Checkmarx Ast-cli up to 2.3.50 Tar Extraction path traversal

Summaryinfo

A vulnerability, which was classified as problematic, has been found in Checkmarx Ast-cli up to 2.3.50. Affected by this issue is some unknown functionality of the component Tar Extraction. Performing a manipulation results in path traversal. This vulnerability is cataloged as CVE-2026-77156. It is possible to initiate the attack remotely. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic has been found in Checkmarx Ast-cli up to 2.3.50. This affects an unknown functionality of the component Tar Extraction. The manipulation with an unknown input leads to a path traversal vulnerability. CWE is classifying the issue as CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Incomplete validation of extracted archive entry paths in ast-cli's tar extraction logic on Linux and macOS (used when installing the Vorpal ASCA real-time engine and the SCA Resolver) would allow a malicious tar archive containing absolute or traversal path entries to write files outside the install directory. Windows builds were not affected, as the Windows extractor performs this path validation. Exploitation required substituting the archive served at "download.checkmarx.com". An attacker able to compromise that server and replace the archive could write arbitrary, executable files to arbitrary filesystem paths via this path traversal. Extraction now validates that each entry's destination path resolves within the working directory and rejects absolute paths.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-77156 since 08/20/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Additional levels of successful authentication are needed for exploitation. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1006 for this issue.

Upgrading to version 2.3.51 eliminates this vulnerability.

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Productinfo

Vendor

• Checkmarx

Name

• Ast-cli

Version

• 2.3.0
• 2.3.1
• 2.3.2
• 2.3.3
• 2.3.4
• 2.3.5
• 2.3.6
• 2.3.7
• 2.3.8
• 2.3.9
• 2.3.10
• 2.3.11
• 2.3.12
• 2.3.13
• 2.3.14
• 2.3.15
• 2.3.16
• 2.3.17
• 2.3.18
• 2.3.19
• 2.3.20
• 2.3.21
• 2.3.22
• 2.3.23
• 2.3.24
• 2.3.25
• 2.3.26
• 2.3.27
• 2.3.28
• 2.3.29
• 2.3.30
• 2.3.31
• 2.3.32
• 2.3.33
• 2.3.34
• 2.3.35
• 2.3.36
• 2.3.37
• 2.3.38
• 2.3.39
• 2.3.40
• 2.3.41
• 2.3.42
• 2.3.43
• 2.3.44
• 2.3.45
• 2.3.46
• 2.3.47
• 2.3.48
• 2.3.49
• 2.3.50

CPE 2.3info

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CPE 2.2info

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