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Fencer Vulns
high 7.5

CVE-2026-52688 json

RRSIGs with too few labels can lead to bypass of DNSSEC wildcard validation

published 2026-07-23 3 mo ago modified 2026-10-24 15 d ago also EUVD-2026-47930

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 7%
public exploits
0
none known

Summary

RRSIGs with too few labels can lead to bypass of DNSSEC wildcard validation

Patch / fix

  • PowerDNS Recursor 5.2.12, 5.3.9, 5.4.4
  • pdns-recursor Debian 13 5.2.12-0+deb13u1
  • pdns-recursor Debian 14 5.4.4-1

debian advisories DEBIAN-CVE-2026-52688

  • pdns-recursor Alpine 3.24 5.4.4-r0

alpine advisories ALPINE-CVE-2026-52688

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-2026-52688 updated cvss 7.5

pdns-recursor: RRSIGs with too few labels can lead to bypass of DNSSEC wildcard validation

  • 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
yes
Technical impact
partial
Assessed
3 mo ago

Exploit prediction

0.18% chance of exploitation in the next 30 days, higher than 7% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected products

  • PowerDNS Recursor

Classification

Weakness
  • CWE-345 Insufficient Verification of Data Authenticity
  • CWE-295 Improper Certificate Validation

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.