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CWE-346Weakness · CWE-346

CVE-2026-13321

HIGH · 8.6 CVSS v3.1 Developing Published 2026-07-22
No fix yet
No fix has been published. The vendor has not shipped a fixed release or patch. You remain exposed.
See remediation →
95/100
Remediation priority · Urgent
Remotely reachable No privileges Zero-click 5 weeks old

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
The BIND resolver accepts validly-signed NSEC records where the "Next Domain Name" field points outside the signer's zone. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · low confidence
Developing — this CVE was published recently and its authoritative NVD entry is still being established, so we're holding a technical summary until the source data settles rather than publish something unreliable. Re-checking after 2026-08-05.

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Scope
Changed
Confidentiality
None
Integrity
High
Availability
None

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

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Recommended fix Moderate confidence

BIND 9.18.51+ / 9.20.25+ / 9.21.24+ (or latest stable 9.22.x if available)

  1. 1. Identify the currently installed BIND 9 version using: `named -v` or `named -V`
  2. 2. Determine which BIND 9 branch is in use (9.11.x, 9.18.x, 9.20.x, or 9.21.x)
  3. 3. Obtain the fixed version from ISC: for 9.18.x series upgrade to 9.18.51 or later, for 9.20.x upgrade to 9.20.25 or later, for 9.21.x upgrade to 9.21.24 or later
  4. 4. Download the appropriate patched release from downloads.isc.org or use your system's package manager
  5. 5. Stop the named service: `systemctl stop named` or `service named stop`
  6. 6. Install the new package using your system's package manager (e.g., `apt-get update && apt-get install bind9` or `yum update bind9`)
  7. 7. Verify the new version is installed: `named -v`
  8. 8. Start the named service: `systemctl start named` or `service named start`
Caveat Upgrading BIND may require configuration adjustments; review release notes for deprecations and ensure DNSSEC validation continues to work correctly after upgrade

Generated from the published advisory — verify against the referenced sources before acting.

No vendor fix exists The vendor has not published a patch for this.

There is no version to upgrade to and no patch to apply. Every affected install stays exposed until the vendor ships a fix — or somebody else builds one.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-13321 in production — separate from our analysis above.

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What this is

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What belongs here
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  • Version or environment caveats, and links to real fixes
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