CVE-2026-89634: Software Security Vulnerability Vulnerability

CRITICAL
Advisory Identifier: GHSA-959h-4fxq-gqhj
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CVSS 9.1
Published
Advisory Summary

CVE-2026-89634 is a CRITICAL (CVSS 9.1) security vulnerability vulnerability (General Security Weakness) affecting Software libraries in the Maven ecosystem. Remediation is available in the latest vendor maintenance releases.

CVE-2026-89634 at a Glance

CVE Identifier CVE-2026-89634
GHSA Identifier GHSA-959h-4fxq-gqhj
Severity CRITICAL
CVSS v3.1 Base Score 9.1
CWE Classification General Security Weakness
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 9.1

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:H/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 High (C:H)
Integrity None (I:N)
Availability High (A:H)

How to Fix CVE-2026-89634

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-2026-89634, 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: smb: client: fix ALIGN() overflow in symlink_data() error context loop The check added by commit 7d9a7f1f96cd ("smb/client: fix possible infinite loop and oob read in symlink_data()") compared the post-ALIGN length against the remaining buffer, but ALIGN() itself can overflow: for ErrorDataLength near UINT32_MAX (e.g. 0xFFFFFFF9), ALIGN(x, 8) wraps to 0, so the subsequent bounds check passes, and the loop advances by zero bytes leaving 'p' pointing into stale data. Fix by checking the raw ErrorDataLength against the remaining space before applying ALIGN(), then checking again after. Since raw_len is bounded by the buffer, raw_len + 7 cannot overflow, so the second check is an exact post-alignment bounds guard.

References

NVD — CVE-2026-89634 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-89634
git.kernel.org/stable/c/1f824f61d1... WEB
https://git.kernel.org/stable/c/1f824f61d1df52392eaf0b74dfa5659d724fde30
git.kernel.org/stable/c/2b4a25baa0... WEB
https://git.kernel.org/stable/c/2b4a25baa0b936fef6915c0459925077b324ecaf
git.kernel.org/stable/c/62656b024e... WEB
https://git.kernel.org/stable/c/62656b024efc21c3230eade1a847f25871c3d2bb
git.kernel.org/stable/c/62a3025983... WEB
https://git.kernel.org/stable/c/62a3025983c8c735a3c6fc85a59316f31b59af07
git.kernel.org/stable/c/657372ba6e... WEB
https://git.kernel.org/stable/c/657372ba6ea50b4474d2a6a610097eae8cd1f3e9
git.kernel.org/stable/c/b89d678f9e... WEB
https://git.kernel.org/stable/c/b89d678f9eafcf8d74885983166ba26b40a04ea0

Frequently Asked Questions

What is CVE-2026-89634?
CVE-2026-89634 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-2026-89634?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-89634?
CVE-2026-89634 has a CVSS v3.1 base score of 9.1 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H.
What CWE is associated with CVE-2026-89634?
CVE-2026-89634 is classified under General Security Weakness.
How can I check Maven dependencies for CVE-2026-89634?
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-959h-4fxq-gqhj",
  "modified" : "2026-09-14T15:32:32Z",
  "published" : "2026-09-11T21:31:34Z",
  "aliases" : [ "CVE-2026-89634" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix ALIGN() overflow in symlink_data() error context loop\n\nThe check added by commit 7d9a7f1f96cd (\"smb/client: fix possible\ninfinite loop and oob read in symlink_data()\") compared the post-ALIGN\nlength against the remaining buffer, but ALIGN() itself can overflow:\nfor ErrorDataLength near UINT32_MAX (e.g. 0xFFFFFFF9), ALIGN(x, 8)\nwraps to 0, so the subsequent bounds check passes, and the loop\nadvances by zero bytes leaving 'p' pointing into stale data.\n\nFix by checking the raw ErrorDataLength against the remaining space\nbefore applying ALIGN(), then checking again after.  Since raw_len is\nbounded by the buffer, raw_len + 7 cannot overflow, so the second check\nis an exact post-alignment bounds guard.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-89634"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/1f824f61d1df52392eaf0b74dfa5659d724fde30"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/2b4a25baa0b936fef6915c0459925077b324ecaf"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/62656b024efc21c3230eade1a847f25871c3d2bb"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/62a3025983c8c735a3c6fc85a59316f31b59af07"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/657372ba6ea50b4474d2a6a610097eae8cd1f3e9"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/b89d678f9eafcf8d74885983166ba26b40a04ea0"
  } ],
  "database_specific" : {
    "cwe_ids" : [ ],
    "severity" : "CRITICAL",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-09-11T20:19:49Z"
  }
}