CVE-2026-91752
Received Received - Intake

Stack-based Buffer Overflow in GNU libextractor

Publication date: 2026-09-15

Last updated on: 2026-09-15

Assigner: VulnCheck

Description
GNU libextractor before 1.15 contains a stack-based buffer overflow vulnerability in the process_star_office function that sizes a variable-length stack array from attacker-controlled OLE2 stream data. Attackers can craft malicious StarOffice documents that allocate up to 4 MB on the stack, causing stack overflow and crashing any application extracting metadata from the document.

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Meta Information

Published
2026-09-15
Last Modified
2026-09-15
Generated
2026-09-15
AI Q&A
2026-09-15
EPSS Evaluated
N/A
NVD
CVE-2026-91752
EUVD
EUVD-2026-78234

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
gnu libextractor to 1.15 (exc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-789 The product allocates memory based on an untrusted, large size value, but it does not ensure that the size is within expected limits, allowing arbitrary amounts of memory to be allocated.

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Executive Summary

CVE-2026-91752 is a stack-based buffer overflow in GNU libextractor before version 1.15. The vulnerability occurs in the process_star_office function when it allocates a variable-length stack array based on attacker-controlled OLE2 stream data from malicious StarOffice documents. Attackers can force the allocation of up to 4 MB on the stack, causing a stack overflow that crashes any application extracting metadata from the document.

Detection Guidance

To detect this vulnerability, check if your system uses GNU libextractor versions 1.14 or earlier. Run 'libextractor --version' to verify the installed version. If it shows 1.14 or below, the system is vulnerable. Additionally, inspect any applications processing .doc files for crashes when handling StarOffice documents.

Impact Analysis

This vulnerability allows attackers to crash applications processing untrusted StarOffice documents, leading to denial of service. In multi-threaded environments, it may bypass stack-clash protections and enable remote code execution by exploiting adjacent thread stacks. Any software using libextractor to process .doc files could be affected.

Mitigation Strategies

Immediately upgrade GNU libextractor to version 1.15 or later using your package manager. For example, run 'sudo apt-get update && sudo apt-get install libextractor1' on Debian-based systems. Avoid processing untrusted .doc files until the update is applied.

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