CVE-2026-1519 | ISC BIND up to 9.21.19 Zone unchecked input for loop condition

VDB-353130 · CVE-2026-1519 · GCVE-0-2026-1519 ISC BIND UP TO 9.21.19 ZONE UNCHECKED INPUT FOR LOOP CONDITION HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 6.3 $0-$5k 2.04+ Summaryinfo A vulnerability categorized as problematic has been discovered in ISC BIND up to 9.21.19. This affects an unknown function of the component Zone Handler. The manipulation results in unchecked input for loop condition. This vulnerability is known as CVE-2026-1519. It is possible to launch the attack remotely. No exploit is available. It is advisable to upgrade the affected component. Detailsinfo A vulnerability was found in ISC BIND up to 9.21.19. It has been classified as problematic. Affected is an unknown functionality of the component Zone Handler. The manipulation with an unknown input leads to a unchecked input for loop condition vulnerability. CWE is classifying the issue as CWE-606. The product does not properly check inputs that are used for loop conditions, potentially leading to a denial of service or other consequences because of excessive looping. This is going to have an impact on availability. CVE summarizes: If a BIND resolver is performing DNSSEC validation and encounters a maliciously crafted zone, the resolver may consume excessive CPU. Authoritative-only servers are generally unaffected, although there are circumstances where authoritative servers may make recursive queries (see: https://kb.isc.org/docs/why-does-my-authoritative-server-make-recursive-queries). This issue affects BIND 9 versions 9.11.0 through 9.16.50, 9.18.0 through 9.18.46, 9.20.0 through 9.20.20, 9.21.0 through 9.21.19, 9.11.3-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.46-S1, and 9.20.9-S1 through 9.20.20-S1. The advisory is available at kb.isc.org. This vulnerability is traded as CVE-2026-1519 since 01/28/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 03/25/2026). This vulnerability is assigned to T1449 by the MITRE ATT&CK project. Upgrading to version 9.18.47, 9.20.21 or 9.21.20 eliminates this vulnerability. Productinfo Type Domain Name Software Vendor ISC Name BIND Version 9.16.0 9.16.1 9.16.2 9.16.3 9.16.4 9.16.5 9.16.6 9.16.7 9.16.8 9.16.9 9.16.10 9.16.11 9.16.12 9.16.13 9.16.14 9.16.15 9.16.16 9.16.17 9.16.18 9.16.19 9.16.20 9.16.21 9.16.22 9.16.23 9.16.24 9.16.25 9.16.26 9.16.27 9.16.28 9.16.29 9.16.30 9.16.31 9.16.32 9.16.33 9.16.34 9.16.35 9.16.36 9.16.37 9.16.38 9.16.39 9.16.40 9.16.41 9.16.42 9.16.43 9.16.44 9.16.45 9.16.46 9.16.47 9.16.48 9.16.49 9.16.50 9.16.50-S1 9.18.0 9.18.1 9.18.2 9.18.3 9.18.4 9.18.5 9.18.6 9.18.7 9.18.8 9.18.9 9.18.10 9.18.11 9.18.12 9.18.13 9.18.14 9.18.15 9.18.16 9.18.17 9.18.18 9.18.19 9.18.20 9.18.21 9.18.22 9.18.23 9.18.24 9.18.25 9.18.26 9.18.27 9.18.28 9.18.29 9.18.30 9.18.31 9.18.32 9.18.33 9.18.34 9.18.35 9.18.36 9.18.37 9.18.38 9.18.39 9.18.40 9.18.41 9.18.42 9.18.43 9.18.44 9.18.45 9.18.46 9.18.46-S1 9.20.0 9.20.1 9.20.2 9.20.3 9.20.4 9.20.5 9.20.6 9.20.7 9.20.8 9.20.9 9.20.10 9.20.11 9.20.12 9.20.13 9.20.14 9.20.15 9.20.16 9.20.17 9.20.18 9.20.19 9.20.20 9.20.20-S1 9.21.0 9.21.1 9.21.2 9.21.3 9.21.4 9.21.5 9.21.6 9.21.7 9.21.8 9.21.9 9.21.10 9.21.11 9.21.12 9.21.13 9.21.14 9.21.15 9.21.16 9.21.17 9.21.18 9.21.19 License open-source Website Vendor: https://www.isc.org/ CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 6.4 VulDB Meta Temp Score: 6.3 VulDB Base Score: 5.3 VulDB Temp Score: 5.1 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 7.5 CNA Vector (isc): 🔒 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Unchecked input for loop condition CWE: CWE-606 / CWE-404 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: BIND 9.18.47/9.20.21/9.21.20 Timelineinfo 01/28/2026 CVE reserved 03/25/2026 +56 days Advisory disclosed 03/25/2026 +0 days VulDB entry created 03/25/2026 +0 days VulDB entry last update Sourcesinfo Vendor: isc.org Advisory: kb.isc.org Status: Confirmed CVE: CVE-2026-1519 (🔒) GCVE (CVE): GCVE-0-2026-1519 GCVE (VulDB): GCVE-100-353130 Entryinfo Created: 03/25/2026 15:19 Changes: 03/25/2026 15:19 (64) Complete: 🔍 Cache ID: 99:EBA:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