7.5

CVE-2026-27854: powerdns dnsdist Use After Free

CVSS: 7.5v3.1HighAnalyzed
AliasesUBUNTU-CVE-2026-27854DEBIAN-CVE-2026-27854
Published 31-03-2026Last modified 02-04-2026
Open JSON

Vulnerability summary

CVE-2026-27854 is a high (CVSS 7.5) Use After Free vulnerability in powerdns dnsdist. EPSS estimates a 1.34% chance of exploitation in the next 30 days, higher than 70.8% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (NVD)
EPSS score
1.34%
0%100%
Low · +0.87 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 4 · Related 4
OPENSUSE-SU-2026:10473-1OPENSUSE-SU-2026:21015-1SUSE-SU-2026:1618-1SUSE-SU-2026:22319-1

Timeline

  1. 31-03-2026
    PublishedVulnerability first disclosed.
  2. 02-04-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

1.34%

Chance of exploitation in the next 30 days

Percentile

71%

Versus all other CVEs

30-day change

+0.87 pp

From 0.47% on 19-09-2026

19-09-202619-10-2026
EPSS score
1.34%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • dnsdistAll versions (No fix recorded) | < 1.9.14-0+deb13u1 | < 2.0.3-1
Powerdns1 product
  • dnsdist≥ 1.9.0, < 1.9.12 | ≥ 2.0.0, < 2.0.3
Ubuntu1 product
  • dnsdistAll versions (No fix recorded)

3 vendors · 3 products

References

5 links