CVE-2026-43133: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-g9j5-v9rr-m845
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CVSS 7.9
CWE-754 CWE-628
Published
Advisory Summary

CVE-2026-43133 is a HIGH (CVSS 7.9) security vulnerability vulnerability (CWE-754: Improper Check for Unusual or Exceptional Conditions) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product does not check or incorrectly checks for unusual or exceptional conditions that are not expected to occur frequently during day to day operation of the product.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-43133 at a Glance

CVE Identifier CVE-2026-43133
GHSA Identifier GHSA-g9j5-v9rr-m845
Severity HIGH
CVSS v3.1 Base Score 7.9
CWE Classification CWE-754: Improper Check for Unusual or Exceptional Conditions
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 7.9

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:C/C:L/I:L/A:H).

Attack Vector Local (AV:L)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
User Interaction None (UI:N)
Scope Changed (S:C)
Confidentiality Low (C:L)
Integrity Low (I:L)
Availability High (A:H)

How to Fix CVE-2026-43133

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-2026-43133, 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-754: Improper Check for Unusual or Exceptional Conditions, where the product does not check or incorrectly checks for unusual or exceptional conditions that are not expected to occur frequently during day to day operation of the product. 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: KVM: nSVM: Always use vmcb01 in VMLOAD/VMSAVE emulation Commit cc3ed80ae69f ("KVM: nSVM: always use vmcb01 to for vmsave/vmload of guest state") made KVM always use vmcb01 for the fields controlled by VMSAVE/VMLOAD, but it missed updating the VMLOAD/VMSAVE emulation code to always use vmcb01. As a result, if VMSAVE/VMLOAD is executed by an L2 guest and is not intercepted by L1, KVM will mistakenly use vmcb02. Always use vmcb01 instead of the current VMCB.

References

NVD — CVE-2026-43133 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-43133
access.redhat.com/errata/rhsa-2026:65... WEB
https://access.redhat.com/errata/RHSA-2026:65334
access.redhat.com/errata/rhsa-2026:66... WEB
https://access.redhat.com/errata/RHSA-2026:66180
access.redhat.com/errata/rhsa-2026:66... WEB
https://access.redhat.com/errata/RHSA-2026:66357
access.redhat.com/errata/rhsa-2026:67... WEB
https://access.redhat.com/errata/RHSA-2026:67468
access.redhat.com/errata/rhsa-2026:67... WEB
https://access.redhat.com/errata/RHSA-2026:67469
Software Security Information SECURITY
https://access.redhat.com/security/cve/CVE-2026-43133
bugzilla.redhat.com/show_bug.cgi WEB
https://bugzilla.redhat.com/show_bug.cgi?id=2467065
git.kernel.org/stable/c/0004ecb798... WEB
https://git.kernel.org/stable/c/0004ecb798b30e90d7ebfe74efae2d9423315a64
git.kernel.org/stable/c/10063e1251... WEB
https://git.kernel.org/stable/c/10063e1251c1485034a018236080792ad083dcc5
git.kernel.org/stable/c/127ccae2c1... WEB
https://git.kernel.org/stable/c/127ccae2c185f62e6ecb4bf24f9cb307e9b9c619
git.kernel.org/stable/c/3880e331b0... WEB
https://git.kernel.org/stable/c/3880e331b0b31d0d5d3702b124f6c93539cd478a
git.kernel.org/stable/c/c3b7015000... WEB
https://git.kernel.org/stable/c/c3b7015000988ba35ecd5648f4b2283960f00543
git.kernel.org/stable/c/d464cf1ed9... WEB
https://git.kernel.org/stable/c/d464cf1ed900d47c85393d40b00017b6adfc2e6c
git.kernel.org/stable/c/fce2fd4a2c... WEB
https://git.kernel.org/stable/c/fce2fd4a2ca05670a91015aacccf96a1c26268fd
Software Security Information SECURITY
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43133.json

Frequently Asked Questions

What is CVE-2026-43133?
CVE-2026-43133 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-754: Improper Check for Unusual or Exceptional Conditions.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-43133?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-43133?
CVE-2026-43133 has a CVSS v3.1 base score of 7.9 (HIGH) with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H.
What CWE is associated with CVE-2026-43133?
CVE-2026-43133 is classified under CWE-754: Improper Check for Unusual or Exceptional Conditions (The product does not check or incorrectly checks for unusual or exceptional conditions that are not expected to occur frequently during day to day operation of the product.).
How can I check Maven dependencies for CVE-2026-43133?
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-g9j5-v9rr-m845",
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  "published" : "2026-05-06T12:30:29Z",
  "aliases" : [ "CVE-2026-43133" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: nSVM: Always use vmcb01 in VMLOAD/VMSAVE emulation\n\nCommit cc3ed80ae69f (\"KVM: nSVM: always use vmcb01 to for vmsave/vmload\nof guest state\") made KVM always use vmcb01 for the fields controlled by\nVMSAVE/VMLOAD, but it missed updating the VMLOAD/VMSAVE emulation code\nto always use vmcb01.\n\nAs a result, if VMSAVE/VMLOAD is executed by an L2 guest and is not\nintercepted by L1, KVM will mistakenly use vmcb02. Always use vmcb01\ninstead of the current VMCB.",
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    "url" : "https://access.redhat.com/errata/RHSA-2026:67468"
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  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/10063e1251c1485034a018236080792ad083dcc5"
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    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/127ccae2c185f62e6ecb4bf24f9cb307e9b9c619"
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    "url" : "https://git.kernel.org/stable/c/3880e331b0b31d0d5d3702b124f6c93539cd478a"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/c3b7015000988ba35ecd5648f4b2283960f00543"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/d464cf1ed900d47c85393d40b00017b6adfc2e6c"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/fce2fd4a2ca05670a91015aacccf96a1c26268fd"
  }, {
    "type" : "WEB",
    "url" : "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43133.json"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-628", "CWE-754" ],
    "severity" : "HIGH",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-05-06T12:16:30Z"
  }
}