CVE-2026-100310
GNU libextractor before 1.16 Privilege Escalation via LIBEXTRACTOR_PREFIX
- Published
- Sep 25, 2026
- Updated
- Sep 30, 2026
- Assigning CNA
- VulnCheck
- Evidence observed
- Sep 25, 2026
Primary CVSS
nvd · CVSS 4.0
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/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
- 2.7%
- Model date
- Oct 17, 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 1.16 loads plugins from an untrusted search path specified by the LIBEXTRACTOR_PREFIX environment variable without proper privilege checks. A local attacker can exploit this by setting LIBEXTRACTOR_PREFIX to a directory containing a malicious plugin that executes arbitrary code with elevated privileges when loaded by a setuid or setgid program.
Sources
Proof-of-concept for CVE-2026-100310, a local privilege escalation in GNU libextractor ≤1.15 via the LIBEXTRACTOR_PREFIX untrusted search path, with exploit code and patch analysis.
Responsible use
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