CVE-2026-91752
GNU libextractor before 1.15 Stack Overflow via OLE2
- Published
- Sep 15, 2026
- Updated
- Sep 17, 2026
- Assigning CNA
- VulnCheck
- Evidence observed
- Sep 17, 2026
Primary CVSS
nvd · CVSS 4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/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:XLow · next 30 days
- Percentile
- 35.4%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
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.
Sources
1PoC for a Critical stack-based buffer overflow in GNU libextractor ≤ 1.14. A malicious .doc file triggers an unbounded VLA allocation causing unconditional DoS. In multi-threaded environments, it bypasses stack-clash protections for full RCE.
Responsible use
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