CVE-2026-44788Public exploitNetwork attack vector

Extraction-root escape via unchecked directory entry paths

Published May 26, 2026 · Updated May 26, 2026

Path traversal in SharpCompress 0.47.4 and earlier allows remote attackers to escape an extraction root through a malicious ZIP or TAR archive. The sync and async directory-entry branches combine the destination with entry.Key and create the resulting directory without canonicalizing it or checking root bounds. An application must call WriteToDirectory on an untrusted non-solid ZIP or TAR; ZIP permits outside-root directory creation, while TAR permits file writes when a SymbolicLinkHandler follows an unchecked link target.

CVSS severity5.9
Medium
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in SharpCompress 0.47.4 and earlier allows remote attackers to escape an extraction root through a malicious ZIP or TAR archive. The sync and async directory-entry branches combine the destination with entry.Key and create the resulting directory without canonicalizing it or checking root bounds. An application must call WriteToDirectory on an untrusted non-solid ZIP or TAR; ZIP permits outside-root directory creation, while TAR permits file writes when a SymbolicLinkHandler follows an unchecked link target.

The record

CVE
CVE-2026-44788
Published
May 26, 2026
Updated
May 26, 2026
Vendor
Adam Hathcock
Product
SharpCompress
Classifications
CWE-22
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 26, 2026CVE publishedPublication date reported by the CVE source.
  2. May 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=<= 0.47.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Adam Hathcock · SharpCompressversion=<= 0.47.4

Published CVSS scores

5.9GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:L
6.5NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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