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
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.007 (49.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 49.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.007 · change: +0.002
Affected products
- Bluedragonsecurity Rldns — versions = 1.3
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/bluedragonsecurity/rldns/security/advisories/GHSA-fv38-45j4-g9x4
- github.com/bluedragonsecurity/rldns-1.3-heap-out-of-bounds-vulnerability-fixed-…
- github.com/bluedragonsecurity/rldns_archives/blob/main/diff/rldns-1.4.diff
- medium.com/@w1sdom/heap-based-buffer-over-read-vulnerability-in-rldns-1-3-5da3b…
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.
- Is CVE-2026-27831 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.