CVE-2026-89649: Software Security Vulnerability Vulnerability

CRITICAL
Advisory Identifier: GHSA-j8wr-c6w3-j472
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CVSS 9.1
Published
Advisory Summary

CVE-2026-89649 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-2026-89649 at a Glance

CVE Identifier CVE-2026-89649
GHSA Identifier GHSA-j8wr-c6w3-j472
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-2026-89649

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-2026-89649, 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: ceph: bound xattr value length in __build_xattrs() __build_xattrs() decodes the MDS-supplied xattr blob one attribute at a time. For each attribute it reads a 32-bit name length, advances past the name bytes, reads a 32-bit value length, records the value pointer, and advances past the value bytes. The two length fields are read with ceph_decode_32_safe(), but the value bytes themselves are advanced over with a bare "p += len" and no ceph_decode_need() check that "len" bytes remain in the blob. For every attribute except the last, the next iteration's ceph_decode_32_safe() on the following name length implicitly verifies that the previous value did not run past the blob end. The final attribute has no successor, so its decoded value length is never checked against the blob bounds. A malicious or compromised metadata server can set the last attribute's value length larger than the bytes actually present in the blob. The blob is a dedicated kvmalloc() allocation sized to the wire length (ceph_buffer_new() in ceph_fill_inode()). __set_xattr() records the oversized length in xattr->val_len verbatim, and a later getxattr(2) runs memcpy(value, xattr->val, xattr->val_len) into a user-supplied buffer, copying bytes past the end of the allocation back to user space. Impact: a malicious metadata server discloses adjacent kernel heap bytes to a local user via getxattr(2) on a CephFS file. Add the missing ceph_decode_need() so an out-of-bounds value length on the final attribute fails the decode and returns -EIO instead of being stored.

References

NVD — CVE-2026-89649 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-89649
git.kernel.org/stable/c/01e3f19c30... WEB
https://git.kernel.org/stable/c/01e3f19c301d492e12f16b3b463ac14d7cf3ebe7
git.kernel.org/stable/c/1dd356310b... WEB
https://git.kernel.org/stable/c/1dd356310b1660215f9a3626580bf8b363ef981e
git.kernel.org/stable/c/38be2f3c41... WEB
https://git.kernel.org/stable/c/38be2f3c41ecaba58bb92dc16603e09ba9fd64f1
git.kernel.org/stable/c/61f085cb89... WEB
https://git.kernel.org/stable/c/61f085cb8976c9cebc90e1a8933e4cc1ad8b0fce
git.kernel.org/stable/c/68d541754d... WEB
https://git.kernel.org/stable/c/68d541754d6cd3bb98d1fd8314f57e5eb533557d
git.kernel.org/stable/c/848b80ca6b... WEB
https://git.kernel.org/stable/c/848b80ca6b410f350d08b8ac19a00ef88223f2ea
git.kernel.org/stable/c/b12b3320c8... WEB
https://git.kernel.org/stable/c/b12b3320c81fd72ab36388fb2445fec9c3038f10
git.kernel.org/stable/c/cb0cd79ae8... WEB
https://git.kernel.org/stable/c/cb0cd79ae80476d1bc06bd9678484b6736f19588

Frequently Asked Questions

What is CVE-2026-89649?
CVE-2026-89649 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-2026-89649?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-89649?
CVE-2026-89649 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-2026-89649?
CVE-2026-89649 is classified under General Security Weakness.
How can I check Maven dependencies for CVE-2026-89649?
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-j8wr-c6w3-j472",
  "modified" : "2026-09-14T15:32:33Z",
  "published" : "2026-09-11T21:31:35Z",
  "aliases" : [ "CVE-2026-89649" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nceph: bound xattr value length in __build_xattrs()\n\n__build_xattrs() decodes the MDS-supplied xattr blob one attribute at a\ntime. For each attribute it reads a 32-bit name length, advances past the\nname bytes, reads a 32-bit value length, records the value pointer, and\nadvances past the value bytes. The two length fields are read with\nceph_decode_32_safe(), but the value bytes themselves are advanced over\nwith a bare \"p += len\" and no ceph_decode_need() check that \"len\" bytes\nremain in the blob.\n\nFor every attribute except the last, the next iteration's\nceph_decode_32_safe() on the following name length implicitly verifies\nthat the previous value did not run past the blob end. The final\nattribute has no successor, so its decoded value length is never checked\nagainst the blob bounds. A malicious or compromised metadata server can\nset the last attribute's value length larger than the bytes actually\npresent in the blob.\n\nThe blob is a dedicated kvmalloc() allocation sized to the wire length\n(ceph_buffer_new() in ceph_fill_inode()). __set_xattr() records the\noversized length in xattr->val_len verbatim, and a later getxattr(2) runs\nmemcpy(value, xattr->val, xattr->val_len) into a user-supplied buffer,\ncopying bytes past the end of the allocation back to user space.\n\nImpact: a malicious metadata server discloses adjacent kernel heap bytes\nto a local user via getxattr(2) on a CephFS file. Add the missing\nceph_decode_need() so an out-of-bounds value length on the final\nattribute fails the decode and returns -EIO instead of being stored.",
  "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-2026-89649"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/01e3f19c301d492e12f16b3b463ac14d7cf3ebe7"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/1dd356310b1660215f9a3626580bf8b363ef981e"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/38be2f3c41ecaba58bb92dc16603e09ba9fd64f1"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/61f085cb8976c9cebc90e1a8933e4cc1ad8b0fce"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/68d541754d6cd3bb98d1fd8314f57e5eb533557d"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/848b80ca6b410f350d08b8ac19a00ef88223f2ea"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/b12b3320c81fd72ab36388fb2445fec9c3038f10"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/cb0cd79ae80476d1bc06bd9678484b6736f19588"
  } ],
  "database_specific" : {
    "cwe_ids" : [ ],
    "severity" : "CRITICAL",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-09-11T20:19:50Z"
  }
}