CVE-2026-89786: Software Security Vulnerability Vulnerability

CRITICAL
Advisory Identifier: GHSA-7xr2-rx94-5f89
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CVSS 9.1
Published
Advisory Summary

CVE-2026-89786 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-2026-89786 at a Glance

CVE Identifier CVE-2026-89786
GHSA Identifier GHSA-7xr2-rx94-5f89
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-2026-89786

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-2026-89786, 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: ext4: fix out-of-bounds read in ext4_read_inline_dir() ext4_read_inline_dir() can read a dirent header past the end of its inline buffer, triggering a slab-out-of-bounds read during getdents64(): BUG: KASAN: slab-out-of-bounds in __ext4_check_dir_entry Read of size 2 at addr ffff88800f3dd23c by task exploit/148 ... __ext4_check_dir_entry ext4_read_inline_dir iterate_dir The dirent payload lives in a buffer of exactly inline_size bytes: dir_buf = kmalloc(inline_size, GFP_NOFS); but iteration runs in a position space extra_offset bytes larger (extra_size = extra_offset + inline_size) so the synthetic "." and ".." land at their block-dir offsets. A dirent is formed at "dir_buf + pos - extra_offset", yet the ext4_check_dir_entry() length argument uses the larger extra_size. A position whose dirent header would extend past extra_size is therefore accepted, and the rescan loop's rec_len probe and ext4_check_dir_entry() dereference de->rec_len before the entry is rejected. Reject a position whose minimum-size dirent header would not fit within extra_size before forming de, in both the rescan and main loops, and pass inline_size rather than extra_size to ext4_check_dir_entry() so the length check matches the physical buffer.

References

NVD — CVE-2026-89786 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-89786
git.kernel.org/stable/c/1a1dea633b... WEB
https://git.kernel.org/stable/c/1a1dea633b724a1c042dbcdb1fed27f410916688
git.kernel.org/stable/c/36bf17bb90... WEB
https://git.kernel.org/stable/c/36bf17bb90cdf7a623499b624b05acde4d2feef5
git.kernel.org/stable/c/5fd20d4e50... WEB
https://git.kernel.org/stable/c/5fd20d4e50dd6e460b3ea8e4396f8553d4526f8f
git.kernel.org/stable/c/6702c7da86... WEB
https://git.kernel.org/stable/c/6702c7da86d8cdb88d0fc57166286e115ffeb8c0
git.kernel.org/stable/c/9333cc809f... WEB
https://git.kernel.org/stable/c/9333cc809f0a89e001b814155a6cb8903a6274df
git.kernel.org/stable/c/b060861f66... WEB
https://git.kernel.org/stable/c/b060861f662d4826dc700a1c3584243bb3474cfe
git.kernel.org/stable/c/d1e7c18655... WEB
https://git.kernel.org/stable/c/d1e7c186555ad65554fd2f2b02f5a539aa35ae48

Frequently Asked Questions

What is CVE-2026-89786?
CVE-2026-89786 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-2026-89786?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-89786?
CVE-2026-89786 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-2026-89786?
CVE-2026-89786 is classified under General Security Weakness.
How can I check Maven dependencies for CVE-2026-89786?
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-7xr2-rx94-5f89",
  "modified" : "2026-09-16T15:30:57Z",
  "published" : "2026-09-16T09:30:30Z",
  "aliases" : [ "CVE-2026-89786" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix out-of-bounds read in ext4_read_inline_dir()\n\next4_read_inline_dir() can read a dirent header past the end of its inline\nbuffer, triggering a slab-out-of-bounds read during getdents64():\n\n  BUG: KASAN: slab-out-of-bounds in __ext4_check_dir_entry\n  Read of size 2 at addr ffff88800f3dd23c by task exploit/148\n   ...\n   __ext4_check_dir_entry\n   ext4_read_inline_dir\n   iterate_dir\n\nThe dirent payload lives in a buffer of exactly inline_size bytes:\n\n\tdir_buf = kmalloc(inline_size, GFP_NOFS);\n\nbut iteration runs in a position space extra_offset bytes larger\n(extra_size = extra_offset + inline_size) so the synthetic \".\" and \"..\"\nland at their block-dir offsets. A dirent is formed at \"dir_buf + pos -\nextra_offset\", yet the ext4_check_dir_entry() length argument uses the\nlarger extra_size. A position whose dirent header would extend past\nextra_size is therefore accepted, and the rescan loop's rec_len probe and\next4_check_dir_entry() dereference de->rec_len before the entry is rejected.\n\nReject a position whose minimum-size dirent header would not fit within\nextra_size before forming de, in both the rescan and main loops, and pass\ninline_size rather than extra_size to ext4_check_dir_entry() so the length\ncheck matches the physical buffer.",
  "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-2026-89786"
  }, {
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    "url" : "https://git.kernel.org/stable/c/1a1dea633b724a1c042dbcdb1fed27f410916688"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/36bf17bb90cdf7a623499b624b05acde4d2feef5"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/5fd20d4e50dd6e460b3ea8e4396f8553d4526f8f"
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    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/9333cc809f0a89e001b814155a6cb8903a6274df"
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    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/b060861f662d4826dc700a1c3584243bb3474cfe"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/d1e7c186555ad65554fd2f2b02f5a539aa35ae48"
  } ],
  "database_specific" : {
    "cwe_ids" : [ ],
    "severity" : "CRITICAL",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-09-16T09:17:09Z"
  }
}