CWE-30
Weakness AllowedPath Traversal: '\dir\..\filename'
Abstraction: Variant · Status: Draft
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.
Technical nuance
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.
Mapping guidance
This CWE entry is at the Variant level of abstraction, which is a preferred level of abstraction for mapping to the root causes of vulnerabilities.
Carefully read both the name and description to ensure that this mapping is an appropriate fit. Do not try to 'force' a mapping to a lower-level Base/Variant simply to comply with this preferred level of abstraction.
Modes of introduction
Detection methods
Automated Static Analysis
Automated static analysis, commonly referred to as Static Application Security Testing (SAST), can find some instances of this weakness by analyzing source code (or binary/compiled code) without having to execute it. Typically, this is done by building a model of data flow and control flow, then searching for potentially-vulnerable patterns that connect "sources" (origins of input) with "sinks" (destinations where the data interacts with external components, a lower layer such as the OS, etc.)
Content history
updated Potential_Mitigations, Time_of_Introduction
updated Relationships, Taxonomy_Mappings
updated Applicable_Platforms, Description
updated Observed_Examples
updated Potential_Mitigations
updated Description, Potential_Mitigations
updated Potential_Mitigations
updated Common_Consequences
updated Relationships
updated Relationships, Taxonomy_Mappings
updated Applicable_Platforms
updated Potential_Mitigations, Relationships
updated Potential_Mitigations
updated Description
updated Relationships
updated Mapping_Notes
updated Affected_Resources, Functional_Areas
updated Detection_Factors, Weakness_Ordinalities
updated Common_Consequences, Description, Technical_Nuance
4 vulnerabilities reference this CWE, most recent first.
CVE-2026-79824 (GCVE-0-2026-79824)
Vulnerability from cvelistv5 – Published: 2026-10-15 09:09 – Updated: 2026-10-15 14:14- CWE-30 - Path traversal: '\dir\..\filename'
| Vendor | Product | Version | |
|---|---|---|---|
| Hewlett Packard Enterprise | HPE NonStop Python 3.x |
Affected:
T0993L01^AAL and earlier
|
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CVE-2025-54386 (GCVE-0-2025-54386)
Vulnerability from cvelistv5 – Published: 2025-08-01 23:32 – Updated: 2025-08-04 15:28| URL | Tags |
|---|---|
| https://github.com/traefik/traefik/security/advis… | x_refsource_CONFIRM |
| https://github.com/traefik/plugin-service/pull/71 | x_refsource_MISC |
| https://github.com/traefik/plugin-service/pull/72 | x_refsource_MISC |
| https://github.com/traefik/traefik/pull/11911 | x_refsource_MISC |
| https://github.com/traefik/traefik/commit/5ef853a… | x_refsource_MISC |
| https://github.com/traefik/traefik/releases/tag/v… | x_refsource_MISC |
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GHSA-HQ9Q-PMXP-59XM
Vulnerability from github – Published: 2026-10-15 12:31 – Updated: 2026-10-15 12:31A directory traversal vulnerability in HPE NonStop Python 3.x could allow attackers to overwrite arbitrary files via a .. (dot dot) sequence in filenames in a TAR archive.
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GHSA-Q6GG-9F92-R9WG
Vulnerability from github – Published: 2025-08-01 18:08 – Updated: 2025-11-27 09:02Summary
A path traversal vulnerability was discovered in WASM Traefik’s plugin installation mechanism. By supplying a maliciously crafted ZIP archive containing file paths with ../ sequences, an attacker can overwrite arbitrary files on the system outside of the intended plugin directory. This can lead to remote code execution (RCE), privilege escalation, persistence, or denial of service.
✅ After investigation, it is confirmed that no plugins on the Catalog were affected. There is no known impact.
Details
The vulnerability resides in the WASM plugin extraction logic, specifically in the unzipFile function (/plugins/client.go). The application constructs file paths during ZIP extraction using filepath.Join(destDir, f.Name) without validating or sanitizing f.Name. If the ZIP archive contains entries with ../, the resulting path can escape the intended directory, allowing writes to arbitrary locations on the host filesystem.
