Hello oss-security, A stack-based buffer overflow vulnerability was identified in GNU libextractor's OLE2 plugin for versions prior to 1.15. The vulnerability has been assigned CVE-2026-91752.
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 (Denial of Service). In multi-threaded contexts using EXTRACTOR_OPTION_IN_PROCESS, the overflow bypasses -fstack-clash-protection by overflowing into adjacent thread stack frames, allowing for arbitrary Code Execution. Affected Versions: libextractor >= 0, < 1.15 Fix: The issue is patched in GNU libextractor version 1.15. References: CVE Record: https://www.cve.org/CVERecord?id=CVE-2026-91752 VulnCheck Advisory: https://www.vulncheck.com/advisories/gnu-libextractor-before-1.15-stack-overflow-via-ole2 PoC & Technical Details: https://github.com/Haitam-lazaar/libextractor-ole2-rce Upstream Patches: - https://git.gnunet.org/gnunet/libextractor/commit/04004eb19033e093938138b09befdf31e71e8522.html - https://git.gnunet.org/gnunet/libextractor/commit/2781c7e9095f4ddaff4f535d69342f3903b18422.html GNU libextractor: https://www.gnu.org/software/libextractor/ Regards, Haitam Lazaar
