CVE-2026-46064: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-4p2m-h7j8-hhxj
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CVSS 7.1
CWE-125
Published
Advisory Summary

CVE-2026-46064 is a HIGH (CVSS 7.1) security vulnerability vulnerability (CWE-125: Out-of-bounds Read) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product reads data past the end, or before the beginning, of the intended buffer.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-46064 at a Glance

CVE Identifier CVE-2026-46064
GHSA Identifier GHSA-4p2m-h7j8-hhxj
Severity HIGH
CVSS v3.1 Base Score 7.1
CWE Classification CWE-125: Out-of-bounds Read
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 7.1

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

Attack Vector Local (AV:L)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
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-2026-46064

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-2026-46064, 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-125: Out-of-bounds Read, where the product reads 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: ibmasm: fix heap over-read in ibmasm_send_i2o_message() The ibmasm_send_i2o_message() function uses get_dot_command_size() to compute the byte count for memcpy_toio(), but this value is derived from user-controlled fields in the dot_command_header (command_size: u8, data_size: u16) and is never validated against the actual allocation size. A root user can write a small buffer with inflated header fields, causing memcpy_toio() to read up to ~65 KB past the end of the allocation into adjacent kernel heap, which is then forwarded to the service processor over MMIO. Silently clamping the copy size is not sufficient: if the header fields claim a larger size than the buffer, the SP receives a dot command whose own header is inconsistent with the I2O message length, which can cause the SP to desynchronize. Reject such commands outright by returning failure. Validate command_size before calling get_mfa_inbound() to avoid leaking an I2O message frame: reading INBOUND_QUEUE_PORT dequeues a hardware frame from the controller's free pool, and returning without a corresponding set_mfa_inbound() call would permanently exhaust it. Additionally, clamp command_size to I2O_COMMAND_SIZE before the memcpy_toio() so the MMIO write stays within the I2O message frame, consistent with the clamping already performed by outgoing_message_size() for the header field.

References

NVD — CVE-2026-46064 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-46064
cert-portal.siemens.com/productcert/html/ss... WEB
https://cert-portal.siemens.com/productcert/html/ssa-784472.html
git.kernel.org/stable/c/9aad71144f... WEB
https://git.kernel.org/stable/c/9aad71144fa3682cca3837a06c8623016790e7ec
git.kernel.org/stable/c/9e8f6c9d4e... WEB
https://git.kernel.org/stable/c/9e8f6c9d4ecddda2f28baa1678340286cff3969c
git.kernel.org/stable/c/b870f65287... WEB
https://git.kernel.org/stable/c/b870f652877bfbe321bd0f4096fc37a93296f7b6
git.kernel.org/stable/c/c1c2417c60... WEB
https://git.kernel.org/stable/c/c1c2417c60dbdca5ebb00462f21ee71c2d7f7083
git.kernel.org/stable/c/ca1c857e2b... WEB
https://git.kernel.org/stable/c/ca1c857e2bb74a9fc0606128334f85316d57067b
git.kernel.org/stable/c/ce57fa439b... WEB
https://git.kernel.org/stable/c/ce57fa439bd1b5d664f334a0c3e3f0e42abb0153
git.kernel.org/stable/c/fd19eb1c75... WEB
https://git.kernel.org/stable/c/fd19eb1c75047a4ed4e855f56cafd704dc3914e0
git.kernel.org/stable/c/fe31722b01... WEB
https://git.kernel.org/stable/c/fe31722b0194ff76bf8b461e8bf97a2081147787

Frequently Asked Questions

What is CVE-2026-46064?
CVE-2026-46064 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-125: Out-of-bounds Read.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-46064?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-46064?
CVE-2026-46064 has a CVSS v3.1 base score of 7.1 (HIGH) with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H.
What CWE is associated with CVE-2026-46064?
CVE-2026-46064 is classified under CWE-125: Out-of-bounds Read (The product reads data past the end, or before the beginning, of the intended buffer.).
How can I check Maven dependencies for CVE-2026-46064?
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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  "id" : "GHSA-4p2m-h7j8-hhxj",
  "modified" : "2026-10-15T03:35:58Z",
  "published" : "2026-05-27T15:33:22Z",
  "aliases" : [ "CVE-2026-46064" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nibmasm: fix heap over-read in ibmasm_send_i2o_message()\n\nThe ibmasm_send_i2o_message() function uses get_dot_command_size() to\ncompute the byte count for memcpy_toio(), but this value is derived from\nuser-controlled fields in the dot_command_header (command_size: u8,\ndata_size: u16) and is never validated against the actual allocation size.\nA root user can write a small buffer with inflated header fields, causing\nmemcpy_toio() to read up to ~65 KB past the end of the allocation into\nadjacent kernel heap, which is then forwarded to the service processor\nover MMIO.\n\nSilently clamping the copy size is not sufficient: if the header fields\nclaim a larger size than the buffer, the SP receives a dot command whose\nown header is inconsistent with the I2O message length, which can cause\nthe SP to desynchronize. Reject such commands outright by returning\nfailure.\n\nValidate command_size before calling get_mfa_inbound() to avoid leaking\nan I2O message frame: reading INBOUND_QUEUE_PORT dequeues a hardware\nframe from the controller's free pool, and returning without a\ncorresponding set_mfa_inbound() call would permanently exhaust it.\n\nAdditionally, clamp command_size to I2O_COMMAND_SIZE before the\nmemcpy_toio() so the MMIO write stays within the I2O message frame,\nconsistent with the clamping already performed by outgoing_message_size()\nfor the header field.",
  "severity" : [ {
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    "url" : "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"
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  }, {
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    "url" : "https://git.kernel.org/stable/c/fd19eb1c75047a4ed4e855f56cafd704dc3914e0"
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    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/fe31722b0194ff76bf8b461e8bf97a2081147787"
  } ],
  "database_specific" : {
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    "severity" : "HIGH",
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    "nvd_published_at" : "2026-05-27T14:17:26Z"
  }
}