CERT-In’s BIND weakness list is a map of different ways software can fail—not a claim that every listed flaw affects every BIND installation or causes every listed consequence. For administrators, the practical steps are to match the exact BIND edition and version to the affected range, read the ISC advisory for the specific vulnerability, and apply the update it identifies.
What CERT-In’s BIND weakness list means
CERT-In Vulnerability Note CIVN-2026-0467, issued September 21, 2026 and rated HIGH, covers multiple ISC BIND vulnerabilities. BIND provides authoritative and recursive DNS services. The note’s weakness list describes distinct failure mechanisms; the impact depends on the particular vulnerability and the system’s configuration.
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Some weaknesses involve memory or program execution, some concern validation and trust, and others can make a server spend disproportionate resources handling traffic. A weakness label alone does not establish that a deployment is remotely exploitable, exposed to a particular attack, or vulnerable to every consequence in the note.
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Memory and execution failures
- Use-after-free: Code may try to use memory after it has been released. Depending on the flaw, that can cause a crash or memory corruption.
- Memory not released after its effective lifetime: Data remains allocated after it is no longer needed. If the condition can be triggered repeatedly, memory use may grow.
- Null-pointer dereference: Code tries to access data through a null pointer, which can cause a failure such as a process crash.
- Reachable assertion: An input or execution path can reach an assertion intended to represent a condition that should not occur. If triggered, the program may terminate.
- Numeric truncation: A numeric value is reduced or represented with insufficient range or precision. Whether that creates a security problem depends on how the value is used.
Validation and trust-boundary failures
- Acceptance of extraneous untrusted data alongside trusted data: The software may accept additional data whose trustworthiness has not been established together with trusted data.
- Origin-validation error: A check intended to establish where data came from may be incorrect.
- Insufficient verification of data authenticity: The software may not adequately establish that data is authentic. The implications depend on the affected data and the specific vulnerability.
Resource-consumption failures
- Excessive platform resource consumption within a loop: A repeated operation may consume too much of a system resource.
- Asymmetric resource consumption (amplification): Handling an input may require substantially more resources than sending it. The resource could involve bandwidth, memory, or processing, depending on the issue.
- Inefficient algorithmic complexity: Processing cost may grow inefficiently as input size or quantity increases, potentially allowing crafted traffic to consume excessive resources.
What outcomes could an affected flaw cause?
CIVN-2026-0467 describes possible denial of service, bypass of security restrictions, spoofing or cache-poisoning attacks, and unauthorized additions of DNS-zone data. These are possible outcomes across the vulnerabilities covered by the note, not consequences that follow from every weakness entry. Which outcome applies depends on the specific vulnerability, its prerequisites, and the installation’s configuration.
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For an operator, the distinction matters: a weakness category explains the kind of defect; the individual ISC advisory explains how a particular vulnerability can be triggered, what systems or configurations are in scope, and what impact is documented. Do not infer exposure or safety from a category name alone.
Is your BIND version affected?
CERT-In lists these affected BIND ranges in CIVN-2026-0467:
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| BIND branch | Affected versions listed |
|---|---|
| 9.11 | 9.11.0–9.18.50 |
| 9.20 | 9.20.0–9.20.27 |
| 9.21 | 9.21.0–9.21.25 |
| Supported Preview Edition | Specific ranges are listed in the note; check the note and relevant ISC advisory for the exact range. |
Read the ranges as branch- and edition-specific, not as one continuous range applying to every release. Identify the exact installed edition and version, then compare it with the range and the individual vulnerability’s scope in the ISC advisory. A version string outside one listed branch range does not by itself resolve whether another edition or branch is affected.
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How to respond to a BIND vulnerability
- Identify the installation. Record the exact BIND edition and version running on each relevant DNS server.
- Match the issue. Use CIVN-2026-0467 to identify the vulnerability, then consult the corresponding ISC advisory for the branch, affected configuration, and documented impact.
- Apply the vendor update. Follow the update guidance for that specific advisory and edition. CERT-In links to ISC advisories and the BIND 9.21.26 changelog, but the note’s multiple branches and preview editions mean there is no single universal target version established here.
- Verify service health. After updating, confirm that the intended version is running and that authoritative and recursive DNS service behavior is normal for your deployment.
ISC’s security-advisory index is the starting point for finding the detailed vendor guidance. Use the relevant advisory as the authority for the fixed release and any configuration-specific workaround; CERT-In’s note is an alert and summary.
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Why older CERT-In notes are not a workaround guide for this alert
Earlier notes show that BIND resource and memory issues have appeared in different forms, but their mitigations are not automatically transferable to the 2026 vulnerabilities.
- CIVN-2026-0270, May 27, 2026: Describes use-after-free, disproportionate bandwidth consumption, denial of service, unauthorized access, memory corruption, and undefined behavior, and links five ISC CVE advisories.
- CIVN-2025-0015, February 7, 2025: Describes specially crafted requests that can cause CPU exhaustion and denial of service. It lists
minimal-responses yes;and disabling DNS-over-HTTPS as workarounds for the vulnerabilities covered by that note only. - CIVN-2024-0053, February 20, 2024: Records prior CPU-exhaustion and out-of-memory conditions, including DNSSEC verification complexity and a DNS64/serve-stale query-handling case.
Use a workaround only when the advisory for the vulnerability at hand recommends it. The existence of a workaround in an older note does not establish that it applies to CIVN-2026-0467 or substitutes for a vendor update.
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