The product filters data in a way that causes it to be reduced or "collapsed" into an unsafe value that violates an expected security property.
View on MITRECanonicalize the name to match that of the file system's representation of the name. This can sometimes be achieved with an available API (e.g. in Win32 the GetFullPathName function).
No detection method information available for this CWE.
"/.//..//////././" is collapsed into "/.././" after ".." and "//" sequences are removed.
View Detailschain: HTTP server protects against ".." but allows "." variants such as "////./../.../". If the server removes "/.." sequences, the result would collapse into an unsafe value "////../" (CWE-182).
View DetailsMFV. Regular expression intended to protect against directory traversal reduces ".../...//" to "../".
View DetailsXSS protection mechanism strips a <script> sequence that is nested in another <script> sequence.
View DetailsNo relationship information available for this CWE.
CWE-182: Collapse of Data into Unsafe Value is a Common Weakness Enumeration (CWE) entry maintained by MITRE. The product filters data in a way that causes it to be reduced or "collapsed" into an unsafe value that violates an expected security property.
If exploited, CWE-182 (Collapse of Data into Unsafe Value) it can compromise Access Control, leading to outcomes such as Bypass Protection Mechanism.
Recommended mitigations for CWE-182 include: Canonicalize the name to match that of the file system's representation of the name. This can sometimes be achieved with an available API (e.g. in Win32 the GetFullPathName function).
CWE-182 commonly affects Not Language-Specific. Note that weaknesses are often language-agnostic patterns, so secure coding practices apply broadly.
MITRE documents real CVEs mapped to CWE-182, including CVE-2004-0815, CVE-2005-3123, CVE-2002-0325, CVE-2002-0784 and CVE-2005-2169. You can look up the full details of each CVE, including CVSS scores and remediation guidance, on our CVE Lookup tool.
A CWE (Common Weakness Enumeration) like CWE-182 describes a category of software weakness — the underlying flaw type. A CVE (Common Vulnerabilities and Exposures) identifies a specific, real-world vulnerability in a particular product. In short, a CWE is the kind of mistake, and a CVE is an instance of that mistake being found in software.