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Tool Directory

CVE-2026-27831

HighPublished

rldns Vulnerable to Heap-based Out-of-Bounds Read

Published: Feb 26, 2026
Updated: Feb 27, 2026
Assigning CNA: GitHub_M
Evidence observed: Aug 25, 2026

Primary CVSS

7.5/ 10High

nvd · CVSS 3.1

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

EPSS probability estimate

0.4%

Low · next 30 days

Percentile: 36.3%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

rldns is an open source DNS server. Version 1.3 has a heap-based out-of-bounds read that leads to denial of service. Version 1.4 contains a patch for the issue.

Sources

CVE-2026-27831-POCPoC
Poc Exploit for CVE-2026-27831 - vulnerability discovered by : Antonius

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