Vulnerability · Published Jul 23, 2026 · Assigned by OX
CVE-2026-52688RRSIGs with too few labels can lead to bypass of DNSSEC wildcard validation
High 7.5
In plain English
A high-severity insufficient verification of data authenticity in Recursor from PowerDNS. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 7% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.2%top 92.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
RRSIGs with too few labels can lead to bypass of DNSSEC wildcard validation
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.24 | pdns-recursor | 5.4.4-r0 | ALPINE-CVE-2026-52688 |
| Debian:12 | pdns-recursor | no fix listed | DEBIAN-CVE-2026-52688 |
| Debian:13 | pdns-recursor | 5.2.12-0+deb13u1 | DEBIAN-CVE-2026-52688 |
| Debian:14 | pdns-recursor | 5.4.4-1 | DEBIAN-CVE-2026-52688 |
| Ubuntu:24.04:LTS | pdns-recursor | no fix listed | UBUNTU-CVE-2026-52688 |
| Ubuntu:26.04:LTS | pdns-recursor | no fix listed | UBUNTU-CVE-2026-52688 |
| Ubuntu:26.10 | pdns-recursor | no fix listed | UBUNTU-CVE-2026-52688 |
Affected products (as reported)
Weakness: CWE-345, CWE-295 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N