CVE-2026-63891: Software Security Vulnerability Vulnerability

UNKNOWN
Advisory Identifier: GHSA-67r4-fvhf-7vqf
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Advisory Summary

CVE-2026-63891 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-2026-63891 at a Glance

CVE Identifier CVE-2026-63891
GHSA Identifier GHSA-67r4-fvhf-7vqf
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-2026-63891

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-2026-63891, 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: thunderbolt: property: Cap recursion depth in __tb_property_parse_dir() A DIRECTORY entry's value field is used as the dir_offset for a recursive call into __tb_property_parse_dir() with no depth counter. A crafted peer that chains DIRECTORY entries into a back-reference loop drives the parser until the kernel stack is exhausted and the guard page fires. Any untrusted XDomain peer (cable, dock, in-line inspector, adjacent host) that reaches the PROPERTIES_REQUEST control-plane exchange can trigger this without authentication. Thread a depth counter through tb_property_parse() and __tb_property_parse_dir(), and reject blocks that exceed TB_PROPERTY_MAX_DEPTH = 8. That is comfortably larger than any observed legitimate XDomain layout. Operators who do not need XDomain host-to-host discovery can disable the path entirely with thunderbolt.xdomain=0 on the kernel command line.

References

NVD — CVE-2026-63891 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-63891
git.kernel.org/stable/c/0a84ab9271... WEB
https://git.kernel.org/stable/c/0a84ab9271936c11e84e511bb52fc5682f8b6726
git.kernel.org/stable/c/2b5f47a710... WEB
https://git.kernel.org/stable/c/2b5f47a710172c962ef42d1b732b04d2ad0dce21
git.kernel.org/stable/c/830c8a9b46... WEB
https://git.kernel.org/stable/c/830c8a9b467e7d3a158483d37fa7dc13892b293a
git.kernel.org/stable/c/928abe19fb... WEB
https://git.kernel.org/stable/c/928abe19fbf0127003abcb1ea69cabc1c897d0ab
git.kernel.org/stable/c/95839a67ea... WEB
https://git.kernel.org/stable/c/95839a67ea56ca35732aad7f711404a3127cfe2d
git.kernel.org/stable/c/b4621e5ef6... WEB
https://git.kernel.org/stable/c/b4621e5ef63405c317a84b711faf3bd75b3c6a94
git.kernel.org/stable/c/ed9455ef4b... WEB
https://git.kernel.org/stable/c/ed9455ef4bd9babc90f92e526abe3fb68c1a8709
git.kernel.org/stable/c/f31c6d220f... WEB
https://git.kernel.org/stable/c/f31c6d220f455b5af63590302b30e1b932d14599

Frequently Asked Questions

What is CVE-2026-63891?
CVE-2026-63891 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-2026-63891?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What CWE is associated with CVE-2026-63891?
CVE-2026-63891 is classified under General Security Weakness.
How can I check Maven dependencies for CVE-2026-63891?
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-67r4-fvhf-7vqf",
  "modified" : "2026-07-19T18:31:44Z",
  "published" : "2026-07-19T18:31:44Z",
  "aliases" : [ "CVE-2026-63891" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nthunderbolt: property: Cap recursion depth in __tb_property_parse_dir()\n\nA DIRECTORY entry's value field is used as the dir_offset for a\nrecursive call into __tb_property_parse_dir() with no depth counter.\nA crafted peer that chains DIRECTORY entries into a back-reference\nloop drives the parser until the kernel stack is exhausted and the\nguard page fires.  Any untrusted XDomain peer (cable, dock, in-line\ninspector, adjacent host) that reaches the PROPERTIES_REQUEST\ncontrol-plane exchange can trigger this without authentication.\n\nThread a depth counter through tb_property_parse() and\n__tb_property_parse_dir(), and reject blocks that exceed\nTB_PROPERTY_MAX_DEPTH = 8.  That is comfortably larger than any\nobserved legitimate XDomain layout.\n\nOperators who do not need XDomain host-to-host discovery can disable\nthe path entirely with thunderbolt.xdomain=0 on the kernel command\nline.",
  "severity" : [ ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-63891"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/0a84ab9271936c11e84e511bb52fc5682f8b6726"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/2b5f47a710172c962ef42d1b732b04d2ad0dce21"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/830c8a9b467e7d3a158483d37fa7dc13892b293a"
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  "database_specific" : {
    "cwe_ids" : [ ],
    "severity" : null,
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-07-19T16:17:06Z"
  }
}