CVE-2026-45390
Received Received - Intake
Directory Traversal Vulnerability in OCaml-tar

Publication date: 2026-06-15

Last updated on: 2026-06-15

Assigner: MITRE

Description
In OCaml-tar before 3.4.0, a crafted archive with ../ path segments in its name allows escaping the current working directory. This is not desired behavior, and tar(1) rejects such extractions, but ocaml-tar decompresses it anyway. The impact is that it allows arbitrary file writes outside of the desired extraction directory (to an attacker that can reach a tar decompression endpoint).
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Meta Information
Published
2026-06-15
Last Modified
2026-06-15
Generated
2026-06-16
AI Q&A
2026-06-15
EPSS Evaluated
N/A
NVD
CVE-2026-45390
EUVD
EUVD-2026-36766
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
ocaml ocaml-tar to 3.4.0 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-UNKNOWN
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Executive Summary

In OCaml-tar versions before 3.4.0, there is a vulnerability where a specially crafted archive containing '../' path segments in file names can escape the intended extraction directory.

While the standard tar utility (tar(1)) rejects such extractions to prevent directory traversal, ocaml-tar decompresses these archives anyway, allowing files to be written outside the target directory.

Impact Analysis

This vulnerability allows an attacker who can provide a tar archive to a decompression endpoint using ocaml-tar to write arbitrary files outside the intended extraction directory.

This can lead to overwriting critical files, potentially resulting in unauthorized code execution, data corruption, or system compromise.

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