Attack Requirements
There are several requirements needed to make this attack possible: - The Traefik server should be deployed with plugins enabled with a WASM plugin (yaegi plugins are not impacted). - The attacker should have write access to a remote plugin asset loaded by the Traefik server - The attacker should craft a malicious version of this plugin
Warning
As clearly stated in the documentation, plugins are experimental in Traefik, and unsafe plugins could damage your infrastructure:
Experimental Features Plugins can change the behavior of Traefik in unforeseen ways. Exercise caution when adding new plugins to production Traefik instances.
Impact
This vulnerability did not affect any plugin from the catalog. There is no known impact.
Additionally, the catalog will also prevent any compromised plugin to be available across all Traefik versions.
This vulnerability can allow an attacker to perform arbitrary file write outside the intended plugin extraction directory by crafting a malicious ZIP archive that includes ../ (directory traversal) in file paths.
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"details": "### Summary\nA path traversal vulnerability was discovered in WASM Traefik\u2019s plugin installation mechanism. By supplying a maliciously crafted ZIP archive containing file paths with `../` sequences, an attacker can overwrite arbitrary files on the system outside of the intended plugin directory. This can lead to remote code execution (RCE), privilege escalation, persistence, or denial of service.\n **\u2705 After investigation, it is confirmed that no plugins on the [Catalog](https://plugins.traefik.io/plugins) were affected. There is no known impact.**\n\n### Details\nThe vulnerability resides in the WASM plugin extraction logic, specifically in the `unzipFile` function (`/plugins/client.go`). The application constructs file paths during ZIP extraction using `filepath.Join(destDir, f.Name)` without validating or sanitizing `f.Name`. If the ZIP archive contains entries with `../`, the resulting path can escape the intended directory, allowing writes to arbitrary locations on the host filesystem.\n\n### Attack Requirements\nThere are several requirements needed to make this attack possible:\n- The Traefik server should be deployed with [plugins enabled](https://doc.traefik.io/traefik/plugins/) with a WASM plugin (yaegi plugins are not impacted).\n- The attacker should have write access to a remote plugin asset loaded by the Traefik server\n- The attacker should craft a malicious version of this plugin\n\n### Warning\nAs clearly stated in the [documentation](https://doc.traefik.io/traefik/plugins/), plugins are experimental in Traefik, and unsafe plugins could damage your infrastructure:\n\n\u003e **Experimental Features**\nPlugins can change the behavior of Traefik in unforeseen ways. Exercise caution when adding new plugins to production Traefik instances.\n\n### Impact\n**This vulnerability did not affect any plugin from the catalog. There is no known impact. \nAdditionally, the catalog will also prevent any compromised plugin to be available across all Traefik versions.**\nThis vulnerability can allow an attacker to perform arbitrary file write outside the intended plugin extraction directory by crafting a malicious ZIP archive that includes `../` (directory traversal) in file paths.",
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"modified": "2025-11-27T09:02:51Z",
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Mitigation MIT-5.1
Strategy: Input Validation
- 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 of acceptable values, missing or extra inputs, syntax, consistency across related fields, and conformance to business rules. As an example of business rule logic, "boat" may be syntactically valid because it only contains alphanumeric characters, but it is not valid if the input is only expected to contain colors such as "red" or "blue."
- Do not rely exclusively on looking for malicious or malformed inputs. This is likely to miss at least one undesirable input, especially if the code's environment changes. This can give attackers enough room to bypass the intended validation. However, denylists can be useful for detecting potential attacks or determining which inputs are so malformed that they should be rejected outright.
- When validating filenames, use stringent allowlists that limit the character set to be used. If feasible, only allow a single "." character in the filename to avoid weaknesses such as CWE-23, and exclude directory separators such as "/" to avoid CWE-36. Use a list of allowable file extensions, which will help to avoid CWE-434.
- Do not rely exclusively on a filtering mechanism that removes potentially dangerous characters. This is equivalent to a denylist, which may be incomplete (CWE-184). For example, filtering "/" is insufficient protection if the filesystem also supports the use of "\" as a directory separator. Another possible error could occur when the filtering is applied in a way that still produces dangerous data (CWE-182). For example, if "../" sequences are removed from the ".../...//" string in a sequential fashion, two instances of "../" would be removed from the original string, but the remaining characters would still form the "../" string.
Mitigation MIT-20
Strategy: Input Validation
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.
No CAPEC attack patterns related to this CWE.