CVE-2026-43107: Software Security Vulnerability Vulnerability

MODERATE
Advisory Identifier: GHSA-v6vr-f94r-r434
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CVSS 5.5
CWE-131
Published
Advisory Summary

CVE-2026-43107 is a MODERATE (CVSS 5.5) security vulnerability vulnerability (CWE-131: Incorrect Calculation of Buffer Size) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product does not correctly calculate the size to be used when allocating a buffer, which could lead to a buffer overflow.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-43107 at a Glance

CVE Identifier CVE-2026-43107
GHSA Identifier GHSA-v6vr-f94r-r434
Severity MODERATE
CVSS v3.1 Base Score 5.5
CWE Classification CWE-131: Incorrect Calculation of Buffer Size
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 5.5

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:N/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 None (C:N)
Integrity None (I:N)
Availability High (A:H)

How to Fix CVE-2026-43107

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-2026-43107, 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-131: Incorrect Calculation of Buffer Size, where the product does not correctly calculate the size to be used when allocating a buffer, which could lead to a buffer overflow. 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: xfrm: account XFRMA_IF_ID in aevent size calculation xfrm_get_ae() allocates the reply skb with xfrm_aevent_msgsize(), then build_aevent() appends attributes including XFRMA_IF_ID when x->if_id is set. xfrm_aevent_msgsize() does not include space for XFRMA_IF_ID. For states with if_id, build_aevent() can fail with -EMSGSIZE and hit BUG_ON(err < 0) in xfrm_get_ae(), turning a malformed netlink interaction into a kernel panic. Account XFRMA_IF_ID in the size calculation unconditionally and replace the BUG_ON with normal error unwinding.

References

NVD — CVE-2026-43107 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-43107
git.kernel.org/stable/c/2c41283d94... WEB
https://git.kernel.org/stable/c/2c41283d94af943a05f7f2cc1a01f0c872f3cf43
git.kernel.org/stable/c/58e5735d1a... WEB
https://git.kernel.org/stable/c/58e5735d1a5373652f405a0c16e54ac04aaab0ad
git.kernel.org/stable/c/7081d46d32... WEB
https://git.kernel.org/stable/c/7081d46d32312f1a31f0e0e99c6835a394037599
git.kernel.org/stable/c/e62e322ea2... WEB
https://git.kernel.org/stable/c/e62e322ea20be78e346e4b49f9a6b9f03313af4c

Frequently Asked Questions

What is CVE-2026-43107?
CVE-2026-43107 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-131: Incorrect Calculation of Buffer Size.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-43107?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-43107?
CVE-2026-43107 has a CVSS v3.1 base score of 5.5 (MODERATE) with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2026-43107?
CVE-2026-43107 is classified under CWE-131: Incorrect Calculation of Buffer Size (The product does not correctly calculate the size to be used when allocating a buffer, which could lead to a buffer overflow.).
How can I check Maven dependencies for CVE-2026-43107?
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 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-v6vr-f94r-r434",
  "modified" : "2026-05-11T18:31:36Z",
  "published" : "2026-05-06T12:30:27Z",
  "aliases" : [ "CVE-2026-43107" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: account XFRMA_IF_ID in aevent size calculation\n\nxfrm_get_ae() allocates the reply skb with xfrm_aevent_msgsize(), then\nbuild_aevent() appends attributes including XFRMA_IF_ID when x->if_id is\nset.\n\nxfrm_aevent_msgsize() does not include space for XFRMA_IF_ID. For states\nwith if_id, build_aevent() can fail with -EMSGSIZE and hit BUG_ON(err < 0)\nin xfrm_get_ae(), turning a malformed netlink interaction into a kernel\npanic.\n\nAccount XFRMA_IF_ID in the size calculation unconditionally and replace\nthe BUG_ON with normal error unwinding.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-43107"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/2c41283d94af943a05f7f2cc1a01f0c872f3cf43"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/58e5735d1a5373652f405a0c16e54ac04aaab0ad"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/7081d46d32312f1a31f0e0e99c6835a394037599"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/e62e322ea20be78e346e4b49f9a6b9f03313af4c"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-131" ],
    "severity" : "MODERATE",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-05-06T10:16:24Z"
  }
}