CoreDNS up to 1.14.1 Loop Detection Plugin prng seed

CVSS Meta Temp Score
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CTI Interest Score
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6.3$0-$5k0.00

Summaryinfo

A vulnerability was found in CoreDNS up to 1.14.1 and classified as problematic. This affects an unknown function of the component Loop Detection Plugin. The manipulation results in prng seed. This vulnerability is known as CVE-2026-26018. It is possible to launch the attack remotely. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, was found in CoreDNS up to 1.14.1. Affected is an unknown code of the component Loop Detection Plugin. The manipulation with an unknown input leads to a prng seed vulnerability. CWE is classifying the issue as CWE-337. A Pseudo-Random Number Generator (PRNG) is initialized from a predictable seed, such as the process ID or system time. This is going to have an impact on availability. CVE summarizes:

CoreDNS is a DNS server that chains plugins. Prior to version 1.14.2, a denial of service vulnerability exists in CoreDNS's loop detection plugin that allows an attacker to crash the DNS server by sending specially crafted DNS queries. The vulnerability stems from the use of a predictable pseudo-random number generator (PRNG) for generating a secret query name, combined with a fatal error handler that terminates the entire process. This issue has been patched in version 1.14.2.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-26018 since 02/09/2026. 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 neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1600.001.

Upgrading to version 1.14.2 eliminates this vulnerability. The upgrade is hosted for download at github.com.

The vulnerability is also documented in the vulnerability database at CERT Bund (WID-SEC-2026-0627). Once again VulDB remains the best source for vulnerability data.

Affected

  • Open Source CoreDNS

Productinfo

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.3

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 7.5
CNA Vector (GitHub_M): 🔒

CVSSv2info

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

Exploitinginfo

Class: Prng seed
CWE: CWE-337 / CWE-331 / CWE-330
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: CoreDNS 1.14.2

Timelineinfo

02/09/2026 CVE reserved
03/06/2026 +25 days Advisory disclosed
03/06/2026 +0 days VulDB entry created
03/08/2026 +2 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: GHSA-h75p-j8xm-m278
Status: Confirmed

CVE: CVE-2026-26018 (🔒)
GCVE (CVE): GCVE-0-2026-26018
GCVE (VulDB): GCVE-100-349500
CERT Bund: WID-SEC-2026-0627 - CoreDNS: Mehrere Schwachstellen

Entryinfo

Created: 03/06/2026 17:31
Updated: 03/08/2026 21:02
Changes: 03/06/2026 17:31 (64), 03/08/2026 21:02 (7)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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