CVE-2026-89674: Software Security Vulnerability Vulnerability

CRITICAL
Advisory Identifier: GHSA-qhmp-vm7x-v422
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CVSS 9.8
Published
Advisory Summary

CVE-2026-89674 is a CRITICAL (CVSS 9.8) security vulnerability vulnerability (General Security Weakness) affecting Software libraries in the Maven ecosystem. Remediation is available in the latest vendor maintenance releases.

CVE-2026-89674 at a Glance

CVE Identifier CVE-2026-89674
GHSA Identifier GHSA-qhmp-vm7x-v422
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification General Security Weakness
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 9.8

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

How to Fix CVE-2026-89674

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-2026-89674, 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: nfsd: fix XDR length calculation in nfsd4_ff_encode_layoutget The XDR buffer size calculation in nfsd4_ff_encode_layoutget() has multiple errors that can result in either an out-of-bounds write or leaking uninitialized kernel memory to the client: - fh_len doesn't account for XDR padding on the file handle data - uid and gid lengths use "8 + len" but xdr_encode_opaque() actually writes "4 + xdr_align_size(len)" bytes - ds_len omits the flags and stats_collect_hint fields (8 bytes), while len's header constant overestimates by 8 bytes -- these partially cancel but leave a net mismatch The worst case occurs with short strings (e.g. uid=0, gid=0 with an odd-sized file handle), where the function writes up to 5 bytes past the reserved XDR buffer. Conversely, when string lengths happen to be 4-byte aligned, the reservation is too large and stale buffer content is sent to the client. Fix this by breaking out every encoded field explicitly in the ds_len calculation, using xdr_align_size() for all variable-length opaque fields, and correcting the header constants.

References

NVD — CVE-2026-89674 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-89674
git.kernel.org/stable/c/0380129b13... WEB
https://git.kernel.org/stable/c/0380129b1373c437eb35401a174671c8888f4b80
git.kernel.org/stable/c/29e4478e2e... WEB
https://git.kernel.org/stable/c/29e4478e2ed5a227e8f0c33cacb91bf227cedd47
git.kernel.org/stable/c/3a7fd224df... WEB
https://git.kernel.org/stable/c/3a7fd224df0fbb42167eb1b77be45d72fe0b1098
git.kernel.org/stable/c/65a72b7219... WEB
https://git.kernel.org/stable/c/65a72b721943618eeb3a41c8b36e915591f3f83f
git.kernel.org/stable/c/bee826c00a... WEB
https://git.kernel.org/stable/c/bee826c00ac900473f91306f1f3e5a5a81fd4a74
git.kernel.org/stable/c/c81cef6a80... WEB
https://git.kernel.org/stable/c/c81cef6a805dec266c10fc4f83c93d6fcf1a2b43
git.kernel.org/stable/c/e7d9d23ecd... WEB
https://git.kernel.org/stable/c/e7d9d23ecd9172f05b09bb678ff22db8e361c428
git.kernel.org/stable/c/f9868174af... WEB
https://git.kernel.org/stable/c/f9868174af49d207fbaf0c5e055d088a983684af

Frequently Asked Questions

What is CVE-2026-89674?
CVE-2026-89674 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-2026-89674?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-89674?
CVE-2026-89674 has a CVSS v3.1 base score of 9.8 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2026-89674?
CVE-2026-89674 is classified under General Security Weakness.
How can I check Maven dependencies for CVE-2026-89674?
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-qhmp-vm7x-v422",
  "modified" : "2026-09-14T15:32:34Z",
  "published" : "2026-09-11T21:31:36Z",
  "aliases" : [ "CVE-2026-89674" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: fix XDR length calculation in nfsd4_ff_encode_layoutget\n\nThe XDR buffer size calculation in nfsd4_ff_encode_layoutget() has\nmultiple errors that can result in either an out-of-bounds write or\nleaking uninitialized kernel memory to the client:\n\n - fh_len doesn't account for XDR padding on the file handle data\n - uid and gid lengths use \"8 + len\" but xdr_encode_opaque() actually\n   writes \"4 + xdr_align_size(len)\" bytes\n - ds_len omits the flags and stats_collect_hint fields (8 bytes),\n   while len's header constant overestimates by 8 bytes -- these\n   partially cancel but leave a net mismatch\n\nThe worst case occurs with short strings (e.g. uid=0, gid=0 with an\nodd-sized file handle), where the function writes up to 5 bytes past\nthe reserved XDR buffer. Conversely, when string lengths happen to be\n4-byte aligned, the reservation is too large and stale buffer content\nis sent to the client.\n\nFix this by breaking out every encoded field explicitly in the ds_len\ncalculation, using xdr_align_size() for all variable-length opaque\nfields, and correcting the header constants.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-89674"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/0380129b1373c437eb35401a174671c8888f4b80"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/29e4478e2ed5a227e8f0c33cacb91bf227cedd47"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/3a7fd224df0fbb42167eb1b77be45d72fe0b1098"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/65a72b721943618eeb3a41c8b36e915591f3f83f"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/bee826c00ac900473f91306f1f3e5a5a81fd4a74"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/c81cef6a805dec266c10fc4f83c93d6fcf1a2b43"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/e7d9d23ecd9172f05b09bb678ff22db8e361c428"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/f9868174af49d207fbaf0c5e055d088a983684af"
  } ],
  "database_specific" : {
    "cwe_ids" : [ ],
    "severity" : "CRITICAL",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-09-11T20:19:54Z"
  }
}