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Vulnerability record · CVE-2021-32840 · published 26 January 2022

CVE-2021-32840: Sharpziplib project sharpziplib path traversal vulnerability

Sharpziplib Project · Sharpziplib

SharpZipLib (or #ziplib) is a Zip, GZip, Tar and BZip2 library. Prior to version 1.3.3, a TAR file entry `../evil.txt` may be extracted in the parent directory of `destFolder`. This leads to arbitrary file write that may lead to code execution. The vulnerability was patched in version 1.3.3.

9.8 CVSS 3.1 Critical EPSS 2.0% · top 20.4% CWE-22 · Path traversal
9.8CVSS 3.1 base score, v2 7.5
2.0%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

SharpZipLib (or #ziplib) is a Zip, GZip, Tar and BZip2 library. Prior to version 1.3.3, a TAR file entry `../evil.txt` may be extracted in the parent directory of `destFolder`. This leads to arbitrary file write that may lead to code execution. The vulnerability was patched in version 1.3.3.

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

Affected products

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

References

LinkTags
https://github.com/icsharpcode/SharpZipLib/commit/a0e96de70b5264f4c919b09253b1522bc7a221cc PatchThird Party Advisory
https://github.com/icsharpcode/SharpZipLib/releases/tag/v1.3.3 Third Party Advisory
https://securitylab.github.com/advisories/GHSL-2021-125-sharpziplib/ ExploitThird Party Advisory
https://github.com/icsharpcode/SharpZipLib/commit/a0e96de70b5264f4c919b09253b1522bc7a221cc PatchThird Party Advisory
https://github.com/icsharpcode/SharpZipLib/releases/tag/v1.3.3 Third 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-2021-32840), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.