CVE-2026-10822: If BIND encounters a particular invalid data structure in a DNS record, it will accept the invalid data, and m

Routine

MEDIUM 6.5UPGRADE

CVE-2026-10822 is a medium-severity flaw (CVSS 6.5) affecting bind. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

If BIND encounters a particular invalid data structure in a DNS record, it will accept the invalid data, and may subsequently abort and exit. BIND will first need to store a DNS record for a key (KEY, DNSKEY, etc.). That key must specify a PRIVATEDNS algorithm (253), and in the algorithm identifier, improperly give a length longer than the actual identifier data. The invalid identifier will be stored. If BIND later needs to render that record to

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	None
User interaction	Required
EPSS exploit chance	0.4% (top 68%)
CISA exploited list	No
Weakness	CWE-617, CWE-1284
Published	2026-07-22
Last modified	2026-11-02

Publisher (CNA): Internet Systems Consortium (ISC) · Vendor: isc

Last updated 2026-11-02 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-22 15:16 UTCPublished CVE record published
2026-11-02 17:46 UTCUpdated Record last modified

isc bind UPGRADE

Affected: >= 9.18.0 and <= 9.18.50 · >= 9.18.11 and <= 9.18.50 · >= 9.20.0 and <= 9.20.24 · >= 9.20.9 and <= 9.20.24 · >= 9.21.0 and <= 9.21.23

Fixed in: newer than 9.21.23

Safe to downgrade to: a release before 9.18.0

1. Check installed version

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

2. UPGRADE to newer than 9.21.23 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade bind

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 9.18.0 (Debian / Ubuntu)

apt-cache madison bind sudo apt install bind=<VERSION_BEFORE_9.18.0> sudo apt-mark hold bind

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

dnf --showduplicates list bind sudo dnf downgrade bind-<VERSION_BEFORE_9.18.0> sudo dnf versionlock add bind

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-2026-10822?

bind: upgrade to newer than 9.21.23. Exact commands for each OS are on this page.

Is CVE-2026-10822 being exploited?

CVE-2026-10822 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-2026-10822 affect?

CVE-2026-10822 affects bind. Severity is medium (CVSS 6.5). If BIND encounters a particular invalid data structure in a DNS record, it will accept the invalid data, and may subsequently abort and exit. BIND will first need to store a DNS record for a key (KEY, DNSKEY, etc.). That key must specify a

How urgent is CVE-2026-10822?

Priority 31/100. No elevated risk signals yet.

Software pages

BIND DNS vulnerabilities

Related CVEs

CVE-2026-13321 HIGH 8.6 UPGRADE The BIND resolver accepts validly-signed NSEC records where the "Next Domain Name" field points outside the si
CVE-2026-13204 HIGH 7.5 UPGRADE If a provably insecure domain is covered by both an NSEC and NSEC3 record at the parent, and there exist an RR
CVE-2026-10723 MEDIUM 6.8 UPGRADE BIND may accept incorrect child-zone NSEC3 records as valid, which could allow an attacker to forge authentica
CVE-2026-11331 HIGH 7.5 UPGRADE An attacker who knows (or guesses) that a resolver uses RPZ with wildcard CNAME policies can craft query names
CVE-2026-11605 HIGH 7.5 UPGRADE The issue is a resource exhaustion vulnerability associated with DNSSEC validation

References

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