CVE-2026-64440: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-mgm7-8p4q-p28m
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CVSS 8.1
CWE-787
Published
Advisory Summary

CVE-2026-64440 is a HIGH (CVSS 8.1) security vulnerability vulnerability (CWE-787: Out-of-bounds Write) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product writes data past the end, or before the beginning, of the intended buffer.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-64440 at a Glance

CVE Identifier CVE-2026-64440
GHSA Identifier GHSA-mgm7-8p4q-p28m
Severity HIGH
CVSS v3.1 Base Score 8.1
CWE Classification CWE-787: Out-of-bounds Write
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 8.1

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H).

Attack Vector Adjacent (AV:A)
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 High (A:H)

How to Fix CVE-2026-64440

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-2026-64440, 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-787: Out-of-bounds Write, where the product writes data past the end, or before the beginning, of the intended buffer. 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: staging: rtl8723bs: fix OOB write in HT_caps_handler() HT_caps_handler() iterates pIE->length bytes and writes into HT_caps.u.HT_cap[], which is a fixed 26-byte array (sizeof struct HT_caps_element). Because pIE->length is a raw u8 from an over-the-air 802.11 AssocResponse frame and is never validated, a malicious AP can set it up to 255, causing up to 229 bytes of out-of-bounds writes into adjacent fields of struct mlme_ext_info. Truncate the iteration count to the size of HT_caps.u.HT_cap using umin() so that data from a longer-than-expected IE is silently ignored rather than written out of bounds, preserving interoperability with APs that pad the element. An early return on oversized IEs was considered but rejected: it would bypass the pmlmeinfo->HT_caps_enable = 1 assignment that precedes the loop, silently disabling HT mode for APs that append extra bytes to the HT Capabilities IE.

References

NVD — CVE-2026-64440 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-64440
git.kernel.org/stable/c/225b6d3fc7... WEB
https://git.kernel.org/stable/c/225b6d3fc7e99ac3d20b6c861d1e47d24e7ea31d
git.kernel.org/stable/c/37f642d47c... WEB
https://git.kernel.org/stable/c/37f642d47c3648a707df3ceb092eee1adffbfd28
git.kernel.org/stable/c/6f91621fc4... WEB
https://git.kernel.org/stable/c/6f91621fc45025ad3c0be796b70e6e4cee22fc69
git.kernel.org/stable/c/8c872b47c7... WEB
https://git.kernel.org/stable/c/8c872b47c7fc32e95e0da1db7512388794adcd69
git.kernel.org/stable/c/918537a0fb... WEB
https://git.kernel.org/stable/c/918537a0fbed85aab61fa28ad75e6279070610c9
git.kernel.org/stable/c/bb3b942da4... WEB
https://git.kernel.org/stable/c/bb3b942da4123b55d1cacf19d1a7d5ba15dbf83a
git.kernel.org/stable/c/f8001e1a51... WEB
https://git.kernel.org/stable/c/f8001e1a516ba3b495728c65b61f799cbfad6bd0

Frequently Asked Questions

What is CVE-2026-64440?
CVE-2026-64440 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-787: Out-of-bounds Write.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-64440?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-64440?
CVE-2026-64440 has a CVSS v3.1 base score of 8.1 (HIGH) with vector string CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H.
What CWE is associated with CVE-2026-64440?
CVE-2026-64440 is classified under CWE-787: Out-of-bounds Write (The product writes data past the end, or before the beginning, of the intended buffer.).
How can I check Maven dependencies for CVE-2026-64440?
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-mgm7-8p4q-p28m",
  "modified" : "2026-07-27T06:30:37Z",
  "published" : "2026-07-25T12:31:35Z",
  "aliases" : [ "CVE-2026-64440" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nstaging: rtl8723bs: fix OOB write in HT_caps_handler()\n\nHT_caps_handler() iterates pIE->length bytes and writes into\nHT_caps.u.HT_cap[], which is a fixed 26-byte array (sizeof struct\nHT_caps_element). Because pIE->length is a raw u8 from an over-the-air\n802.11 AssocResponse frame and is never validated, a malicious AP can\nset it up to 255, causing up to 229 bytes of out-of-bounds writes into\nadjacent fields of struct mlme_ext_info.\n\nTruncate the iteration count to the size of HT_caps.u.HT_cap using\numin() so that data from a longer-than-expected IE is silently ignored\nrather than written out of bounds, preserving interoperability with APs\nthat pad the element. An early return on oversized IEs was considered\nbut rejected: it would bypass the pmlmeinfo->HT_caps_enable = 1\nassignment that precedes the loop, silently disabling HT mode for APs\nthat append extra bytes to the HT Capabilities IE.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-64440"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/225b6d3fc7e99ac3d20b6c861d1e47d24e7ea31d"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/37f642d47c3648a707df3ceb092eee1adffbfd28"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/6f91621fc45025ad3c0be796b70e6e4cee22fc69"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/8c872b47c7fc32e95e0da1db7512388794adcd69"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/918537a0fbed85aab61fa28ad75e6279070610c9"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/bb3b942da4123b55d1cacf19d1a7d5ba15dbf83a"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/f8001e1a516ba3b495728c65b61f799cbfad6bd0"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-787" ],
    "severity" : "HIGH",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-07-25T10:17:28Z"
  }
}