CVE-2026-27831

HIGH 7.5

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

CVSS Score

7.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-125
Vendor	bluedragonsecurity
Product	rldns
Published	Feb 26, 2026
Last Updated	Feb 27, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Affected Versions

bluedragonsecurity / rldns

= 1.3

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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