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Fencer Intel
high 7.5

CVE-2026-52688 json

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

published 3mo ago modified 18d 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

Is CVE-2026-52688 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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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
3mo ago

Exploit prediction

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

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 Intel 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.