Hitachi Dynamic Link Manager for Linux: UNIX Symbolic Link (Symlink) Following
CVE-2026-91762 is a high-severity UNIX symbolic link (symlink) following vulnerability in Hitachi Dynamic Link Manager for Linux from Hitachi, with a CVSS 3.1 base score of 7.9 out of 10. It can be exploited with local access to the system by an attacker with a low-privileged account, but only if a user takes part, for example by opening a link or file. The record lists version 9.0.5-00 as the first without the flaw, so updating Hitachi Dynamic Link Manager for Linux to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.12% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update Hitachi Dynamic Link Manager for Linux to 9.0.5-00 or a later version.
- Because the attack needs a user to take part, warn users about unexpected links and files related to this product until it is patched.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Hitachi | Hitachi Dynamic Link Manager for Linux | 8.5.3.-00 up to, but not including, 9.0.5-00 | 9.0.5-00 |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- LocalThe attacker needs local access or must trick a user into running something.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- LowA basic user account is enough.
- User interaction
- RequiredA user must take an action such as opening a file or link.
- Scope
- ChangedThe attack can reach beyond the vulnerable component into other systems.
- Confidentiality
- NoneNo data is disclosed.
- Integrity
- HighData or code can be modified at will.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:H. Scored by CNA (hitachi.co.jp).
Official description
UNIX Symbolic Link (Symlink) Following Vulnerability in Hitachi Dynamic Link Manager for Linux. This issue affects Hitachi Dynamic Link Manager for Linux: from 8.5.3.-00 before 9.0.5-00.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: UNIX Symbolic Link (Symlink) Following
The product, when opening a file or directory, does not sufficiently account for when the file is a symbolic link that resolves to a target outside of the intended control sphere. This could allow an attacker to cause the product to operate on unauthorized files.
How developers prevent this class of flaw
- Symbolic link attacks often occur when a program creates a tmp directory that stores files/links. Access to the directory should be restricted to the program as to prevent attackers from manipulating the files.
- Follow the principle of least privilege when assigning access rights to entities in a software system. Denying access to a file can prevent an attacker from replacing that file with a link to a sensitive file. Ensure good compartmentalization in the system to provide protected areas that can be trusted.
More UNIX Symbolic Link (Symlink) Following vulnerabilities (CWE-61)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: partial).
References
Other vulnerabilities in Hitachi Dynamic Link Manager for Linux
- 8.1 High severity
- 8.2 High severity
- 8.2 High severity
- 7.0 High severity
- 7.8 High severity
- 7.8 High severity
Recent UNIX Symbolic Link (Symlink) Following vulnerabilities
- 7.3 High severity
- 8.4 High severity
- 7.9 High severity
- 7.9 High severity
- 9.4 Critical severity
- 7.1 High severity
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