| Name | CVE-2026-42389 |
| Description | This fix provides extra hardening for the 5.4.x branch by doing extra validation of incoming answers from authoritative servers. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| pdns-recursor (PTS) | bullseye | 4.4.2-3 | fixed |
| bookworm, bookworm (security) | 4.8.8-1+deb12u1 | fixed |
| trixie (security), trixie | 5.2.11-0+deb13u1 | fixed |
| forky, sid | 5.4.3-1 | fixed |
The information below is based on the following data on fixed versions.
Notes
[trixie] - pdns-recursor <not-affected> (Vulnerable code not present, only affects 5.4.x)
[bookworm] - pdns-recursor <not-affected> (Vulnerable code not present, only affects 5.4.x)
[bullseye] - pdns-recursor <not-affected> (Vulnerable code not present, only affects 5.4.x)
https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2026-08.html#cve-2026-42389-reject-more-queries-with-invalid-header-values