CVE-2026-63964: Software Security Vulnerability Vulnerability

UNKNOWN
Advisory Identifier: GHSA-7w55-p3p4-26mv
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Advisory Summary

CVE-2026-63964 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-2026-63964 at a Glance

CVE Identifier CVE-2026-63964
GHSA Identifier GHSA-7w55-p3p4-26mv
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-2026-63964

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-2026-63964, 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: typec: ucsi: ccg: reject firmware images without a ':' record header do_flash() locates the first .cyacd record with p = strnchr(fw->data, fw->size, ':'); while (p < eof) { s = strnchr(p + 1, eof - p - 1, ':'); ... } If the firmware image contains no ':' byte, strnchr() returns NULL. NULL compares less than the valid kernel pointer eof, so the loop body runs and strnchr() is called with p + 1 == (void *)1 and a length of roughly (unsigned long)eof, causing a wonderful crash. The not_signed_fw fallthrough earlier in do_flash() and the chip-state branches in ccg_fw_update_needed() allow an unsigned blob to reach this loop, so a root user who can place a crafted file under /lib/firmware and write the do_flash sysfs attribute can trigger the oops. Bail out with -EINVAL when the initial strnchr() returns NULL.

References

NVD — CVE-2026-63964 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-63964
git.kernel.org/stable/c/2f395ca126... WEB
https://git.kernel.org/stable/c/2f395ca1263bd181995eb829f5943a83a20db213
git.kernel.org/stable/c/3f432b8203... WEB
https://git.kernel.org/stable/c/3f432b8203066c26770fe6ea591361f10021dd6b
git.kernel.org/stable/c/6526f8684f... WEB
https://git.kernel.org/stable/c/6526f8684f72391138353642af908803ba70795e
git.kernel.org/stable/c/a38ed87818... WEB
https://git.kernel.org/stable/c/a38ed87818b2419090fb1a6338ddce6842b65dfa
git.kernel.org/stable/c/b41dfc033f... WEB
https://git.kernel.org/stable/c/b41dfc033fe594e152648050e95b9489cd53e9e3
git.kernel.org/stable/c/c4ee519b06... WEB
https://git.kernel.org/stable/c/c4ee519b06389e59ba2d6aa722fcc4a02a8bbcbb
git.kernel.org/stable/c/c8460de584... WEB
https://git.kernel.org/stable/c/c8460de584fe5415d212cfdd127d4db90835a450
git.kernel.org/stable/c/d7486952bf... WEB
https://git.kernel.org/stable/c/d7486952bf74e546ee3748fb14b2d07881fa6273

Frequently Asked Questions

What is CVE-2026-63964?
CVE-2026-63964 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-2026-63964?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What CWE is associated with CVE-2026-63964?
CVE-2026-63964 is classified under General Security Weakness.
How can I check Maven dependencies for CVE-2026-63964?
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 
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  "schema_version" : "1.4.0",
  "id" : "GHSA-7w55-p3p4-26mv",
  "modified" : "2026-07-19T18:31:48Z",
  "published" : "2026-07-19T18:31:47Z",
  "aliases" : [ "CVE-2026-63964" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: typec: ucsi: ccg: reject firmware images without a ':' record header\n\ndo_flash() locates the first .cyacd record with\n\n\tp = strnchr(fw->data, fw->size, ':');\n\twhile (p < eof) {\n\t\ts = strnchr(p + 1, eof - p - 1, ':');\n\t\t...\n\t}\n\nIf the firmware image contains no ':' byte,  strnchr() returns NULL.\nNULL compares less than the valid kernel pointer eof, so the loop body\nruns and strnchr() is called with p + 1 == (void *)1 and a length of\nroughly (unsigned long)eof, causing a wonderful crash.\n\nThe not_signed_fw fallthrough earlier in do_flash() and the chip-state\nbranches in ccg_fw_update_needed() allow an unsigned blob to reach this\nloop, so a root user who can place a crafted file under /lib/firmware\nand write the do_flash sysfs attribute can trigger the oops.\n\nBail out with -EINVAL when the initial strnchr() returns NULL.",
  "severity" : [ ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-63964"
  }, {
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    "url" : "https://git.kernel.org/stable/c/2f395ca1263bd181995eb829f5943a83a20db213"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/3f432b8203066c26770fe6ea591361f10021dd6b"
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    "url" : "https://git.kernel.org/stable/c/d7486952bf74e546ee3748fb14b2d07881fa6273"
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  "database_specific" : {
    "cwe_ids" : [ ],
    "severity" : null,
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-07-19T16:17:15Z"
  }
}