A DNSSEC validating resolver that is under a random subdomain attack against a DNSSEC-signed zone can suffer from runaway memory usage. The attacker needs to be able to send queries faster than the resolver can perform validation. The increased memory usage can be orders of magnitude beyond the limit configured in the `max-cache-size` parameter. 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.

debian_linux dla-4725: Debian dla-4725 : bind9 - security update

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:3554-1 advisory.

    - CVE-2026-10723: incorrect acceptance of NSEC3 records (bsc#1271982).
    - CVE-2026-11331: potential wildcard CNAME RPZ policy bypass (bsc#1271984).
    - CVE-2026-11622: potential memory usage beyond configured limits (bsc#1271986).
    - CVE-2026-11721: cache poisoning possible with label count discrepancy, RRSIG, and wildcards     (bsc#1271987).
    - CVE-2026-13204: unexpected exit in certain situations with NSEC and NSEC3 both present (bsc#1271989).
    - CVE-2026-13321: DNSSEC validation bypass via out-of-zone NSEC Next field (bsc#1271990).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES12 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:3484-1 advisory.

    This update for bind fixes the following issues

    - CVE-2026-11622: Potential memory usage beyond configured limits (bsc#1271986).
    - CVE-2026-11721: Cache poisoning possible with label count discrepancy, RRSIG, and wildcards     (bsc#1271987).
    - CVE-2026-13204: Unexpected exit in certain situations with NSEC and NSEC3 both present (bsc#1271989).
    - CVE-2026-13321: DNSSEC Validation Bypass via Out-of-Zone NSEC Next Field (bsc#1271990).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:3477-1 advisory.

    This update for bind fixes the following issues

    - CVE-2026-10723: Incorrect acceptance of NSEC3 records (bsc#1271982).
    - CVE-2026-11331: Potential wildcard CNAME RPZ policy bypass (bsc#1271984).
    - CVE-2026-11622: Potential memory usage beyond configured limits (bsc#1271986).
    - CVE-2026-11721: Cache poisoning possible with label count discrepancy, RRSIG, and wildcards     (bsc#1271987).
    - CVE-2026-13204: Unexpected exit in certain situations with NSEC and NSEC3 both present (bsc#1271989).
    - CVE-2026-13321: DNSSEC Validation Bypass via Out-of-Zone NSEC Next Field (bsc#1271990).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:3476-1 advisory.

    This update for bind fixes the following issues

    - CVE-2026-10723: Incorrect acceptance of NSEC3 records (bsc#1271982).
    - CVE-2026-11331: Potential wildcard CNAME RPZ policy bypass (bsc#1271984).
    - CVE-2026-11622: Potential memory usage beyond configured limits (bsc#1271986).
    - CVE-2026-11721: Cache poisoning possible with label count discrepancy, RRSIG, and wildcards     (bsc#1271987).
    - CVE-2026-13204: Unexpected exit in certain situations with NSEC and NSEC3 both present (bsc#1271989).
    - CVE-2026-13321: DNSSEC Validation Bypass via Out-of-Zone NSEC Next Field (bsc#1271990).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-2040 advisory.

    BIND may accept incorrect child-zone NSEC3 records as valid, which could allow an attacker to forge     authenticated NXDOMAIN responses.This issue affects BIND 9 versions 9.18.0 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.
    (CVE-2026-10723)

    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 text, it will use the invalid length during processing, leading to a consistency check failing.This     issue affects BIND 9 versions 9.18.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23,     9.18.11-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1. (CVE-2026-10822)

    An attacker who knows (or guesses) that a resolver uses RPZ with wildcard CNAME policies can craft query     names long enough to trigger a NAMETOOLONG error condition during RPZ processing. This is not handled     correctly and may lead to defeating the RPZ rule. It also may lead to an unexpected exit of the BIND 9     software.This issue affects BIND 9 versions 9.16.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through     9.21.23, 9.16.8-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1. (CVE-2026-11331)

    A DNSSEC validating resolver that is under a random subdomain attack against a DNSSEC-signed zone can     suffer from runaway memory usage. The attacker needs to be able to send queries faster than the resolver     can perform validation. The increased memory usage can be orders of magnitude beyond the limit configured     in the `max-cache-size` parameter.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.
    (CVE-2026-11622)

