Use After Free in Libfuse
CVE-2026-33150
libfuse is the reference implementation of the Linux FUSE. From version 3.18.0 to before version 3.18.2, a use-after-free vulnerability in the io_uring subsystem of libfuse allows a local attacker to crash FUSE filesystem processes and pot…
Vulnerability class: Use-After-Free
EPSS: 0.000 (0.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Libfuse — versions >= 3.18.0, < 3.18.2
Weakness classification (CWE)
Public proof-of-concept exploits
References
- https://github.com/libfuse/libfuse/security/advisories/GHSA-qxv7-xrc2-qmfx (x_refsource_CONFIRM)
- https://github.com/libfuse/libfuse/commit/49fcd891a58f622c098e2ca67d66086f7b213836 (x_refsource_MISC)
- https://github.com/libfuse/libfuse/releases/tag/fuse-3.18.2 (x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-33150?
- CVE-2026-33150 is a high-severity vulnerability in Libfuse, classified under Use After Free. CVSS score: 7.8/10. Published 2026-03-20.
- How severe is CVE-2026-33150?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2026-33150 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.