CVE catalog
CVE-2026-42389
This fix provides extra hardening for the 5.4.x branch by doing extra validation of incoming answers from authoritative servers.
- Severity
- Medium · CVSS 5.3
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.30% · Oct 25, 2026
This fix provides extra hardening for the 5.4.x branch by doing extra validation of incoming answers from authoritative servers.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | pdns-recursor | sid | 5.4.9-1 | fixed |
| Debian | pdns-recursor | forky | 5.4.8-1 | fixed |
| Debian | pdns-recursor | trixie | 5.2.13-0+deb13u1 | not affected |
| Debian | pdns-recursor | trixie-security | 5.2.13-0+deb13u1 | not affected |
| Debian | pdns-recursor | bookworm | 4.8.8-1+deb12u1 | not affected |
| Debian | pdns-recursor | bookworm-security | 4.8.8-1+deb12u1 | not affected |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | pdns-recursor | source | sid | 5.4.3-1 | not yet assigned | Not reported | Not reported |
| Debian | pdns-recursor | source | forky | 5.4.3-1 | not yet assigned | Not reported | Not reported |
| Debian | pdns-recursor | source | trixie | Not affected | unimportant | Not reported | Not reported |
| Debian | pdns-recursor | source | bookworm | Not affected | unimportant | Not reported | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [pdns-recursor]Not affected
Details (4)
4.8.8-1+deb12u1· amd64 · bookwormNot affected
nvd · pdns-recursor · debian · bookworm
4.8.8-1+deb12u1· arm64 · bookwormNot affected
nvd · pdns-recursor · debian · bookworm
4.8.8-1+deb12u1· amd64 · bookworm-securityNot affected
nvd · pdns-recursor · debian · bookworm
4.8.8-1+deb12u1· arm64 · bookworm-securityNot affected
nvd · pdns-recursor · debian · bookworm
Observed:
References
- [https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-powerdns-2026-08.html]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-42389]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-42389]
- [https://security-tracker.debian.org/tracker/CVE-2026-42389]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42389.json]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-2091.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]