CVE-2026-23679

Name: CVE-2026-23679
Creator: NVD / NIST
Published: 2026-05-27T14:16:44.17+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.9/10EPSS 0.18%

Last modified Jun 17, 2026

CVE-2026-23679 is a medium-severity vulnerability rated 6.9/10 on the CVSS scale. 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.. EPSS estimates a 0.18% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.5/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS 4.0

6.9/10

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability

0.18%

8.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-125

Affected Software

Vendor	Product	Versions
Libusb	Libusb	< 1.0.30

References

https://github.com/libusb/libusb/commit/578ab76b4c434f8b204137ab6d7310689c7a9704Patch
https://github.com/libusb/libusb/issues/1813Issue Tracking, Mitigation
https://github.com/libusb/libusb/pull/1814Issue Tracking, Patch
https://github.com/libusb/libusb/releases/tag/v1.0.30Product, Release Notes
https://www.vulncheck.com/advisories/libusb-null-pointer-dereference-in-parse-interfacePatch, Third Party Advisory
https://github.com/libusb/libusb/issues/1813Issue Tracking, Mitigation

Timeline

Published: May 27, 2026
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2026-23679?

How severe is CVE-2026-23679?

CVE-2026-23679 has a CVSS score of 6.9/10 (MEDIUM severity). The EPSS model estimates a 0.18% probability of exploitation in the next 30 days.

How do I fix CVE-2026-23679?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-23679?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST