How severe is CVE-2026-47104?

CVE-2026-47104 has a CVSS 3.x base score of 4.0, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2026-47104 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (3rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-47104?

CVE-2026-47104 affects Libusb. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-47104?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-47104 have an EU (EUVD) identifier?

Yes. CVE-2026-47104 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-32500.

When was CVE-2026-47104 published?

CVE-2026-47104 was published on 2026-05-27 and last updated on 2026-06-17.

CVE-2026-47104

CVE-2026-47104 is a medium-severity vulnerability in Libusb with a CVSS 3.x base score of 4.0. 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-125.

Key facts

Severity: Medium (CVSS 3.x base score 4.0)
CVSS v4: 5.1
EPSS exploit prediction: 0% (3rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-32500
Weakness: CWE-125
Affected product: Libusb
Published: 2026-05-27
Last modified: 2026-06-17

Description

libusb before version 1.0.30 contains a one-byte out-of-bounds read vulnerability in parse_iad_array() in descriptor.c that allows attackers to trigger a denial of service by supplying a malformed USB descriptor whose bLength equals size minus one, causing the bounds check to use the original buffer size instead of the remaining size. Attackers in virtualized environments with USB passthrough can supply crafted descriptors through libusb_get_active_interface_association_descriptors or libusb_get_interface_association_descriptors to read one byte past the end of the malloc allocation, resulting in a denial of service.

Frequently asked questions

What is CVE-2026-47104?: libusb before version 1.0.30 contains a one-byte out-of-bounds read vulnerability in parse_iad_array() in descriptor.c that allows attackers to trigger a denial of service by supplying a malformed USB descriptor whose bLength equals size minus one, causing the bounds check to use the original buffer size instead of the remaining size. Attackers in virtualized environments with USB passthrough can supply crafted descriptors through libusb_get_active_interface_association_descriptors or libusb_get_interface_association_descriptors to read one byte past the end of the malloc allocation, resulting in a denial of service.
How severe is CVE-2026-47104?: CVE-2026-47104 has a CVSS 3.x base score of 4.0, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2026-47104 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (3rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-47104?: CVE-2026-47104 affects Libusb. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-47104?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-47104 have an EU (EUVD) identifier?: Yes. CVE-2026-47104 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-32500.
When was CVE-2026-47104 published?: CVE-2026-47104 was published on 2026-05-27 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:libusb:libusb:*:*:*:*:*:*:*:*

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