Out-of-bounds Read in Bluedragonsecurity Rldns

CVE-2026-27831

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.

Vulnerability class: Buffer Overflow

EPSS: 0.004 (35.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-27831?
CVE-2026-27831 is a high-severity vulnerability in Bluedragonsecurity Rldns, classified under Out-of-bounds Read. CVSS score: 7.5/10. Published 2026-02-26.
How severe is CVE-2026-27831?
High severity. CVSS v3 base score is 7.5 out of 10.