ast-cli: Path traversal in tar extraction on Linux/macOS allows writes outside the install directory
CVSS score
6.4
EPSS probability
—
Risk score
0.6
Published
2 h ago
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Vulnerability description
DayBreach AI Explanation
Verified against sourcesSources read
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Source agreement
Tam uyum
Evidence confidence
%55
Short explanation
Incomplete validation of extracted archive entry paths in ast-cli tar extraction logic on Linux and macOS allows writing files outside the install directory. S0, S1
In server compromise scenarios, attackers can write arbitrary executable files to arbitrary filesystem paths using path traversal. S0, S1
What should be done?
- Ensure extraction validates that each entry destination resolves within the working directory S0, S1
- Reject absolute paths during archive extraction S0, S1
- Follow vendor advisories for updates S0, S1
Chain of evidence and sources
ast-cli bileşeninin Linux ve macOS sürümlerindeki tar çıkarma mantığında eksik yol doğrulaması bulunmaktadır. S0, S1
Saldırının gerçekleşmesi için download.checkmarx.com sunucusunun ele geçirilerek arşivin değiştirilmesi gerekmektedir. S0, S1
Show the technical text from the sources
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.
CVSS vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:H
CWE: CWE-22
This explanation was compiled automatically from the source records. Scores, active exploitation, patch and exploit status come straight from the sources.
IMPACT: Affected Products and Software
Affected Products
The following products are affected by CVE-2026-77156 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.
| ID | VENDOR | PRODUCT | ACTION |
|---|---|---|---|
| 1 | Checkmarx | github.com/checkmarx/ast-cli | View |
RED HAT CSAF/VEX: Product Impact Check
SCORING: CVSS from Multiple Sources
CVSS Scores
The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.
| SCORE | VERSION | SEVERITY | VECTOR | SOURCE |
|---|---|---|---|---|
| 6.4 | CVSS V3_1 | MEDIUM | CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:H | CVE CNA |
| 6.4 | CVSS V31 | MEDIUM | CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:H | NVD |
| 6.3 | CVSS V4_0 | MEDIUM | CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H | CVE CNA |
| 6.3 | CVSS V40 | MEDIUM | CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X | NVD |
Patch and Remediation Guide
Solution & Remediation Advisory
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Public exploit and active exploitation status
Verified exploit intelligence
No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.
Weakness Classification and Attack Patterns (CWE & CAPEC)
CWE - Common Weakness Enumeration
While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-77156 is associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-77156 weaknesses.
Attack Vector and Accessibility
Official Sources and Advisories
CVSS Vector Radar Chart
6.4 / 10Vulnerability Scoring Details
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:HYama durumu bilinmiyor
Weakness Type (CWE & CAPEC)
Similar Vulnerabilities
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