CVE-2021-39208: SharpCompress is a fully managed C# library to deal with many compression types and formats

Q: How do I fix CVE-2021-39208?

sharpcompress: upgrade to 0.29.0. Exact commands for each OS are on this page.

Q: Is CVE-2021-39208 being exploited?

CVE-2021-39208 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-39208 affect?

CVE-2021-39208 affects sharpcompress. Severity is medium (CVSS 4.3). SharpCompress is a fully managed C# library to deal with many compression types and formats. Versions prior to 0.29.0 are vulnerable to partial path traversal. SharpCompress recreates a hierarchy of directories under destinationDirectory if

Q: How urgent is CVE-2021-39208?

Priority 37/100. Public exploit reference

Routine

MEDIUM 4.3UPGRADE

CVE-2021-39208 is a medium-severity flaw (CVSS 4.3) affecting sharpcompress. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

SharpCompress is a fully managed C# library to deal with many compression types and formats. Versions prior to 0.29.0 are vulnerable to partial path traversal. SharpCompress recreates a hierarchy of directories under destinationDirectory if ExtractFullPath is set to true in options. In order to prevent extraction outside the destination directory the destinationFileName path is verified to begin with fullDestinationDirectoryPath. However, prior t

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	4.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.2% (top 32%)
CISA exploited list	No
Weakness	CWE-22
Published	2021-09-16
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: sharpcompress project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-09-16 15:15 UTCPublished CVE record published
2026-06-17 04:03 UTCUpdated Record last modified

sharpcompress project sharpcompress UPGRADE

Affected: < 0.29.0

Fixed in: 0.29.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy sharpcompress || rpm -q sharpcompress || sharpcompress --version

2. UPGRADE to 0.29.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade sharpcompress

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade sharpcompress

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-39208?

sharpcompress: upgrade to 0.29.0. Exact commands for each OS are on this page.

Is CVE-2021-39208 being exploited?

CVE-2021-39208 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-39208 affect?

CVE-2021-39208 affects sharpcompress. Severity is medium (CVSS 4.3). SharpCompress is a fully managed C# library to deal with many compression types and formats. Versions prior to 0.29.0 are vulnerable to partial path traversal. SharpCompress recreates a hierarchy of directories under destinationDirectory if

How urgent is CVE-2021-39208?

Priority 37/100. Public exploit reference

Related CVEs

CVE-2026-44788 MEDIUM 5.9 UPGRADE SharpCompress is a fully managed C# library to deal with many compression types and formats

References

← Back to latest CVEs