How severe is CVE-2026-33150?

CVE-2026-33150 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-33150 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-33150?

CVE-2026-33150 affects Libfuse Project Libfuse. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-33150?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-33150 have an EU (EUVD) identifier?

Yes. CVE-2026-33150 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-13786.

When was CVE-2026-33150 published?

CVE-2026-33150 was published on 2026-03-20 and last updated on 2026-06-30.

CVE-2026-33150

CVE-2026-33150 is a high-severity vulnerability in Libfuse Project Libfuse with a CVSS 3.x base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-416.

Key facts

Severity: High (CVSS 3.x base score 7.8)
EPSS exploit prediction: 0% (23rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-13786
Weakness: CWE-416
Affected product: Libfuse Project Libfuse
Published: 2026-03-20
Last modified: 2026-06-30

Description

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 potentially execute arbitrary code. When io_uring thread creation fails due to resource exhaustion (e.g., cgroup pids.max), fuse_uring_start() frees the ring pool structure but stores the dangling pointer in the session state, leading to a use-after-free when the session shuts down. The trigger is reliable in containerized environments where cgroup pids.max limits naturally constrain thread creation. This issue has been patched in version 3.18.2.

Frequently asked questions

What is 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 potentially execute arbitrary code. When io_uring thread creation fails due to resource exhaustion (e.g., cgroup pids.max), fuse_uring_start() frees the ring pool structure but stores the dangling pointer in the session state, leading to a use-after-free when the session shuts down. The trigger is reliable in containerized environments where cgroup pids.max limits naturally constrain thread creation. This issue has been patched in version 3.18.2.
How severe is CVE-2026-33150?: CVE-2026-33150 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-33150 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-33150?: CVE-2026-33150 affects Libfuse Project Libfuse. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-33150?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-33150 have an EU (EUVD) identifier?: Yes. CVE-2026-33150 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-13786.
When was CVE-2026-33150 published?: CVE-2026-33150 was published on 2026-03-20 and last updated on 2026-06-30.

References

Affected products (1)

cpe:2.3:a:libfuse_project:libfuse:*:*:*:*:*:*:*:*

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