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Vulnerability record · CVE-2026-27831 · published 26 February 2026

CVE-2026-27831: Out-of-bounds read vulnerability

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.

7.5 CVSS 3.1 High EPSS 0.65% · top 50.7% CWE-125 · Out-of-bounds read Deferred
7.5CVSS 3.1 base score
0.65%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
5References
17 Jun 2026Last modified by NVD

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.

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

References

LinkTags
https://github.com/bluedragonsecurity/rldns-1.3-heap-out-of-bounds-vulnerability-fixed-in-rldns-1.4
https://github.com/bluedragonsecurity/rldns/security/advisories/GHSA-fv38-45j4-g9x4
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
https://github.com/bluedragonsecurity/rldns/security/advisories/GHSA-fv38-45j4-g9x4

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-27831), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.