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CVE-2026-77156— ast-cli: Path traversal in tar extraction on Linux/macOS allows writes outside the install directory

Quick assessment

Affected
Checkmarx github.com/checkmarx/ast-cli
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Linux 和 macOS 系统上，ast-cli 的 tar 解压逻辑对解压后的归档条目路径验证不完整（该逻辑用于安装 Vorpal ASCA 实时引擎和 SCA Resolver）。攻击者可利用包含绝对路径或路径遍历条目的恶意 tar 归档，将文件写入安装目录之外的位置。Windows 构建版本未受此影响，因为其解压器已执行了相应的路径验证。 利用此漏洞需要替换由 提供的归档文件。若攻击者能够入侵该服务器并替换归档文件，即可通过此路径遍历漏洞在任意文件系统路径下写入任意可执行文件。 修复措施：现在在解压过程

CVSS 6.4 · Medium

Affected Version Matrix 2

VendorProduct Version RangeStatus
Checkmarx github.com/checkmarx/ast-cli < 2.3.51 affected
2.3.51 unaffected
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I. Basic Information for CVE-2026-77156

Vulnerability Information
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Vulnerability Title
ast-cli: Path traversal in tar extraction on Linux/macOS allows writes outside the install directory
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Checkmarx github.com/checkmarx/ast-cli 0 ~ 2.3.51 -

II. Public POCs for CVE-2026-77156

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III. Intelligence Information for CVE-2026-77156

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Other References for CVE-2026-77156 (3)

IV. Related Vulnerabilities

Same product: github.com/checkmarx/ast-cli
Same vendor: Checkmarx
Same weakness: CWE-22

V. Comments for CVE-2026-77156

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