adamhathcock sharpcompress up to 0.47.4 IArchive.WriteToDirectory path traversal

Summaryinfo

A vulnerability has been found in adamhathcock sharpcompress up to 0.47.4 and classified as critical. Impacted is the function IArchive.WriteToDirectory. Performing a manipulation results in path traversal. This vulnerability is known as CVE-2026-44788. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability was found in adamhathcock sharpcompress up to 0.47.4. It has been classified as critical. This affects the function IArchive.WriteToDirectory. The manipulation with an unknown input leads to a path traversal vulnerability. CWE is classifying the issue as CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. This is going to have an impact on integrity, and availability. The summary by CVE is:

SharpCompress is a fully managed C# library to deal with many compression types and formats. In 0.47.4 and earlier, a path traversal vulnerability in IArchive.WriteToDirectory() allows a malicious archive to create directories outside the intended extraction root. For TAR archives, this can be escalated to arbitrary file writes by chaining with a symlink entry, giving a full write primitive on the target filesystem subject to the permissions of the running process.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-44788 since 05/07/2026. The exploitability is told to be difficult. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 06/06/2026). MITRE ATT&CK project uses the attack technique T1006 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• adamhathcock

Name

• sharpcompress

Version

• 0.47.0
• 0.47.1
• 0.47.2
• 0.47.3
• 0.47.4

Website

• Product: https://github.com/adamhathcock/sharpcompress/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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