CVE-2026-44788 SharpCompress: Directory traversal via directory entries in WriteToDirectory (zip slip variant)
Attackers can exploit path traversal in SharpCompress to write arbitrary files outside the extraction directory, potentially leading to code execution.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-44788?
CVE-2026-44788 is a medium-severity path traversal vulnerability in adamhathcock sharpcompress, published on 26 May 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
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.
Weakness: CWE-22
Which versions are affected by CVE-2026-44788?
2 open source packages ship an affected version, including SharpCompress. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
SharpCompress NuGet | All versions | 0.48.0 |
SharpCompress NuGet | All versions | 0.48.0 |
Products include Adamhathcock Sharpcompress.
How do I fix CVE-2026-44788?
Upgrade SharpCompress to 0.48.0 or later.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-44788 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-44788 exists.
Public exploit code: 1 proofs of concept on GitHub.
Other vulnerabilities in adamhathcock sharpcompress
Sources
Also known as ECHO-f93c-a222-1d5f, GHSA-6c8g-7p36-r338.