CVE-2021-39208

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    CVE-2021-39208

    Published: 16 Sept 2021Last Modified: 9 Jul 2026

    Summary:

    Details: SharpCompress is a fully managed C# library to deal with many compression types and formats. Versions prior to 0.29.0 are vulnerable to partial path traversal. SharpCompress recreates a hierarchy of directories under destinationDirectory if ExtractFullPath is set to true in options. In order to prevent extraction outside the destination directory the destinationFileName path is verified to begin with fullDestinationDirectoryPath. However, prior to version 0.29.0, it is not enforced that fullDestinationDirectoryPath ends with slash. If the destinationDirectory is not slash terminated like `/home/user/dir` it is possible to create a file with a name thats begins as the destination directory one level up from the directory, i.e. `/home/user/dir.sh`. Because of the file name and destination directory constraints the arbitrary file creation impact is limited and depends on the use case. This issue is fixed in SharpCompress version 0.29.0.

    References: https://github.com/adamhathcock/sharpcompress/releases/tag/0.29.0, https://github.com/adamhathcock/sharpcompress/pull/614, https://github.com/adamhathcock/sharpcompress/security/advisories/GHSA-jp7f-grcv-6mjf

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -ea5c8dc06314c7a5068e7901c51a625224d2b288

    Affected versions

    0.28.3
    0.28.2
    0.28.1
    0.28

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2021-39208 | CVE-DB