 1.14.21.14.2
openSUSE:Leap 15.6govulncheck-vulndbbefore 0.0.20260317T205859-150000.1.152.10.0.20260317T205859-150000.1.152.1
openSUSE:Leap 16.0corednsbefore 1.14.2-bp160.1.11.14.2-bp160.1.1
openSUSE:Tumbleweedcorednsbefore 1.14.2-1.11.14.2-1.1

Same product

coredns.io: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-33190CoreDNS TSIG authentication bypass on encrypted DNS transports
    34Monitor
  • CVE-2026-32936CoreDNS DoH GET path missing size validation causes CPU and memory amplification
    34Monitor
  • CVE-2026-32934CoreDNS DNS-over-QUIC unbounded goroutine growth leads to denial of service
    34Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2025-47950Jun 6, 2025 · CoreDNS Vulnerable to DoQ Memory Exhaustion via Stream Amplification
    30Monitor
  • ← EarlierCVE-2025-68151Jan 8, 2026 · CoreDNS gRPC/HTTPS/HTTP3 servers lack resource limits, enabling DoS via unbounded connections and oversized messages
    26Monitor
  • Later →CVE-2026-26018Mar 6, 2026 · CoreDNS Loop Detection Denial of Service Vulnerability
    30Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
coredns coredns1.14.2 · descriptionVendor (CNA)
azl3 coredns 1.11.4-14 on Azure Linux 3.01.11.4-15 · CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 coredns 1.11.1-25 on CBL Mariner 2.01.11.1-26 · CBL-Mariner ReleasesMicrosoft (MSRC)
Go:github.com/coredns/coredns1.14.2Package registry (OSV)
opensuse:coredns1.14.2-1.1 · openSUSE:TumbleweedPackage registry (OSV)
opensuse:govulncheck-vulndb0.0.20260317T205859-150000.1.152.1 · openSUSE:Leap 15.6Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
high · data can be read
Integrity
none
Availability
none

Impact can extend beyond the vulnerable component (scope changes).

Attack vector
Network
Attack complexity
High
Privileges required
Low
User interaction
None
Scope
Changed
Confidentiality impact
High
Integrity impact
None
Availability impact
None

Weakness class (CWE)

CWE-367 · Time-of-check Time-of-use (TOCTOU) Race Condition

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records