CVE-2026-27831 - Vulnerability Analysis

Overview

rldns 2.3 contains a heap-based out-of-bounds read in the DNS server component, letting attackers cause denial of service, exploit requires no special privileges.

Severity & Score

Impact

Attackers can cause denial of service by triggering a heap-based out-of-bounds read.

Mitigation

Update to version 1.4 or later.

References

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

Social Media Activity(1 post)

TheHackerWire

@thehackerwire

Feb 26, 2026

🟠 CVE-2026-27831 - High (7.5) rldns is an open source DNS server. Version 2.3 has a heap-based out-of-bounds read that leads to denial of service. Version 1.4 contains a patch for the issue. 🔗 https://www.thehackerwire.com/vulnerability/CVE-2026-27831/ #CVE #vulnerability #infosec #cybersecurity #security #Tenda #patchstack

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GitHub Repositories(1 repo)

• https://github.com/bluedragonsecurity/CVE-2026-27831-POC

Related Resources

• Vulnerability Intelligence Dashboard
• Credential Scanner