CVE-2026-27831

HIGHNVD 7.57.5—Elevated

7.5

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 v3: 7.5
EG Score: 7.5(medium)
EPSS: 19.5%
KEV: Not listed

Published

February 26, 2026

Last Modified

April 15, 2026

References (5)

security-advisories@githubhttps://github.com/bluedragonsecurity/rldns-1.3-heap-out-of-bounds-vulnerability-fixed-in-rldns-1.4
security-advisories@githubhttps://github.com/bluedragonsecurity/rldns/security/advisories/GHSA-fv38-45j4-g9x4
security-advisories@githubhttps://github.com/bluedragonsecurity/rldns_archives/blob/main/diff/rldns-1.4.diff
security-advisories@githubhttps://medium.com/@w1sdom/heap-based-buffer-over-read-vulnerability-in-rldns-1-3-5da3bccdc031
134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/bluedragonsecurity/rldns/security/advisories/GHSA-fv38-45j4-g9x4

Data Freshness Timeline

(refreshed 17× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

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2026-05-23 00:09 UTCEG score recompute

Frequently asked(5)

What is CVE-2026-27831?

CVE-2026-27831 is a high vulnerability published on February 26, 2026. 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.

When was CVE-2026-27831 disclosed?

CVE-2026-27831 was first published in the National Vulnerability Database on February 26, 2026, with the most recent update on April 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2026-27831 actively exploited?

CVE-2026-27831 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 19.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2026-27831?

CVE-2026-27831 has a CVSS v3 base score of 7.5 (NVD).

How do I remediate CVE-2026-27831?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-27831, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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CVE-2026-27831

📅 Published

🔄 Last Modified

🔗 References (5)