    It is possible for an attacker's zone to respond to a query with an RRSIG that has a smaller number of     labels than the zone in which the RRSIG is contained. This causes `named` to produce a wildcard name for a     zone that is shorter than the attacker's zone, which can result in cache poisoning. For this attack to     have any effect, the resolver under attack must have set `synth-from-dnssec yes;` (which is the     default).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. (CVE-2026-11721)

    The issue is unexpected program termination based on ordering and/or specific content in responses to     queries for CNAME or DNAME, and A records. Specifically, if a client queries for a DNAME and A record     below the DNAME to the resolver, and the authoritative server responds positively to the A query but     delays the DNAME response and later responds negatively, `named` may quit unexpectedly. Or, if a client     queries for a CNAME and A record for the same name to the resolver, and the authoritative server responds     positively to the A query but delays the CNAME response and later responds with a self-referential CNAME,     the same failure may occur.This issue affects BIND 9 versions 9.18.0 through 9.18.50, 9.20.0 through     9.20.24, 9.18.11-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1. (CVE-2026-12617)

    If a provably insecure domain is covered by both an NSEC and NSEC3 record at the parent, and there exist     an RRSIG for only one of these types, then BIND may exit unexpectedly with an assertion while validating     this proof.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. (CVE-2026-13204)

    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. (CVE-2026-13321)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of bind installed on the remote host is prior to 9.11.4-26.P2. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2026-3854 advisory.

    BIND may accept incorrect child-zone NSEC3 records as valid, which could allow an attacker to forge     authenticated NXDOMAIN responses.This issue affects BIND 9 versions 9.18.0 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.
    (CVE-2026-10723)

    A DNSSEC validating resolver that is under a random subdomain attack against a DNSSEC-signed zone can     suffer from runaway memory usage. The attacker needs to be able to send queries faster than the resolver     can perform validation. The increased memory usage can be orders of magnitude beyond the limit configured     in the `max-cache-size` parameter.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.
    (CVE-2026-11622)

    It is possible for an attacker's zone to respond to a query with an RRSIG that has a smaller number of     labels than the zone in which the RRSIG is contained. This causes `named` to produce a wildcard name for a     zone that is shorter than the attacker's zone, which can result in cache poisoning. For this attack to     have any effect, the resolver under attack must have set `synth-from-dnssec yes;` (which is the     default).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. (CVE-2026-11721)

    If a provably insecure domain is covered by both an NSEC and NSEC3 record at the parent, and there exist     an RRSIG for only one of these types, then BIND may exit unexpectedly with an assertion while validating     this proof.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. (CVE-2026-13204)

    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. (CVE-2026-13321)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:3452-1 advisory.

    - CVE-2026-10723: accepting incorrect child-zone NSEC3 records as valid can allow an attacker to forge     authenticated       NXDOMAIN responses for sibling zones (bsc#1271982).
    - CVE-2026-10822: storing a DNS key record with an invalid PRIVATEDNS algorithm identifier length can     trigger a       consistency check failure (bsc#1271983).
    - CVE-2026-11331: handling NAMETOOLONG error conditions incorrectly during RPZ wildcard CNAME processing     can allow       bypassing RPZ rules or triggering process exits (bsc#1271984).
    - CVE-2026-11622: DNSSEC validating resolver under a random subdomain attack can suffer from runaway     memory usage       exceeding max-cache-size and affecting response rate (bsc#1271986).
    - CVE-2026-11721: RRSIG with fewer labels than its containing zone when synth-from-dnssec is enabled can     lead to       wildcard generation (bsc#1271987).
    - CVE-2026-12617: delayed or specific CNAME/DNAME query responses combined with positive A record     responses can trigger       an assertion failure (bsc#1271988).
    - CVE-2026-13204: validating a domain covered by both NSEC and NSEC3 with an RRSIG for only one type can     trigger an       assertion failure (bsc#1271989).
    - CVE-2026-13321: NSEC records with a `Next Domain Name` pointing outside the signer's zone can allow     cross-zone cache       poisoning and authenticated denial-of-service responses (bsc#1271990).

