Path Traversal in SharpZipLib
Priority HIGH 75CWE-22Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub.
Summary
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.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.01906 79th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed sharpziplib (icsharpcode): 1.3.3SharpZipLib (NuGet): 1.3.3
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| icsharpcode | sharpziplib | 1.3.3 to before 1.3.3; 0.86.0 and later | 1.3.3 | Patch available | CNA |
| — | SharpZipLib (NuGet) | before 1.3.3 | 1.3.3 | Patch available | GHSA-m22m-h4rf-pwq3 |
- sharpziplib Vendoricsharpcode Affected 1.3.3 to before 1.3.3; 0.86.0 and later Fixed in 1.3.3 Patch available CNA
- SharpZipLib (NuGet) Vendor— Affected before 1.3.3 Fixed in 1.3.3 Patch available GHSA-m22m-h4rf-pwq3
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:sharpziplib_project:sharpziplib:*:*:*:*:*:*:*:* | before 1.3.3 | Vulnerable | icsharpcode |
- cpe:2.3:a:sharpziplib_project:sharpziplib:*:*:*:*:*:*:*:* Versions before 1.3.3 Vulnerable ·icsharpcode
Remediation
- Fix · CNA sharpziplib (icsharpcode) Fixed in 1.3.3
- Fix · GHSA-m22m-h4rf-pwq3 SharpZipLib (NuGet) Fixed in 1.3.3 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2021-32840
- 2026-10-03 Alias added: GHSA-m22m-h4rf-pwq3
References
Advisory 3
More icsharpcode Sharpziplib vulnerabilities
- TI-2021-12507 Path Traversal in SharpZipLib CVSS 3.1MEDIUM 5.3
- TI-2021-12506 Path Traversal in SharpZipLib CVSS 3.1MEDIUM 5.3
- TI-2018-16140 Path traversal in SharpZipLib CVSS 3.1MEDIUM 5.5
Sources
- CVE-2021-32840 · CVE Program
- CVE-2021-32840 · NVD
- FIRST EPSS
- GHSA-m22m-h4rf-pwq3 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences