CVE-2026-63946: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-9g79-vcq4-5rfr
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CVSS 8.8
CWE-416
Published
Advisory Summary

CVE-2026-63946 is a HIGH (CVSS 8.8) security vulnerability vulnerability (CWE-416: Use After Free) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product reuses or references memory after it has been freed. at some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-63946 at a Glance

CVE Identifier CVE-2026-63946
GHSA Identifier GHSA-9g79-vcq4-5rfr
Severity HIGH
CVSS v3.1 Base Score 8.8
CWE Classification CWE-416: Use After Free
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 8.8

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

Attack Vector Adjacent (AV:A)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2026-63946

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-2026-63946, 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 CWE-416: Use After Free, where the product reuses or references memory after it has been freed. at some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer. 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: Bluetooth: ISO: fix UAF in iso_recv_frame iso_recv_frame reads conn->sk under iso_conn_lock but releases the lock before using sk, with no reference held. A concurrent iso_sock_kill() can free sk in that window, causing use-after-free on sk->sk_state and sock_queue_rcv_skb(). Fix by replacing the bare pointer read with iso_sock_hold(conn), which calls sock_hold() while the spinlock is held, atomically elevating the refcount before the lock drops. Add a drop_put label so sock_put() is called on all exit paths where the hold succeeded.

References

NVD — CVE-2026-63946 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-63946
git.kernel.org/stable/c/119fb6f80c... WEB
https://git.kernel.org/stable/c/119fb6f80c44dc1c65d604cf28e64c56bd9b6568
git.kernel.org/stable/c/1a6b803b00... WEB
https://git.kernel.org/stable/c/1a6b803b00ccdd7666506adbe01ddae1c72d1ca9
git.kernel.org/stable/c/47f23a2595... WEB
https://git.kernel.org/stable/c/47f23a259517abbdb8032c057a1e8a6bf3734878
git.kernel.org/stable/c/b04ec13132... WEB
https://git.kernel.org/stable/c/b04ec131325baf4ea4577d6c6e6b86cf092e3731
git.kernel.org/stable/c/c318aa5183... WEB
https://git.kernel.org/stable/c/c318aa51830a3d2cc1229968fe521441c97356cd
git.kernel.org/stable/c/c57ea90f20... WEB
https://git.kernel.org/stable/c/c57ea90f203c8b8b41a474f19a09000d0f841436

Frequently Asked Questions

What is CVE-2026-63946?
CVE-2026-63946 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-416: Use After Free.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-63946?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-63946?
CVE-2026-63946 has a CVSS v3.1 base score of 8.8 (HIGH) with vector string CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2026-63946?
CVE-2026-63946 is classified under CWE-416: Use After Free (The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.).
How can I check Maven dependencies for CVE-2026-63946?
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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  "id" : "GHSA-9g79-vcq4-5rfr",
  "modified" : "2026-07-20T15:31:53Z",
  "published" : "2026-07-19T18:31:47Z",
  "aliases" : [ "CVE-2026-63946" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: ISO: fix UAF in iso_recv_frame\n\niso_recv_frame reads conn->sk under iso_conn_lock but releases the lock\nbefore using sk, with no reference held. A concurrent iso_sock_kill()\ncan free sk in that window, causing use-after-free on sk->sk_state and\nsock_queue_rcv_skb().\n\nFix by replacing the bare pointer read with iso_sock_hold(conn), which\ncalls sock_hold() while the spinlock is held, atomically elevating the\nrefcount before the lock drops. Add a drop_put label so sock_put() is\ncalled on all exit paths where the hold succeeded.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
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