CVE-2026-33611: An operator allowed to use the REST API can cause the Authoritative server to produce invalid HTTPS or SVCB re

Routine

MEDIUM 6.5UPGRADE

CVE-2026-33611 is a medium-severity flaw (CVSS 6.5) affecting authoritative. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An operator allowed to use the REST API can cause the Authoritative server to produce invalid HTTPS or SVCB record data, which can in turn cause LMDB database corruption, if using the LMDB backend.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.4% (top 64%)
CISA exploited list	No
Weakness	CWE-190
Published	2026-04-22
Last modified	2026-10-26

Publisher (CNA): Open-Xchange · Vendor: powerdns

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-22 14:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

powerdns authoritative UPGRADE

Affected: >= 4.9.0 and < 4.9.14 · >= 5.0.0 and < 5.0.4

Fixed in: 4.9.14, 5.0.4

Safe to downgrade to: a release before 4.9.0

1. Check installed version

apt-cache policy authoritative || rpm -q authoritative || authoritative --version

2. UPGRADE to 4.9.14 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade authoritative

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade authoritative

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 4.9.0 (Debian / Ubuntu)

apt-cache madison authoritative sudo apt install authoritative=<VERSION_BEFORE_4.9.0> sudo apt-mark hold authoritative

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list authoritative sudo dnf downgrade authoritative-<VERSION_BEFORE_4.9.0> sudo dnf versionlock add authoritative

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-33611?

authoritative: upgrade to 4.9.14, 5.0.4. Exact commands for each OS are on this page.

Is CVE-2026-33611 being exploited?

CVE-2026-33611 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-33611 affect?

CVE-2026-33611 affects authoritative. Severity is medium (CVSS 6.5). An operator allowed to use the REST API can cause the Authoritative server to produce invalid HTTPS or SVCB record data, which can in turn cause LMDB database corruption, if using the LMDB backend.

How urgent is CVE-2026-33611?

Priority 32/100. No elevated risk signals yet.

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References

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