CVE-2026-63942: Software Security Vulnerability Vulnerability
HIGHCVE-2026-63942 is a HIGH (CVSS 7.8) security vulnerability vulnerability (CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.. Remediation is available in the latest vendor maintenance releases.
CVE-2026-63942 at a Glance
Security Impact
CVSS: 7.8
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).
How to Fix CVE-2026-63942
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.
Run the following command in your project directory to verify that all resolved dependencies use the patched release:
mvn dependency:treeHow to Check if You Are Affected
To determine whether your Java application is affected by CVE-2026-63942, inspect your build dependencies using the Maven Dependency Plugin:
mvn dependency:treeAnalyze 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 CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition'), where the product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently. 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
References
Frequently Asked Questions
What is CVE-2026-63942?
Which Software versions are affected?
What version fixes CVE-2026-63942?
What is the CVSS score of CVE-2026-63942?
What CWE is associated with CVE-2026-63942?
How can I check Maven dependencies for CVE-2026-63942?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-g8r4-rq83-8vj2",
"modified" : "2026-07-20T15:31:52Z",
"published" : "2026-07-19T18:31:47Z",
"aliases" : [ "CVE-2026-63942" ],
"details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nparport: Fix race between port and client registration\n\nThe parport subsystem registers port devices before they are fully\ninitialised, resulting in a race condition where client drivers such\nas lp can attach to ports that are not completely initialised or even\nbeing torn down.\n\nWhen the port and client drivers are built as modules and loaded\naround the same time during boot, this occasionally results in a\ncrash. I was able to make this happen reliably in a VM with a\nPC-style parallel port by patching parport_pc to fail probing:\n\n> --- a/drivers/parport/parport_pc.c\n> +++ b/drivers/parport/parport_pc.c\n> @@ -2069,7 +2069,7 @@ static struct parport *__parport_pc_probe_port(unsigned long int base,\n> \tif (!p)\n> \t\tgoto out3;\n>\n> -\tbase_res = request_region(base, 3, p->name);\n> +\tbase_res = NULL;\n> \tif (!base_res)\n> \t\tgoto out4;\n>\n\nand then running:\n\n while true; do\n modprobe lp & modprobe parport_pc\n\twait\n\trmmod lp parport_pc\n done\n\nfor a few seconds.\n\nIn the long term I think port registration should be changed to put\nthe call to device_add() inside parport_announce_port(), but since the\nlatter currently cannot fail this will require changing all port\ndrivers.\n\nFor now, add a flag to indicate whether a port has been \"announced\"\nand only try to attach client drivers to ports when the flag is set.",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
} ],
"affected" : [ ],
"references" : [ {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-63942"
}, {
"type" : "WEB",
"url" : "https://git.kernel.org/stable/c/15b1723c1472e802f9f7e69ae4e64f7dbf588848"
}, {
"type" : "WEB",
"url" : "https://git.kernel.org/stable/c/290f515c5e3b3900bc2fe24f179999fd08d23bfa"
}, {
"type" : "WEB",
"url" : "https://git.kernel.org/stable/c/51026cff1f4f3b762a0b5a07c727bd59cef45320"
}, {
"type" : "WEB",
"url" : "https://git.kernel.org/stable/c/74d6aae1df45d3414178986be743f946988fddf6"
}, {
"type" : "WEB",
"url" : "https://git.kernel.org/stable/c/a1e81b58da0179531bedf0b9f2811f5f992d5c4b"
}, {
"type" : "WEB",
"url" : "https://git.kernel.org/stable/c/d16548be2ea5058227d79799e81dab61c9bca8ec"
}, {
"type" : "WEB",
"url" : "https://git.kernel.org/stable/c/ef15ccbb3e8640a723c42ad90eaf81d66ae02017"
}, {
"type" : "WEB",
"url" : "https://git.kernel.org/stable/c/f3378b0d7bd4605de89b083b2900788157a181cc"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-362" ],
"severity" : "HIGH",
"github_reviewed" : false,
"github_reviewed_at" : null,
"nvd_published_at" : "2026-07-19T16:17:12Z"
}
}