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Fencer Vulns
medium 6.2

CVE-2026-23679 json

libusb < 1.0.30 NULL Pointer Dereference in parse_interface()

published 2026-05-27 5 mo ago modified 2026-11-08 20 h ago also EUVD-2026-32502 , GHSA-jp69-qvgm-mqwx , JLSEC-2026-665 , PYSEC-2026-3978

cvss
6.2
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 8%
public exploits
0
none known

Summary

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.

Patch / fix

  • julia libusb_jll 1.0.30+0
  • pypi libusb 1.0.30
  • libusb libusb 1.0.30
  • libusb-1.0 Debian 14 2:1.0.30-1

debian advisories DEBIAN-CVE-2026-23679

  • libusb1 hummingbird 1 1.0.30-1.hum1
  • mingw32-libusb1 hummingbird 1 1.0.30-1.hum1
  • mingw64-libusb1 hummingbird 1 1.0.30-1.hum1
  • libusb1-tests-examples hummingbird 1 1.0.30-1.hum1

red hat advisories RHSA-2026:20075

  • libusb-1_0 SLE Module for Package Hub 15 SP7, SLE Module for Basesystem 15 SP7, SLE Micro 5.5 +2 more 1.0.24-150400.3.6.1
  • libusb-1_0 SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 1.0.28-160000.3.1
  • libusb-1_0 Linux Micro 6.1 1.0.27-slfo.1.1_2.1
  • libusb-1_0 Linux Micro 6.0 1.0.27-2.1
  • libusb-1_0 SLES LTSS Extended Security 12 SP5 1.0.20-7.3.1

suse advisories SUSE-SU-2026:4080-1SUSE-SU-2026:4050-1SUSE-SU-2026:23501-1SUSE-SU-2026:23644-1SUSE-SU-2026:23660-1SUSE-SU-2026:23519-1

  • libusb-1_0 openSUSE Leap 16.0 1.0.28-160000.3.1

opensuse advisories openSUSE-SU-2026:21783-1

  • libusb Azure Linux 3.0 1.0.30-1

azure linux advisories AZL-88791

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-23679 updated cvss 6.2

libusb: libusb: Denial of Service via malformed USB configuration descriptor

  • Red Hat Enterprise Linux 6 libusb, libusb1 Red Hat Enterprise Linux 7 libusb
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 libusb Red Hat Enterprise Linux 9 libusb Red Hat Enterprise Linux 10 libusb1
    affected: no fix available “Fix deferred”
  • Red Hat Hardened Images libusb1 1.0.30-1.hum1, mingw32-libusb1 1.0.30-1.hum1, mingw64-libusb1 1.0.30-1.hum1, libusb1-tests-examples 1.0.30-1.hum1
    fixed: vendor fix RHSA-2026:20075

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
5 mo ago

Exploit prediction

0.18% chance of exploitation in the next 30 days, higher than 8% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/libusb/libusb/issues/1813 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 4.0 6.9 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
CNA 3.1 6.2 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 4.0 6.9 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
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
OSV 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
julia libusb_jll
<1.0.30+0
1.0.30+0
pypi libusb
<1.0.30
1.0.30

Affected products

  • libusb libusb

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.