GHSA-9ffq-6457-8958

Suggest an improvement
Source
https://github.com/advisories/GHSA-9ffq-6457-8958
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-9ffq-6457-8958/GHSA-9ffq-6457-8958.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-9ffq-6457-8958
Aliases
Published
2026-03-25T20:01:04Z
Modified
2026-03-27T21:49:58Z
Severity
  • 8.8 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
Sharp is Vulnerable to Path Traversal via Unsanitized Extension in FileUtil
Details

Summary

A path traversal vulnerability exists in the FileUtil class of the code16/sharp package. The application fails to sanitize file extensions properly, allowing path separators to be passed into the storage layer.

Detail

In src/Utils/FileUtil.php, the FileUtil::explodeExtension() function extracts a file's extension by splitting the filename at the last dot. However, the extracted extension is never sanitized. While the application uses a normalizeName() function, this function only cleans the base filename, meaning any path separators (such as /) injected into the extension will survive and be passed into the storeAs() function.

Impact

Exploiting this flaw allows an authenticated attacker to manipulate file paths:

  • Files can be written outside of the intended tmp directory via path traversal. For more details on the package, visit: https://github.com/code16/sharp
  • Existing critical files (such as .env or configuration files) could potentially be overwritten. Review the CWE definition here: https://cwe.mitre.org/data/definitions/22.html (Note: This vulnerability was successfully chained with CWE-434 in a local Proof of Concept to confirm the traversal.)

Patches

This issue has been patched by properly sanitizing the extension using pathinfo(PATHINFO_EXTENSION) instead of strrpos(), alongside applying strict regex replacements to both the base name and the extension. The fix is available in pull request #715

Credits

Reported by zaurgsynv.

Database specific 
{
    "cwe_ids": [
        "CWE-22"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-25T20:01:04Z",
    "nvd_published_at": "2026-03-26T22:16:31Z",
    "severity": "HIGH"
}
References

Affected packages

Packagist / code16/sharp

Package

Name
code16/sharp
Purl
pkg:composer/code16/sharp

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
9.20.0

Affected versions

v4.*
v4.0-BETA1
v4.0-BETA2
v4.0-BETA3
v4.0-BETA4
v4.0-BETA5
v4.0-BETA6
v4.0.0
v4.0.1
v4.0.2
v4.0.3
v4.0.4
v4.0.5
v4.0.6
v4.0.7
v4.0.8
v4.0.9
v4.0.10
v4.0.11
v4.0.12
v4.0.13
v4.0.14
v4.0.15
v4.0.16
v4.0.17
v4.0.18
v4.0.19
v4.0.20
v4.0.21
v4.1.0
v4.1.1
v4.1.2
v4.1.3
v4.1.4
v4.1.5
v4.1.6
v4.1.7
v4.1.8
v4.1.9
v4.1.10
v4.1.11
v4.1.12
v4.1.13
v4.1.14
v4.1.15
v4.1.16
v4.1.17
v4.1.18
v4.1.19
v4.1.20
v4.1.21
v4.1.22
v4.1.23
v4.1.24
v4.1.25
v4.2.0
v4.2.1
v4.2.2
v4.2.3
v4.2.4
v4.2.5
v4.2.6
v5.*
v5.0.0-alpha.1
v5.0.0-alpha.2
v5.0.0-alpha.3
v5.0.0-alpha.4
v5.0.0-alpha.5
v5.0.0-alpha.6
v5.0.0-alpha.7
v5.0.0-alpha.8
v5.0.0-alpha.9
v5.0.0-alpha.10
v5.0.0
v5.0.1
v5.1.0
v5.1.1
v5.1.2
v5.2.0
v5.3.0
v5.3.1
v5.3.2
v5.3.3
v5.3.4
v5.3.5
v5.4.0
v5.4.1
v5.4.2
v5.4.3
v5.4.4
v5.4.5
v5.4.6
v6.*
v6.0.0-alpha.1
v6.0.0-alpha.2
v6.0.0-alpha.3
v6.0.0-alpha.4
v6.0.0-alpha.5
v6.0.0-alpha.6
v6.0.0-alpha.7
v6.0.0-beta.1
v6.0.0-beta.2
v6.0.0-beta.3
v6.0.0
v6.0.1
v6.1.0
v6.1.1
v6.1.2
v6.1.3
v6.1.4
v6.1.5
v6.2.0
v6.3.0
v6.3.1
v6.3.2
v6.3.3
v6.4.0
v6.4.1
v6.5.0
v6.5.1
v6.5.2
v6.5.3
v6.5.4
v6.5.5
7.*
7.0.0-alpha.1
7.7.2
7.27.0
v7.*
v7.0.0-beta.1
v7.0.0-beta.2
v7.0.0-beta.3
v7.0.0-beta.4
v7.0.0-beta.5
v7.0.0-beta.6
v7.0.0
v7.0.1
v7.0.2
v7.1.0
v7.2.0
v7.2.1
v7.2.2
v7.2.3
v7.2.4
v7.2.5
v7.3.0
v7.4.0
v7.5.0
v7.5.1
v7.5.2
v7.6.0
v7.7.0
v7.7.1
v7.8.0
v7.9.0
v7.10.0
v7.11.0
v7.12.0
v7.13.0
v7.14.0
v7.15.0
v7.16.0
v7.17.0
v7.17.1
v7.17.2
v7.17.3
v7.18.0
v7.19.0
v7.19.1
v7.20.0
v7.21.0
v7.22.0
v7.23.0
v7.23.1
v7.23.2
v7.24.0
v7.24.1
v7.25.0
v7.25.1
v7.25.2
v7.26.0
v7.26.1
v7.26.2
v7.27.1
v7.28.0
v7.29.0
v7.29.1
v7.29.2
v7.29.3
v7.29.4
v7.29.5
v7.29.6
v7.29.7
v7.30.0
v8.*
v8.0.0
v8.0.1
v8.0.2
v8.0.3
v8.0.4
v8.0.5
v8.0.6
v8.0.7
v8.1.0
v8.1.1
v8.1.2
v8.2.0
v8.2.1
v8.3.0
v8.3.1
v8.3.2
v8.3.3
v8.3.4
v8.3.5
v8.3.6
v8.3.7
v8.4.0
v8.4.1
v8.4.2
v8.4.3
v8.4.4
v8.5.0
v8.6.0
v8.6.1
v9.*
v9.0.0-alpha.1
v9.0.0-alpha.2
v9.0.0-beta.1
v9.0.0-beta.2
v9.0.0-beta.3
v9.0.0-beta.4
v9.0.0-beta.5
v9.0.0-beta.6
v9.0.0-beta.7
v9.0.0-beta.8
v9.0.0-beta.9
v9.0.0-beta.10
v9.0.0-beta.11
v9.0.0-beta.12
v9.0.0-beta.13
v9.0.0-beta.14
v9.0.0-beta.15
v9.0.0-beta.16
v9.0.0-beta.17
v9.0.0
v9.0.1
v9.0.2
v9.0.3
v9.0.4
v9.0.5
v9.0.6
v9.0.7
v9.0.8
v9.0.9
v9.1.0
v9.1.1
v9.1.2
v9.2.0
v9.2.1
v9.2.2
v9.2.3
v9.2.4
v9.2.5
v9.2.6
v9.2.7
v9.2.8
v9.3.0
v9.3.1
v9.3.2
v9.3.3
v9.3.4
v9.3.5
v9.3.6
v9.3.7
v9.4.0
v9.4.1
v9.5.0
v9.5.1
v9.5.2
v9.6.0
v9.6.1
v9.6.2
v9.6.3
v9.6.4
v9.6.5
v9.6.6
v9.7.0
v9.7.1
v9.7.2
v9.7.3
v9.8.0
v9.8.1
v9.9.0
v9.10.0
v9.10.1
v9.10.2
v9.11.0
v9.11.1
v9.12.0
v9.13.0
v9.13.1
v9.14.0
v9.14.1
v9.14.2
v9.14.3
v9.14.4
v9.15.0
v9.15.1
v9.16.0
v9.16.1
v9.17.0
v9.17.1
v9.18.0
v9.19.0
v9.19.1
v9.19.2
v9.19.3

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-9ffq-6457-8958/GHSA-9ffq-6457-8958.json"