CVE-2026-43067: Software Security Vulnerability Vulnerability

CRITICAL
Advisory Identifier: GHSA-845x-q62g-4v8p
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CVSS 9.8
CWE-822
Published
Advisory Summary

CVE-2026-43067 is a CRITICAL (CVSS 9.8) security vulnerability vulnerability (CWE-822: Untrusted Pointer Dereference) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product obtains a value from an untrusted source, converts this value to a pointer, and dereferences the resulting pointer.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-43067 at a Glance

CVE Identifier CVE-2026-43067
GHSA Identifier GHSA-845x-q62g-4v8p
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-822: Untrusted Pointer Dereference
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-2026-43067

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-2026-43067, 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 CWE-822: Untrusted Pointer Dereference, where the product obtains a value from an untrusted source, converts this value to a pointer, and dereferences the resulting pointer. 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: handle wraparound when searching for blocks for indirect mapped blocks Commit 4865c768b563 ("ext4: always allocate blocks only from groups inode can use") restricts what blocks will be allocated for indirect block based files to block numbers that fit within 32-bit block numbers. However, when using a review bot running on the latest Gemini LLM to check this commit when backporting into an LTS based kernel, it raised this concern: If ac->ac_g_ex.fe_group is >= ngroups (for instance, if the goal group was populated via stream allocation from s_mb_last_groups), then start will be >= ngroups. Does this allow allocating blocks beyond the 32-bit limit for indirect block mapped files? The commit message mentions that ext4_mb_scan_groups_linear() takes care to not select unsupported groups. However, its loop uses group = *start, and the very first iteration will call ext4_mb_scan_group() with this unsupported group because next_linear_group() is only called at the end of the iteration. After reviewing the code paths involved and considering the LLM review, I determined that this can happen when there is a file system where some files/directories are extent-mapped and others are indirect-block mapped. To address this, add a safety clamp in ext4_mb_scan_groups().

References

NVD — CVE-2026-43067 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-43067
git.kernel.org/stable/c/12624c5b72... WEB
https://git.kernel.org/stable/c/12624c5b724a81e14e532972b40d863b0de3b7d1
git.kernel.org/stable/c/2a368ccddf... WEB
https://git.kernel.org/stable/c/2a368ccddfc492a0aa951e2caef2985f20e96503
git.kernel.org/stable/c/4bec4a498c... WEB
https://git.kernel.org/stable/c/4bec4a498ce86314d470ae6144120461f2138c29
git.kernel.org/stable/c/83170a0590... WEB
https://git.kernel.org/stable/c/83170a05908b6cf2fb3235d3065bf613ff866f3c
git.kernel.org/stable/c/bb81702370... WEB
https://git.kernel.org/stable/c/bb81702370fad22c06ca12b6e1648754dbc37e0f
git.kernel.org/stable/c/f89bba1449... WEB
https://git.kernel.org/stable/c/f89bba144938921a2249237ad04a0183ff3f8930

Frequently Asked Questions

What is CVE-2026-43067?
CVE-2026-43067 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-822: Untrusted Pointer Dereference.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-43067?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-43067?
CVE-2026-43067 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-2026-43067?
CVE-2026-43067 is classified under CWE-822: Untrusted Pointer Dereference (The product obtains a value from an untrusted source, converts this value to a pointer, and dereferences the resulting pointer.).
How can I check Maven dependencies for CVE-2026-43067?
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 
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  "schema_version" : "1.4.0",
  "id" : "GHSA-845x-q62g-4v8p",
  "modified" : "2026-05-08T15:31:15Z",
  "published" : "2026-05-05T18:33:25Z",
  "aliases" : [ "CVE-2026-43067" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\next4: handle wraparound when searching for blocks for indirect mapped blocks\n\nCommit 4865c768b563 (\"ext4: always allocate blocks only from groups\ninode can use\") restricts what blocks will be allocated for indirect\nblock based files to block numbers that fit within 32-bit block\nnumbers.\n\nHowever, when using a review bot running on the latest Gemini LLM to\ncheck this commit when backporting into an LTS based kernel, it raised\nthis concern:\n\n   If ac->ac_g_ex.fe_group is >= ngroups (for instance, if the goal\n   group was populated via stream allocation from s_mb_last_groups),\n   then start will be >= ngroups.\n\n   Does this allow allocating blocks beyond the 32-bit limit for\n   indirect block mapped files? The commit message mentions that\n   ext4_mb_scan_groups_linear() takes care to not select unsupported\n   groups. However, its loop uses group = *start, and the very first\n   iteration will call ext4_mb_scan_group() with this unsupported\n   group because next_linear_group() is only called at the end of the\n   iteration.\n\nAfter reviewing the code paths involved and considering the LLM\nreview, I determined that this can happen when there is a file system\nwhere some files/directories are extent-mapped and others are\nindirect-block mapped.  To address this, add a safety clamp in\next4_mb_scan_groups().",
  "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-2026-43067"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/12624c5b724a81e14e532972b40d863b0de3b7d1"
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    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/2a368ccddfc492a0aa951e2caef2985f20e96503"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/4bec4a498ce86314d470ae6144120461f2138c29"
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    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/83170a05908b6cf2fb3235d3065bf613ff866f3c"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/bb81702370fad22c06ca12b6e1648754dbc37e0f"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/f89bba144938921a2249237ad04a0183ff3f8930"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-822" ],
    "severity" : "CRITICAL",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-05-05T16:16:15Z"
  }
}