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CVE-2026-77156

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

3 h ago

OverviewPublic Exploits (0)NewsroomVulnerability Timeline
Patch status has not yet been verified

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Vulnerability description

DayBreach AI Explanation

Verified against sources

CVE-2026-77156: ast-cli Path Traversal Vulnerability in Tar Extraction on Linux and macOS

Sources read

1

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

Why does it matter?

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 sources2 verified claims

ast-cli bileşeninin Linux ve macOS sürümlerindeki tar çıkarma mantığında eksik yol doğrulaması bulunmaktadır. S0, S1

S0 · daybreach-canonicalS1 · cvelist

Saldırının gerçekleşmesi için download.checkmarx.com sunucusunun ele geçirilerek arşivin değiştirilmesi gerekmektedir. S0, S1

S0 · daybreach-canonicalS1 · cvelist
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.

IDVENDORPRODUCTACTION
1Checkmarxgithub.com/checkmarx/ast-cli View
Total affected vendors: 1|Products: 1

RED HAT CSAF/VEX: Product Impact Check

Red Hat has not yet published a CSAF/VEX impact record for this CVE. This does not mean “not affected”.

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.

SCOREVERSIONSEVERITYVECTORSOURCE
6.4CVSS V3_1MEDIUMCVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:HCVE CNA
6.4CVSS V31MEDIUMCVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:HNVD
6.3CVSS V4_0MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:HCVE CNA
6.3CVSS V40MEDIUMCVSS: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:XNVD

Patch and Remediation Guide

Solution & Remediation Advisory

Patch status unknown

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

Confirm the affected product and version against the source evidence above.
Restrict access to internet-facing services and apply network segmentation.
Until a patch is confirmed, follow the vendor advisory; do not read an unknown status as “no patch”.
Monitor server logs and network endpoints for signs of anomalous execution.

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:

CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

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.

CAPEC-66: SQL InjectionCAPEC-126: Path TraversalCAPEC-28: OS Command Injection

Attack Vector and Accessibility

ExposureAğ üzerinden
PermissionsHigh
UserGerekiyor

Official Sources and Advisories

https://github.com/Checkmarx/ast-clivendor-advisoryhttps://github.com/Checkmarx/ast-cli/security/advisories/GHSA-9gff-3q53-q75xvendor-advisory

CVSS Vector Radar Chart

6.4 / 10
Attack VectorNetworkComplexityHighPrivilegesHighUser Interact.RequiredConfidentialityHighIntegrityHighAvailabilityHigh

Vulnerability Scoring Details

CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:H
Attack VectorNetwork
Attack ComplexityHigh
Privileges RequiredHigh privileges
User Interaction—
Confidentiality (Gizlilik)High
Integrity (Bütünlük)High
Availability (Erişilebilirlik)High

Yama durumu bilinmiyor

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

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C
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Checkmarx

Weakness Type (CWE & CAPEC)

CWE-22

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CVE-2026-77156 · ast-cli: Path traversal in tar extraction…