How severe is CVE-2026-23679?

CVE-2026-23679 has a CVSS 3.x base score of 6.2, 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 high.

Is CVE-2026-23679 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-23679?

CVE-2026-23679 affects Libusb. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-23679?

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

Does CVE-2026-23679 have an EU (EUVD) identifier?

Yes. CVE-2026-23679 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-32502.

When was CVE-2026-23679 published?

CVE-2026-23679 was published on 2026-05-27 and last updated on 2026-06-17.

CVE-2026-23679

CVE-2026-23679 is a medium-severity vulnerability in Libusb with a CVSS 3.x base score of 6.2. 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 6.2)
CVSS v4: 6.9
EPSS exploit prediction: 0% (8th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-32502
Weakness: CWE-125
Affected product: Libusb
Published: 2026-05-27
Last modified: 2026-06-17

Description

libusb before version 1.0.30 contains a NULL pointer dereference vulnerability that allows attackers to crash applications by supplying a malformed USB configuration descriptor where an interface claims bNumEndpoints greater than zero but is followed by a class-specific descriptor whose bLength exceeds the remaining buffer size, causing parse_interface() to return early without allocating the endpoint array. Attackers can exploit this flaw through libusb_get_active_config_descriptor or libusb_get_config_descriptor by providing crafted descriptors via virtualized USB passthrough, file-based descriptor parsing, or network sources, causing any application iterating over endpoints to dereference a NULL endpoint pointer and crash.

Frequently asked questions

What is CVE-2026-23679?: libusb before version 1.0.30 contains a NULL pointer dereference vulnerability that allows attackers to crash applications by supplying a malformed USB configuration descriptor where an interface claims bNumEndpoints greater than zero but is followed by a class-specific descriptor whose bLength exceeds the remaining buffer size, causing parse_interface() to return early without allocating the endpoint array. Attackers can exploit this flaw through libusb_get_active_config_descriptor or libusb_get_config_descriptor by providing crafted descriptors via virtualized USB passthrough, file-based descriptor parsing, or network sources, causing any application iterating over endpoints to dereference a NULL endpoint pointer and crash.
How severe is CVE-2026-23679?: CVE-2026-23679 has a CVSS 3.x base score of 6.2, 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 high.
Is CVE-2026-23679 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-23679?: CVE-2026-23679 affects Libusb. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-23679?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-23679 have an EU (EUVD) identifier?: Yes. CVE-2026-23679 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-32502.
When was CVE-2026-23679 published?: CVE-2026-23679 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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