CVE-2026-63968: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-c2hg-pgqh-6wp2
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CVSS 7.5
CWE-835
Published
Advisory Summary

CVE-2026-63968 is a HIGH (CVSS 7.5) security vulnerability vulnerability (CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop')) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-63968 at a Glance

CVE Identifier CVE-2026-63968
GHSA Identifier GHSA-c2hg-pgqh-6wp2
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop')
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 7.5

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

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

How to Fix CVE-2026-63968

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-2026-63968, 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-835: Loop with Unreachable Exit Condition ('Infinite Loop'), where the product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop. 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: ipv6: fix possible infinite loop in fib6_select_path() Found while auditing the same pattern Sashiko reported in rt6_fill_node() [1]. Apply the same fix as commit f8d8ce1b515a ("ipv6: fix possible infinite loop in fib6_info_uses_dev()"). Writers holding tb6_lock can list_del_rcu(&first->fib6_siblings) without waiting for RCU readers; first->fib6_siblings.next then still points into the old ring and this softirq-side walker never reaches &first->fib6_siblings as its terminator. fib6_purge_rt() always WRITE_ONCE()s first->fib6_nsiblings to 0 before list_del_rcu(), so an inside-loop check is a reliable detach signal. [1] https://sashiko.dev/#/patchset/20260526020227.4857-1-jiayuan.chen%40linux.dev

References

NVD — CVE-2026-63968 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-63968
git.kernel.org/stable/c/0f7b73c345... WEB
https://git.kernel.org/stable/c/0f7b73c3452635de83b8711b31abdda8e49aad7b
git.kernel.org/stable/c/3948a7d92f... WEB
https://git.kernel.org/stable/c/3948a7d92f7678e89e1776bb2d169afcad63b1ae
git.kernel.org/stable/c/9b9d5bd6e3... WEB
https://git.kernel.org/stable/c/9b9d5bd6e3d4c9cecab5407604b690684b2532d2
git.kernel.org/stable/c/9c7da87c2d... WEB
https://git.kernel.org/stable/c/9c7da87c2dc860bb17ca1ece942495d28b1ce3b9
git.kernel.org/stable/c/ab9a10969a... WEB
https://git.kernel.org/stable/c/ab9a10969a907b472a0196d999c08ff7144172e3
git.kernel.org/stable/c/c87cd3cb30... WEB
https://git.kernel.org/stable/c/c87cd3cb309634bc8f50a54e2079424f219ac21f

Frequently Asked Questions

What is CVE-2026-63968?
CVE-2026-63968 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop').
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-63968?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-63968?
CVE-2026-63968 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2026-63968?
CVE-2026-63968 is classified under CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop') (The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop.).
How can I check Maven dependencies for CVE-2026-63968?
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-c2hg-pgqh-6wp2",
  "modified" : "2026-07-20T15:31:53Z",
  "published" : "2026-07-19T18:31:47Z",
  "aliases" : [ "CVE-2026-63968" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: fix possible infinite loop in fib6_select_path()\n\nFound while auditing the same pattern Sashiko reported in\nrt6_fill_node() [1]. Apply the same fix as\ncommit f8d8ce1b515a (\"ipv6: fix possible infinite loop in fib6_info_uses_dev()\").\n\nWriters holding tb6_lock can list_del_rcu(&first->fib6_siblings)\nwithout waiting for RCU readers; first->fib6_siblings.next then\nstill points into the old ring and this softirq-side walker never\nreaches &first->fib6_siblings as its terminator. fib6_purge_rt()\nalways WRITE_ONCE()s first->fib6_nsiblings to 0 before\nlist_del_rcu(), so an inside-loop check is a reliable detach signal.\n\n[1] https://sashiko.dev/#/patchset/20260526020227.4857-1-jiayuan.chen%40linux.dev",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-63968"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/0f7b73c3452635de83b8711b31abdda8e49aad7b"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/3948a7d92f7678e89e1776bb2d169afcad63b1ae"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/9b9d5bd6e3d4c9cecab5407604b690684b2532d2"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/9c7da87c2dc860bb17ca1ece942495d28b1ce3b9"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/ab9a10969a907b472a0196d999c08ff7144172e3"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/c87cd3cb309634bc8f50a54e2079424f219ac21f"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-835" ],
    "severity" : "HIGH",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-07-19T16:17:15Z"
  }
}