CVE-2026-89554: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-9vj3-qjq5-h6jg
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CVSS 8.2
Published
Advisory Summary

CVE-2026-89554 is a HIGH (CVSS 8.2) security vulnerability vulnerability (General Security Weakness) affecting Software libraries in the Maven ecosystem. Remediation is available in the latest vendor maintenance releases.

CVE-2026-89554 at a Glance

CVE Identifier CVE-2026-89554
GHSA Identifier GHSA-9vj3-qjq5-h6jg
Severity HIGH
CVSS v3.1 Base Score 8.2
CWE Classification General Security Weakness
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 8.2

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:L/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 Low (I:L)
Availability High (A:H)

How to Fix CVE-2026-89554

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-2026-89554, 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: mptcp: fix uninitialized local_id in syncookie MP_JOIN reconstruction mptcp_token_join_cookie_init_state() restores remote_nonce, local_nonce, backup, join_id, token and msk from the saved cookie entry when rebuilding the request socket for a MP_JOIN 4th-ACK handled under SYN cookies, but it does not restore local_id, even though the SYN path saved it. subflow_ulp_clone() then reads that uninitialized field and stores it as the joined subflow's address-ID. Because the request-sock slab is SLAB_TYPESAFE_BY_RCU and not zeroed on allocation, the value is the stale byte of a previously freed request socket, which an off-path peer can influence by sending concurrent MP_JOIN SYNs. This corrupts the path manager's id-based subflow bookkeeping for the connection. Restore subflow_req->local_id from the cookie entry, as done for the other fields.

References

NVD — CVE-2026-89554 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-89554
git.kernel.org/stable/c/4534e0eead... WEB
https://git.kernel.org/stable/c/4534e0eead692bb069ad1e6a5a245fc2e2078300
git.kernel.org/stable/c/51887ccd88... WEB
https://git.kernel.org/stable/c/51887ccd88791ddaa8755a7c614fda031ecf7982
git.kernel.org/stable/c/63cacb05e5... WEB
https://git.kernel.org/stable/c/63cacb05e51a1c6e1349d2e593d00fd6ef43def4
git.kernel.org/stable/c/64f2c5dd49... WEB
https://git.kernel.org/stable/c/64f2c5dd49b956a542c8c02b8dad5d262a462bba
git.kernel.org/stable/c/954b5ea836... WEB
https://git.kernel.org/stable/c/954b5ea836eb118d188975ced803448537ab8479
git.kernel.org/stable/c/9df36a4846... WEB
https://git.kernel.org/stable/c/9df36a4846375a9b75bf42d77bfed216b0f366f9
git.kernel.org/stable/c/b878dfdd12... WEB
https://git.kernel.org/stable/c/b878dfdd12d7a5b8722a78d35e313506140ca3d9
git.kernel.org/stable/c/bf19d16633... WEB
https://git.kernel.org/stable/c/bf19d166337c6488b39cb03eeeffb30a941d6326

Frequently Asked Questions

What is CVE-2026-89554?
CVE-2026-89554 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-2026-89554?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-89554?
CVE-2026-89554 has a CVSS v3.1 base score of 8.2 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H.
What CWE is associated with CVE-2026-89554?
CVE-2026-89554 is classified under General Security Weakness.
How can I check Maven dependencies for CVE-2026-89554?
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-9vj3-qjq5-h6jg",
  "modified" : "2026-09-14T15:32:29Z",
  "published" : "2026-09-11T21:31:32Z",
  "aliases" : [ "CVE-2026-89554" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: fix uninitialized local_id in syncookie MP_JOIN reconstruction\n\nmptcp_token_join_cookie_init_state() restores remote_nonce, local_nonce,\nbackup, join_id, token and msk from the saved cookie entry when rebuilding\nthe request socket for a MP_JOIN 4th-ACK handled under SYN cookies, but it\ndoes not restore local_id, even though the SYN path saved it.\nsubflow_ulp_clone() then reads that uninitialized field and stores it as\nthe joined subflow's address-ID. Because the request-sock slab is\nSLAB_TYPESAFE_BY_RCU and not zeroed on allocation, the value is the stale\nbyte of a previously freed request socket, which an off-path peer can\ninfluence by sending concurrent MP_JOIN SYNs. This corrupts the path\nmanager's id-based subflow bookkeeping for the connection.\n\nRestore subflow_req->local_id from the cookie entry, as done for the other\nfields.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-89554"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/4534e0eead692bb069ad1e6a5a245fc2e2078300"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/51887ccd88791ddaa8755a7c614fda031ecf7982"
  }, {
    "type" : "WEB",
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    "type" : "WEB",
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  }, {
    "type" : "WEB",
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  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/9df36a4846375a9b75bf42d77bfed216b0f366f9"
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  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/bf19d166337c6488b39cb03eeeffb30a941d6326"
  } ],
  "database_specific" : {
    "cwe_ids" : [ ],
    "severity" : "HIGH",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-09-11T20:19:39Z"
  }
}