PT-2026-26679 · Libfuse · Libfuse

Agabhin · Published 2026-03-20 · Updated 2026-03-27 · CVE-2026-33179

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions libfuse versions 3.18.0 through 3.18.1

Description libfuse, the reference implementation of the Linux FUSE, contains a flaw in the fuse uring init queue function. A NULL pointer dereference and memory leak can occur when setting up the io uring queue, specifically when numa alloc local fails. This can lead to a local user crashing the FUSE daemon or causing resource exhaustion. The traditional /dev/fuse path is not affected; only the io uring transport is vulnerable.

Recommendations Update to version 3.18.2 or later.

Exploit

Fix

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

CVE-2026-33179

GHSA-X669-V3MQ-R358

Affected Products

Libfuse

References · 15

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33179.json · Exploit
• https://github.com/libfuse/libfuse/commit/7beb86c09b6ec5aab14dc25256ed8a5ad18554d7 · Patch
• https://github.com/libfuse/libfuse/security/advisories/GHSA-x669-v3mq-r358 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-33179 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-33179 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-33179 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-33179 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-33179 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-33179 · Vendor Advisory
• https://osv.dev/vulnerability/BELL-CVE-2026-33179 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-33179 · Security Note
• https://github.com/libfuse/libfuse/releases/tag/fuse-3.18.2 · Note
• https://twitter.com/CVEnew/status/2035262156766155030 · Twitter Post
• https://twitter.com/oss_security/status/2035184297850679649 · Twitter Post
• https://docs.bell-sw.com/security/cves/CVE-2026-33179 · Note