    - Update to release 9.18.50:

     * Remove ineffective TCP fallback after repeated UDP timeouts.
     * Fall back to TCP on receipt of a UDP response with a mismatched query ID.
     * Fix DNS64 owner case after DNAME restart.
     * Clear REDIRECT flag when it isn't needed.

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote openSUSE 16 host has packages installed that are affected by multiple vulnerabilities as referenced in the openSUSE-SU-2026:21489-1 advisory.

    This update for bind fixes the following issues

    - Upgrade to release 9.20.26
    - CVE-2026-10723: Incorrect acceptance of NSEC3 records (bsc#1271982).
    - CVE-2026-10822: Key Record using PRIVATEDNS algorithm may lead to unexpected exit (bsc#1271983).
    - CVE-2026-11331: Potential wildcard CNAME RPZ policy bypass (bsc#1271984).
    - CVE-2026-11605: Unnecessary validation of DNSSEC signed records (bsc#1271985).
    - CVE-2026-11622: Potential memory usage beyond configured limits (bsc#1271986).
    - CVE-2026-11721: Cache poisoning possible with label count discrepancy, RRSIG, and wildcards     (bsc#1271987).
    - CVE-2026-12617: Record ordering based unexpected exit with CNAME or DNAME (bsc#1271988).
    - CVE-2026-13204: Unexpected exit in certain situations with NSEC and NSEC3 both present (bsc#1271989).
    - CVE-2026-13321: DNSSEC Validation Bypass via Out-of-Zone NSEC Next Field (bsc#1271990).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:3426-1 advisory.

    Upgrade to release 9.20.26.

    Security issues fixed:

    - CVE-2026-10723: incorrect acceptance of NSEC3 records (bsc#1271982).
    - CVE-2026-10822: key record using PRIVATEDNS algorithm may lead to unexpected exit (bsc#1271983).
    - CVE-2026-11331: potential wildcard CNAME RPZ policy bypass (bsc#1271984).
    - CVE-2026-11605: unnecessary validation of DNSSEC signed records (bsc#1271985).
    - CVE-2026-11622: potential memory usage beyond configured limits (bsc#1271986).
    - CVE-2026-11721: cache poisoning possible with label count discrepancy, RRSIG, and wildcards     (bsc#1271987).
    - CVE-2026-12617: record ordering based unexpected exit with CNAME or DNAME (bsc#1271988).
    - CVE-2026-13204: unexpected exit in certain situations with NSEC and NSEC3 both present (bsc#1271989).
    - CVE-2026-13321: DNSSEC validation bypass via out-of-zone NSEC Next field (bsc#1271990).

    Other updates and bugfixes:

    - Release 9.20.26:
      * Reclaim memory promptly when DNSSEC validations are canceled.
      * Removed Features:
        * Remove the secondary validator in query.c.
        * Remove ineffective TCP fallback after repeated UDP timeouts.
      * Feature Changes:
        * Fall back to TCP on receipt of a UDP response with a mismatched           query ID.
        * Limit the number of glue records cached from a referral.
        * Fix a resolver stall on a CNAME response to a DS query.
      * Bug Fixes:
        * Fix a bug in DNS UPDATE processing with inline-signing enabled.
        * Properly detect private records before copying.
        * Tighten referral DS acceptance.
        * Don't synthesize negative responses with pending NSEC.
        * Check that an NSEC signer is at or above the name to be           validated.
        * Don't evict DNSSEC-validated cache data on a CD=1 NXDOMAIN.
        * Fix a deny-answer-aliases configuration bypass issue.
        * Reject external referrals from forwarders.
        * Fix a zone transfer over TLS (XoT) issue when using the           opportunistic TLS mode.
        * Unvalidated opt-out NSEC3 could be accepted in insecurity           proof.
        * Check wildcard signer and NOQNAME signer match.
        * Fix CNAME resolution failure caused by a cached SERVFAIL           response.
        * Reject unsupported RSA DNSKEY shapes during DNSSEC validation.
        * Fix a bug in GeoIP2 string matching.
        * Fix DNS-over-HTTPS (DoH) quota configuration issue.
        * Truncated reply to a TSIG query no longer stalls the resolver.
        * Ignore updates removing DNSKEY RRset with class ANY.
        * Ignore 0-byte reads in the TCP read callback.
        * Only print per-zone glue stats when zone-statistics is set to           full.
        * CDS/CDNSKEY records were not removed when re-configuring the           server.
        * Fix a crash when querying an empty non-terminal in a wildcard           zone in RBTDB.
        * Stop reusing outgoing TCP connections the peer has already           closed.
        * Fix DNSSEC validation failures for names under an apex DNAME.
          * The resolver now removes other RRsets at the same name when             caching a CNAME.
        * Fix nxdomain-redirect combined with dns64.
        * Fix DNS64 owner case after DNAME restart.
        * Clear REDIRECT flag when it isn't needed.
        * Disable output escaping in bind9.xsl.
        * Fix crash on badly configured secondary signer.
        * Fix a possible crash on concurrent TKEY DELETE for the same           key.
        * Reject RRSIG records covering meta-types.

