CVE-2026-89704: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-f634-v549-95r8
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CVSS 7.5
Published
Advisory Summary

CVE-2026-89704 is a HIGH (CVSS 7.5) security vulnerability vulnerability (General Security Weakness) affecting Software libraries in the Maven ecosystem. Remediation is available in the latest vendor maintenance releases.

CVE-2026-89704 at a Glance

CVE Identifier CVE-2026-89704
GHSA Identifier GHSA-f634-v549-95r8
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification General Security Weakness
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:H/A:N).

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 High (I:H)
Availability None (A:N)

How to Fix CVE-2026-89704

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-2026-89704, 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: sample writeback error cursor before async COPY loop _nfsd_copy_file_range() samples dst->f_wb_err into "since" after the copy loop, then uses it to detect writeback errors via filemap_check_wb_err() once vfs_fsync_range() returns. Because the nfsd_file cache reuses a single struct file across requests targeting the same inode, a concurrent COMMIT or stable WRITE on dst advances dst->f_wb_err to the current mapping->wb_err via file_check_and_advance_wb_err() during its own vfs_fsync_range(). If that advancement lands between the writeback error appearing in mapping->wb_err and the COPY worker sampling "since", the worker captures the already-advanced cursor, errseq_check() sees cur == since and returns zero, and NFSD4_COPY_F_COMMITTED is set even though writeback failed. CB_OFFLOAD then encodes wr_stable_how = FILE_SYNC4, the client treats the copied data as durable, and the failure becomes silent data loss. Sample since once at the start of the function. The cursor then reflects state in effect before this COPY issues any writes, and filemap_check_wb_err() detects any error that occurs during the copy regardless of which thread first observes it. This matches the pattern used by nfsd_vfs_write() and nfsd4_clone_file_range().

References

NVD — CVE-2026-89704 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-89704
git.kernel.org/stable/c/20a67a7d18... WEB
https://git.kernel.org/stable/c/20a67a7d18221af736f124770c2c5e859b479046
git.kernel.org/stable/c/322422d66d... WEB
https://git.kernel.org/stable/c/322422d66d1a04434a0dcc0c9d3a4c4b3f225117
git.kernel.org/stable/c/435e4246c7... WEB
https://git.kernel.org/stable/c/435e4246c7dfff2fbd76dfdbf91975d5d9f788c9
git.kernel.org/stable/c/4728504c02... WEB
https://git.kernel.org/stable/c/4728504c021656128a07f4693af80ed4a5fcc863
git.kernel.org/stable/c/52b2db7a72... WEB
https://git.kernel.org/stable/c/52b2db7a72e19ac2686fa4b2a52406661e7bf9e2
git.kernel.org/stable/c/8277d4a11a... WEB
https://git.kernel.org/stable/c/8277d4a11ae2cb5495842be558fd946032c24363
git.kernel.org/stable/c/9f539a1c07... WEB
https://git.kernel.org/stable/c/9f539a1c0791f907eb4e6d04b43178d9962e2def
git.kernel.org/stable/c/a1cbafe756... WEB
https://git.kernel.org/stable/c/a1cbafe756cd5e6ab0e099062f37da7a5b081169

Frequently Asked Questions

What is CVE-2026-89704?
CVE-2026-89704 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-2026-89704?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-89704?
CVE-2026-89704 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:H/A:N.
What CWE is associated with CVE-2026-89704?
CVE-2026-89704 is classified under General Security Weakness.
How can I check Maven dependencies for CVE-2026-89704?
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-f634-v549-95r8",
  "modified" : "2026-09-14T15:32:34Z",
  "published" : "2026-09-11T21:31:37Z",
  "aliases" : [ "CVE-2026-89704" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: sample writeback error cursor before async COPY loop\n\n_nfsd_copy_file_range() samples dst->f_wb_err into \"since\"\nafter the copy loop, then uses it to detect writeback errors\nvia filemap_check_wb_err() once vfs_fsync_range() returns.\nBecause the nfsd_file cache reuses a single struct file\nacross requests targeting the same inode, a concurrent\nCOMMIT or stable WRITE on dst advances dst->f_wb_err to the\ncurrent mapping->wb_err via file_check_and_advance_wb_err()\nduring its own vfs_fsync_range(). If that advancement lands\nbetween the writeback error appearing in mapping->wb_err\nand the COPY worker sampling \"since\", the worker captures\nthe already-advanced cursor, errseq_check() sees cur ==\nsince and returns zero, and NFSD4_COPY_F_COMMITTED is set\neven though writeback failed. CB_OFFLOAD then encodes\nwr_stable_how = FILE_SYNC4, the client treats the copied\ndata as durable, and the failure becomes silent data loss.\n\nSample since once at the start of the function. The cursor\nthen reflects state in effect before this COPY issues any\nwrites, and filemap_check_wb_err() detects any error that\noccurs during the copy regardless of which thread first\nobserves it. This matches the pattern used by\nnfsd_vfs_write() and nfsd4_clone_file_range().",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"
  } ],
  "affected" : [ ],
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    "url" : "https://git.kernel.org/stable/c/20a67a7d18221af736f124770c2c5e859b479046"
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    "url" : "https://git.kernel.org/stable/c/322422d66d1a04434a0dcc0c9d3a4c4b3f225117"
  }, {
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    "type" : "WEB",
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    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/9f539a1c0791f907eb4e6d04b43178d9962e2def"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/a1cbafe756cd5e6ab0e099062f37da7a5b081169"
  } ],
  "database_specific" : {
    "cwe_ids" : [ ],
    "severity" : "HIGH",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-09-11T20:19:57Z"
  }
}