8.7

CVE-2026-12245: nlnet labs nsd Use After Free

CVSS: 8.7v4.0HighAnalyzed
AliasesALPINE-CVE-2026-12245UBUNTU-CVE-2026-12245DEBIAN-CVE-2026-12245
Published 25-06-2026Last modified 25-06-2026
Open JSON

Vulnerability summary

CVE-2026-12245 is a high (CVSS 8.7) Use After Free vulnerability in nlnet labs nsd. EPSS estimates a 0.46% chance of exploitation in the next 30 days, higher than 38.5% of scored vulnerabilities.

Overall risk
35/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.7/10
010
High · v4.0 (CVE.org)
EPSS score
0.46%
0%100%
Low · +0.14 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 2 · Related 3
OPENSUSE-SU-2026:11395-1OPENSUSE-SU-2026:21502-1USN-8474-1

Timeline

  1. 25-06-2026
    PublishedVulnerability first disclosed.
  2. 25-06-2026
    Last modifiedVulnerability information updated.

Description

NSD from version 4.13.0 has a heap use-after-free bug in logging errors on TLS connections, causing a crash of the server process, which can be triggered trivially by sending a DNS query over a DoT connection, and closing the connection without reading the response.

CVSS metrics

7 scores · 5 sources · 2 versions

EPSS trend

Probability

0.46%

Chance of exploitation in the next 30 days

Percentile

39%

Versus all other CVEs

30-day change

+0.14 pp

From 0.32% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.46%

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

Alpine1 product
  • nsd≥ 4.13.0, < 4.14.3-r0
Debian1 product
  • nsd< 4.14.3-1
Nlnet labs1 product
  • nsd≥ 4.13.0, < 4.14.3
Nlnetlabs1 product
  • nsd≥ 4.13.0, < 4.14.3
Ubuntu1 product
  • nsdAll versions (No fix recorded) | < 4.14.0-1ubuntu0.1~esm1

5 vendors · 5 products

References

6 links