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - A DNSSEC validating resolver that is under a random subdomain attack against a DNSSEC-signed zone can     suffer from runaway memory usage. The attacker needs to be able to send queries faster than the resolver     can perform validation. The increased memory usage can be orders of magnitude beyond the limit configured     in the `max-cache-size` parameter. 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.
    (CVE-2026-11622)

Note that Nessus relies on the presence of the package as reported by the vendor.

The remote Debian 13 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-6395 advisory.

    - -------------------------------------------------------------------------     Debian Security Advisory DSA-6395-1                   security@debian.org     https://www.debian.org/security/                     Salvatore Bonaccorso     July 22, 2026                         https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : bind9     CVE ID         : CVE-2026-10723 CVE-2026-10822 CVE-2026-11331 CVE-2026-11605                      CVE-2026-11622 CVE-2026-11721 CVE-2026-12617 CVE-2026-13204                      CVE-2026-13321

    Several vulnerabilities were discovered in BIND, a DNS server     implementation, which may result in bypass of DNSSEC validation, RPZ     policy bypass, cache poisoning or denial of service.

    For the stable distribution (trixie), these problems have been fixed in     version 1:9.20.26-1~deb13u1.

    We recommend that you upgrade your bind9 packages.

    For the detailed security status of bind9 please refer to its security     tracker page at:
    https://security-tracker.debian.org/tracker/bind9

    Further information about Debian Security Advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://www.debian.org/security/

    Mailing list: debian-security-announce@lists.debian.org

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Type	Severity
334717	SUSE SLED15 / SLES15 Security Update : bind (SUSE-SU-2026:3554-1)	Nessus	SuSE Local Security Checks	Local	high
332138	SUSE SLES12: bind / bind-chrootenv / bind-devel / bind-doc / bind-utils / etc (SUSE-SU-2026:3484-1)	Nessus	SuSE Local Security Checks	Local	high
332129	SUSE SLES15 Security Update : bind (SUSE-SU-2026:3477-1)	Nessus	SuSE Local Security Checks	Local	high
332127	SUSE SLES15 Security Update : bind (SUSE-SU-2026:3476-1)	Nessus	SuSE Local Security Checks	Local	high
332053	Amazon Linux 2023 : bind, bind-chroot, bind-devel (ALAS2023-2026-2040)	Nessus	Amazon Linux Local Security Checks	Local	high
332027	Amazon Linux 2 : bind, --advisory ALAS2-2026-3854 (ALAS-2026-3854)	Nessus	Amazon Linux Local Security Checks	Local	high
331849	SUSE SLES15 Security Update : bind (SUSE-SU-2026:3452-1)	Nessus	SuSE Local Security Checks	Local	high
331566	openSUSE 16: bind / bind-modules-bdbhpt / bind-modules-generic / etc (openSUSE-SU-2026:21489-1)	Nessus	SuSE Local Security Checks	Local	high
331433	SUSE SLED15 / SLES15 Security Update : bind (SUSE-SU-2026:3426-1)	Nessus	SuSE Local Security Checks	Local	high
329478	Linux Distros Unpatched Vulnerability : CVE-2026-11622	Nessus	Misc.	Local	high
329075	Debian dsa-6395 : bind9 - security update	Nessus	Debian Local Security Checks	Local	high

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