CVE-2026-37531
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Zip Slip Path Traversal in AGL app-framework-main

Publication date: 2026-05-01

Last updated on: 2026-05-18

Assigner: MITRE

Description
AGL app-framework-main thru 17.1.12 contains a Zip Slip path traversal vulnerability (CWE-22) combined with a TOCTOU race condition (CWE-367) in the widget installation flow. The is_valid_filename function in wgtpkg-zip.c validates ZIP entry names but does not check for dot notation directory traversal sequences it only blocks absolute paths. The zread extraction function uses openat(workdirfd, filename, O_CREAT) which resolves dot notation values relative to the work directory, allowing files to be written anywhere on the filesystem. Critically, in function install_widget in file wgtpkg-install.c, extraction via zread occurs BEFORE signature verification via check_all_signatures. Even if signature verification fails, the error cleanup (remove_workdir) only deletes the temporary work directory files written outside via path traversal persist permanently.
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Meta Information
Published
2026-05-01
Last Modified
2026-05-18
Generated
2026-06-16
AI Q&A
2026-05-01
EPSS Evaluated
2026-06-15
NVD
CVE-2026-37531
EUVD
EUVD-2026-26685
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
linuxfoundation automotive_grade_linux to 17.1.12 (inc)
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-367 The product checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check.
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.
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Compliance Impact

The vulnerability allows unauthorized file writes anywhere on the filesystem before signature verification, potentially leading to unauthorized data modification or persistence of malicious files. This can result in a high impact on confidentiality, integrity, and availability of data.

Such impacts could affect compliance with standards and regulations like GDPR and HIPAA, which require protection of sensitive data and system integrity. However, the provided information does not explicitly state the compliance implications.

Executive Summary

This vulnerability exists in the AGL app-framework-main up to version 17.1.12 and involves a Zip Slip path traversal combined with a TOCTOU (Time Of Check to Time Of Use) race condition during the widget installation process.

The function is_valid_filename attempts to validate ZIP entry names but only blocks absolute paths and does not prevent directory traversal sequences using dot notation (e.g., ../).

During extraction, the zread function uses openat with the working directory file descriptor, which resolves dot notation paths relative to the work directory, allowing files to be written anywhere on the filesystem.

Critically, the extraction happens before signature verification, so even if the signature check fails, files written outside the temporary directory via path traversal remain on the system because the cleanup only removes files inside the temporary directory.

Impact Analysis

This vulnerability can have severe impacts as it allows an attacker to write arbitrary files anywhere on the filesystem without proper authorization.

Because the extraction occurs before signature verification, malicious files can persist even if the signature check fails, potentially leading to unauthorized code execution, system compromise, or data corruption.

The CVSS score of 9.8 indicates a critical severity with high impact on confidentiality, integrity, and availability.

Mitigation Strategies

To mitigate this vulnerability, immediate steps should focus on preventing exploitation of the Zip Slip path traversal and TOCTOU race condition in the widget installation flow.

  • Avoid using vulnerable versions of the AGL app-framework-main (up to 17.1.12) until a patch or update is available.
  • Restrict or monitor the installation of widgets from untrusted sources to reduce risk of malicious ZIP files exploiting path traversal.
  • Implement additional file system monitoring to detect unexpected file writes outside intended directories.
  • If possible, apply patches or updates from the vendor that address the validation of ZIP entry names and ensure signature verification occurs before extraction.
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