CVE-2026-68431: Software Security Vulnerability Vulnerability

CRITICAL
Advisory Identifier: GHSA-6pm5-g7cv-g948
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CVSS 9.1
Published
Advisory Summary

CVE-2026-68431 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-2026-68431 at a Glance

CVE Identifier CVE-2026-68431
GHSA Identifier GHSA-6pm5-g7cv-g948
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-2026-68431

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-2026-68431, 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: ksmbd: validate minimum PDU size for transform requests The receive path applies the minimum SMB2 PDU size check only when ProtocolId is SMB2_PROTO_NUMBER. A packet carrying SMB2_TRANSFORM_PROTO_NUM bypasses the check even when the negotiated dialect does not provide transform handling. On an SMB 2.1 connection, a short transform packet therefore reaches init_smb2_rsp_hdr(), which interprets the request as a full SMB2 header and reads beyond the request allocation. The copied fields can then be returned to the unauthenticated client. Compression transforms are converted to ordinary SMB2 messages before protocol validation. After that conversion, validate ordinary SMB2 requests against SMB2_MIN_SUPPORTED_PDU_SIZE and require encryption transform requests to contain both a transform header and an SMB2 header. This rejects truncated requests before work allocation.

References

NVD — CVE-2026-68431 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-68431
git.kernel.org/stable/c/22f1aa35b8... WEB
https://git.kernel.org/stable/c/22f1aa35b87e471cc31b35b74451f46630863b12
git.kernel.org/stable/c/32e486b70c... WEB
https://git.kernel.org/stable/c/32e486b70c256d5ef4baa5a2936ade2fea50e8eb
git.kernel.org/stable/c/928dda88d0... WEB
https://git.kernel.org/stable/c/928dda88d0e13fbca381255028f65b244343a4ea
git.kernel.org/stable/c/b62c510f59... WEB
https://git.kernel.org/stable/c/b62c510f59803f82f9b4c76ead2a56833b2984c7
git.kernel.org/stable/c/cfc0b8e508... WEB
https://git.kernel.org/stable/c/cfc0b8e5080aec87700774e8568765eaa4b7b92b
git.kernel.org/stable/c/d8e5c56727... WEB
https://git.kernel.org/stable/c/d8e5c5672724b8f3c4c099d2cf60239c996e5424
git.kernel.org/stable/c/d9e9753dfd... WEB
https://git.kernel.org/stable/c/d9e9753dfd43bd27c956578df7804a3c90b80fdc

Frequently Asked Questions

What is CVE-2026-68431?
CVE-2026-68431 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-2026-68431?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-68431?
CVE-2026-68431 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-2026-68431?
CVE-2026-68431 is classified under General Security Weakness.
How can I check Maven dependencies for CVE-2026-68431?
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-6pm5-g7cv-g948",
  "modified" : "2026-08-23T15:32:57Z",
  "published" : "2026-08-12T00:31:12Z",
  "aliases" : [ "CVE-2026-68431" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: validate minimum PDU size for transform requests\n\nThe receive path applies the minimum SMB2 PDU size check only when\nProtocolId is SMB2_PROTO_NUMBER. A packet carrying\nSMB2_TRANSFORM_PROTO_NUM bypasses the check even when the negotiated\ndialect does not provide transform handling.\n\nOn an SMB 2.1 connection, a short transform packet therefore reaches\ninit_smb2_rsp_hdr(), which interprets the request as a full SMB2 header\nand reads beyond the request allocation. The copied fields can then be\nreturned to the unauthenticated client.\n\nCompression transforms are converted to ordinary SMB2 messages before\nprotocol validation. After that conversion, validate ordinary SMB2\nrequests against SMB2_MIN_SUPPORTED_PDU_SIZE and require encryption\ntransform requests to contain both a transform header and an SMB2\nheader. This rejects truncated requests before work allocation.",
  "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-2026-68431"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/22f1aa35b87e471cc31b35b74451f46630863b12"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/32e486b70c256d5ef4baa5a2936ade2fea50e8eb"
  }, {
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    "type" : "WEB",
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  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/d8e5c5672724b8f3c4c099d2cf60239c996e5424"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/d9e9753dfd43bd27c956578df7804a3c90b80fdc"
  } ],
  "database_specific" : {
    "cwe_ids" : [ ],
    "severity" : "CRITICAL",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-08-12T00:17:43Z"
  }
}