SB2026072439 - Debian update for pdns-recursor
Published: July 24, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 2 vulnerabilities.
1) Insufficient verification of data authenticity (CVE-ID: CVE-2026-52686)
CWE-ID: CWE-345 - Insufficient Verification of Data Authenticity
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a remote attacker to poison the cache.
The vulnerability exists due to improper validation in the wildcard CNAME proof validation logic when processing a crafted reply from an authoritative server containing specific wildcards. A remote attacker can send a crafted reply to poison the cache.
Exploitation is limited to very specific cases outside of the attacker's control.
2) Insufficient verification of data authenticity (CVE-ID: CVE-2026-52688)
CWE-ID: CWE-345 - Insufficient Verification of Data Authenticity
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
The vulnerability allows a remote attacker to bypass DNSSEC wildcard validation.
The vulnerability exists due to insufficient validation of DNSSEC signatures in the DNSSEC wildcard validation logic when processing a crafted reply from an authoritative server. A remote attacker can send a crafted reply to bypass DNSSEC wildcard validation.
Remediation
Install update from vendor's website.