CVE-2026-27831

high

Description

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.

References

https://medium.com/@w1sdom/heap-based-buffer-over-read-vulnerability-in-rldns-1-3-5da3bccdc031

https://github.com/bluedragonsecurity/rldns_archives/blob/main/diff/rldns-1.4.diff

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

Details

Source: Mitre, NVD

Published: 2026-02-26

Updated: 2026-02-27

Risk Information

CVSS v2

Base Score: 7.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C

Severity: High

CVSS v3

Base Score: 7.5

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