🛡️ CVE-2026-33612 on Debian — pdns-recursor

⚪ Unknown ✅ No Known Exploit OSV

N/A

CVSS Score

0 Low4 Medium7 High9 Critical10

Description

A malicious authoritative server can send a crafted zone via the ZoneToCache function that leads to cache poisoning.

Distribution advisory

This page covers CVE-2026-33612 as tracked by Debian, for the package pdns-recursor. The fix is available in version 5.4.3-1; earlier versions remain affected.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is high, an attacker needs no privileges on the target. No user interaction is required. The scope is changed, meaning a successful attack can affect components beyond the vulnerable one. Rated impact: confidentiality none, integrity high, availability low.

Weakness class

DEBIAN-CVE-2026-33612 is classified as CWE-349: Acceptance of Extraneous Untrusted Data With Trusted Data. The product, when processing trusted data, accepts any untrusted data that is also included with the trusted data, treating the untrusted data as if it were trusted.

Affected software

DEBIAN-CVE-2026-33612 is recorded against 1 package.

pdns-recursor (fixed in 5.4.3-1)

Timeline and source

Published on 25 June 2026 and last revised on 4 August 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

security-tracker.debian.org (Advisory)

Details

Severity Unknown

CVSS Score N/A

CVSS Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:L

CWE N/A

Public Exploit ✅ No

Source OSV

Published 2026-06-25

Updated 2026-08-12

Modified 2026-08-04

Fix URL N/A

Affected Packages

Software	From version	Fixed in
pdns-recursor	—	5.4.3-1

References

ADVISORY https://security-tracker.debian.org/tracker/CVE-2026-33612

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