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Fencer Vulns
medium 4.9

CVE-2026-42396 json

Insufficient Validation of Member Zone Data May Cause Catalog Zone Transfer to Fail

published 2026-05-21 5 mo ago modified 2026-07-23 3 mo ago also EUVD-2026-31265

cvss
4.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 29%
public exploits
0
none known

Summary

Insufficient Validation of Member Zone Data May Cause Catalog Zone Transfer to Fail

Patch / fix

  • PowerDNS Authoritative 4.9.15, 5.0.5
  • pdns Debian 13 4.9.15-0+deb13u1
  • pdns Debian 14 5.0.5-1

debian advisories DEBIAN-CVE-2026-42396

  • pdns Alpine 3.24, Alpine 3.23 5.0.5-r0

alpine advisories ALPINE-CVE-2026-42396

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-42396 updated cvss 4.9

pdns: PowerDNS: Denial of Service due to insufficient validation of member zone data during catalog zone transfer.

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
5 mo ago

Exploit prediction

0.35% chance of exploitation in the next 30 days, higher than 29% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 4.9 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

  • PowerDNS Authoritative

Classification

Weakness
  • CWE-94 Improper Control of Generation of Code

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.