CVE-2026-63896: Software Security Vulnerability Vulnerability

UNKNOWN
Advisory Identifier: GHSA-5hvq-fg66-prgg
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Advisory Summary

CVE-2026-63896 is a security vulnerability vulnerability (General Security Weakness) affecting Software libraries in the Maven ecosystem. Remediation is available in the latest vendor maintenance releases.

CVE-2026-63896 at a Glance

CVE Identifier CVE-2026-63896
GHSA Identifier GHSA-5hvq-fg66-prgg
Severity N/A
CVSS v3.1 Base Score N/A
CWE Classification General Security Weakness
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

How to Fix CVE-2026-63896

To remediate this vulnerability, upgrade all affected Software dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-63896, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree

Analyze the terminal output to locate any version of Software in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: The mvn dependency:tree command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under General Security Weakness. In Software, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

In the Linux kernel, the following vulnerability has been resolved: usb: gadget: composite: fix integer underflow in WebUSB GET_URL handling The WebUSB GET_URL handler in composite_setup() narrows landing_page_length to fit the host-supplied wLength using landing_page_length = w_length - WEBUSB_URL_DESCRIPTOR_HEADER_LENGTH + landing_page_offset; If wLength is smaller than WEBUSB_URL_DESCRIPTOR_HEADER_LENGTH the unsigned subtraction wraps, and the subsequent memcpy(url_descriptor->URL, cdev->landing_page + landing_page_offset, landing_page_length - landing_page_offset); ends up copying close to UINT_MAX bytes from cdev->landing_page into cdev->req->buf. KASAN reports a slab-out-of-bounds in composite_setup on the kmalloc-2k gadget_info allocation, and FORTIFY_SOURCE traps the memcpy as a 4294967293-byte field-spanning write into url_descriptor->URL (size 252). A USB host can reach this from a single SETUP packet against any gadget that has webusb/use=1 and a landingPage configured. Handle the small-wLength case before the math: when the host requested fewer bytes than the URL descriptor header, only the header is meaningful and no URL bytes need to be copied. Setting landing_page_length to landing_page_offset makes the existing memcpy a no-op and leaves the descriptor returned to the host unchanged for all larger wLength values.

References

NVD — CVE-2026-63896 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-63896
git.kernel.org/stable/c/046870ff6b... WEB
https://git.kernel.org/stable/c/046870ff6b6f7b743c953c061043a9b30700d491
git.kernel.org/stable/c/6c5dbc104d... WEB
https://git.kernel.org/stable/c/6c5dbc104dadd79fc2923497c20bae759a18758c
git.kernel.org/stable/c/a20f0ccf45... WEB
https://git.kernel.org/stable/c/a20f0ccf45708af6e063c7234c215d364b00de25
git.kernel.org/stable/c/f5869dfaa8... WEB
https://git.kernel.org/stable/c/f5869dfaa89854dcf34121036294d42d6c7acb8f
git.kernel.org/stable/c/f8f5a8f48c... WEB
https://git.kernel.org/stable/c/f8f5a8f48c7cae3fac85e04b593bd47939f9725f

Frequently Asked Questions

What is CVE-2026-63896?
CVE-2026-63896 is a security vulnerability in Software classified as a security vulnerability vulnerability under General Security Weakness.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-63896?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What CWE is associated with CVE-2026-63896?
CVE-2026-63896 is classified under General Security Weakness.
How can I check Maven dependencies for CVE-2026-63896?
Run the dependency tree command: 'mvn dependency:tree'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-5hvq-fg66-prgg",
  "modified" : "2026-07-19T18:31:44Z",
  "published" : "2026-07-19T18:31:44Z",
  "aliases" : [ "CVE-2026-63896" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: composite: fix integer underflow in WebUSB GET_URL handling\n\nThe WebUSB GET_URL handler in composite_setup() narrows\nlanding_page_length to fit the host-supplied wLength using\n\n\tlanding_page_length = w_length\n\t\t- WEBUSB_URL_DESCRIPTOR_HEADER_LENGTH + landing_page_offset;\n\nIf wLength is smaller than WEBUSB_URL_DESCRIPTOR_HEADER_LENGTH the\nunsigned subtraction wraps, and the subsequent\n\n\tmemcpy(url_descriptor->URL,\n\t       cdev->landing_page + landing_page_offset,\n\t       landing_page_length - landing_page_offset);\n\nends up copying close to UINT_MAX bytes from cdev->landing_page into\ncdev->req->buf.  KASAN reports a slab-out-of-bounds in composite_setup\non the kmalloc-2k gadget_info allocation, and FORTIFY_SOURCE traps the\nmemcpy as a 4294967293-byte field-spanning write into\nurl_descriptor->URL (size 252).\n\nA USB host can reach this from a single SETUP packet against any\ngadget that has webusb/use=1 and a landingPage configured.\n\nHandle the small-wLength case before the math: when the host requested\nfewer bytes than the URL descriptor header, only the header is\nmeaningful and no URL bytes need to be copied.  Setting\nlanding_page_length to landing_page_offset makes the existing memcpy a\nno-op and leaves the descriptor returned to the host unchanged for all\nlarger wLength values.",
  "severity" : [ ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-63896"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/046870ff6b6f7b743c953c061043a9b30700d491"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/6c5dbc104dadd79fc2923497c20bae759a18758c"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/a20f0ccf45708af6e063c7234c215d364b00de25"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/f5869dfaa89854dcf34121036294d42d6c7acb8f"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/f8f5a8f48c7cae3fac85e04b593bd47939f9725f"
  } ],
  "database_specific" : {
    "cwe_ids" : [ ],
    "severity" : null,
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-07-19T16:17:07Z"
  }
}