CVE-2026-27831 PUBLISHED

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

Assigner: GitHub_M
Reserved: 24.02.2026 Published: 26.02.2026 Updated: 26.02.2026

rldns is an open source DNS server. Version 2.3 has a heap-based out-of-bounds read that leads to denial of service. Version 1.4 contains a patch for the issue.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS Score: 7.5

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	None
Privileges Required	None	Integrity Impact	None
User Interaction	None	Availability Impact	High

CVSS 3.1

Product Status

Vendor	bluedragonsecurity
Product	rldns
Versions	Version = 1.3 is affected

References

https://github.com/bluedragonsecurity/rldns/security/advisories/GHSA-fv38-45j4-g9x4
https://github.com/bluedragonsecurity/rldns-1.3-heap-out-of-bounds-vulnerability-fixed-in-rldns-1.4
https://github.com/bluedragonsecurity/rldns_archives/blob/main/diff/rldns-1.4.diff
https://medium.com/@w1sdom/heap-based-buffer-over-read-vulnerability-in-rldns-1-3-5da3bccdc031

Problem Types

CWE-125: Out-of-bounds Read CWE