No exploitation reportedFix available

CVE-2026-27854

Q: Is CVE-2026-27854 actively exploited?

Active exploitation of CVE-2026-27854 has not been confirmed. Its EPSS score was 1.3% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2026-27854?

CVE-2026-27854 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

No exploitation reported by the sources we read.

Published2026-03-31
Fixed in2.0.3 · 1.9.12
WeaknessCWE-416

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

An attacker might be able to trigger a use-after-free by sending crafted DNS queries to a DNSdist using the DNSQuestion:getEDNSOptions method in custom Lua code. In some cases DNSQuestion:getEDNSOptions might refer to a version of the DNS packet that has been modified, thus triggering a use-after-free and potentially a crash resulting in denial of service.

Timeline

dates in UTC

2026-03-3112:16CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-27854?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-27854?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Powerdns dnsdist

Branch	Affected	Fixed in	Source
2.0	≥ 2.0.0, < 2.0.3	2.0.3	NVD
1.9	≥ 1.9.0, < 1.9.12	1.9.12	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update Powerdns dnsdist to 2.0.3 · 1.9.12

Advisories and patches

www.dnsdist.orgVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

CISA-ADPSSVC decisionnone2026-03-31
OpenCVESSVC decisionnone—
CNACVSS 3.14.8read 2026-10-23
NVDCVSS 3.17.5read 2026-10-23
CISA-ADPweakness (CWE)CWE-4162026-03-31
FIRST EPSSEPSS score1.3 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2026-03-31
Last Modified: 2026-07-25
NVD status: Analyzed

Frequently asked questions

What is CVE-2026-27854?

Is CVE-2026-27854 actively exploited?

Active exploitation of CVE-2026-27854 has not been confirmed. Its EPSS score was 1.3% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-27854?

CVE-2026-27854 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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