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Vulnerability record · CVE-2021-32842 · published 26 January 2022

CVE-2021-32842: Sharpziplib project sharpziplib path traversal vulnerability

Sharpziplib Project · Sharpziplib

SharpZipLib (or #ziplib) is a Zip, GZip, Tar and BZip2 library. Starting version 1.0.0 and prior to version 1.3.3, a check was added if the destination file is under a destination directory. However, it is not enforced that `_baseDirectory` ends with slash. If the _baseDirectory 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. Version 1.3.3 fixed this vulnerability.

5.3 CVSS 3.1 Medium EPSS 0.90% · top 42.1% CWE-22 · Path traversal
5.3CVSS 3.1 base score, v2 5.0
0.90%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

SharpZipLib (or #ziplib) is a Zip, GZip, Tar and BZip2 library. Starting version 1.0.0 and prior to version 1.3.3, a check was added if the destination file is under a destination directory. However, it is not enforced that `_baseDirectory` ends with slash. If the _baseDirectory 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. Version 1.3.3 fixed this vulnerability.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/icsharpcode/SharpZipLib/releases/tag/v1.3.3 Release NotesThird Party Advisory
https://securitylab.github.com/advisories/GHSL-2021-125-sharpziplib/ ExploitThird Party Advisory
https://github.com/icsharpcode/SharpZipLib/releases/tag/v1.3.3 Release NotesThird Party Advisory
https://securitylab.github.com/advisories/GHSL-2021-125-sharpziplib/ ExploitThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-32842), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.