Stack-based Buffer Overflow in GNU libextractor Affects Metadata Extraction
CVE-2026-91752

8.7HIGH

Key Information:

Vendor

Gnu
Status
Libextractor
Vendor
CVE Published:
15 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-91752?

GNU libextractor, prior to version 1.15, is susceptible to a stack-based buffer overflow vulnerability in its process_star_office function. This issue arises from the improper handling of variable-length stack arrays sized based on attacker-controlled OLE2 stream data. Malicious actors can exploit this vulnerability by crafting specially designed StarOffice documents that may allocate up to 4 MB on the stack, resulting in a stack overflow. This can lead to crashes in any application that attempts to extract metadata from these documents, posing significant security risks to users relying on this software.

Affected Version(s)

libextractor 0 < 1.15

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-91752 - Proof of Concept

References

https://github.com/Haitam-lazaar/libextractor-ole2-rce
exploitthird-party-advisory
https://git.gnunet.org/gnunet/libextractor/commit/04004eb...
patch
https://git.gnunet.org/gnunet/libextractor/commit/2781c7e...
patch

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Haitam Lazaar
.