Vulnerability · Published Jan 26, 2022 · Assigned by GitHub_M
CVE-2021-32840Path Traversal in SharpZipLib
High 7.3
In plain English
A high-severity path traversal in sharpziplib from icsharpcode. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 1.9% (higher than 80% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)7.3High
Exploit odds (30 days)1.9%top 20.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| NuGet | sharpziplib | 1.3.3 | GHSA-m22m-h4rf-pwq3 |
| Ubuntu:22.04:LTS | mono | no fix listed | UBUNTU-CVE-2021-32840 |
| Ubuntu:24.04:LTS | mono | no fix listed | UBUNTU-CVE-2021-32840 |
| Ubuntu:25.10 | mono | no fix listed | UBUNTU-CVE-2021-32840 |
| Ubuntu:26.04:LTS | mono | no fix listed | UBUNTU-CVE-2021-32840 |
| Ubuntu:26.10 | mono | no fix listed | UBUNTU-CVE-2021-32840 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| icsharpcode | sharpziplib | 1.3.3 – before 1.3.30.86.0 – before 0.86.0* |
Weakness: CWE-22 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L