CWE-30 (路径遍历：’dirfilename’) — Vulnerability Class 1

1 vulnerabilities classified as CWE-30 (路径遍历：’dirfilename’). AI Chinese analysis included.

MITRE CWE Description

The product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize '\dir\..\filename' (leading backslash dot dot) sequences that can resolve to a location that is outside of that directory. This allows attackers to traverse the file system to access files or directories that are outside of the restricted directory. This is similar to CWE-26, except using "\" instead of "/". The '\dir\..\filename' manipulation is useful for bypassing some path traversal protection schemes. Sometimes a program only checks for "..\" at the beginning of the input, so a "\..\" can bypass that check.

Common Consequences (1)

Confidentiality, Integrity Read Files or Directories, Modify Files or Directories

Mitigations (2)

Implementation Assume all input is malicious. Use an "accept known good" input validation strategy, i.e., use a list of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does. When performing input validation, consider all potentially relevant properties, including length, type of input, the full range…

Implementation Inputs should be decoded and canonicalized to the application's current internal representation before being validated (CWE-180). Make sure that the application does not decode the same input twice (CWE-174). Such errors could be used to bypass allowlist validation schemes by introducing dangerous inputs after they have been checked.

CVE ID	Title	CVSS	Severity	Published
CVE-2026-79824	HPE NonStop Python 3.x - Directory traversal vulnerability — HPE NonStop Python 3.x	8.0	High	2026-10-15

Vulnerabilities classified as CWE-30 (路径遍历：’dirfilename’) represent 1 CVEs. The CWE taxonomy describes the weakness; review individual CVEs for product-specific impact.