CVE-2026-43258: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-rj9j-qfgp-687w
Share
CVSS 7.8
CWE-787
Published
Advisory Summary

CVE-2026-43258 is a HIGH (CVSS 7.8) 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-2026-43258 at a Glance

CVE Identifier CVE-2026-43258
GHSA Identifier GHSA-rj9j-qfgp-687w
Severity HIGH
CVSS v3.1 Base Score 7.8
CWE Classification CWE-787: Out-of-bounds Write
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 7.8

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:H/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 High (I:H)
Availability High (A:H)

How to Fix CVE-2026-43258

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-2026-43258, 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: alpha: fix user-space corruption during memory compaction Alpha systems can suffer sporadic user-space crashes and heap corruption when memory compaction is enabled. Symptoms include SIGSEGV, glibc allocator failures (e.g. "unaligned tcache chunk"), and compiler internal errors. The failures disappear when compaction is disabled or when using global TLB invalidation. The root cause is insufficient TLB shootdown during page migration. Alpha relies on ASN-based MM context rollover for instruction cache coherency, but this alone is not sufficient to prevent stale data or instruction translations from surviving migration. Fix this by introducing a migration-specific helper that combines: - MM context invalidation (ASN rollover), - immediate per-CPU TLB invalidation (TBI), - synchronous cross-CPU shootdown when required. The helper is used only by migration/compaction paths to avoid changing global TLB semantics. Additionally, update flush_tlb_other(), pte_clear(), to use READ_ONCE()/WRITE_ONCE() for correct SMP memory ordering. This fixes observed crashes on both UP and SMP Alpha systems.

References

NVD — CVE-2026-43258 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-43258
git.kernel.org/stable/c/03e42b5f7a... WEB
https://git.kernel.org/stable/c/03e42b5f7ad4c2c3db8bd384bab7990d5d53c90f
git.kernel.org/stable/c/bab8d762a8... WEB
https://git.kernel.org/stable/c/bab8d762a8dbb816b10011e13b87d1bca91e5f77
git.kernel.org/stable/c/d4ca6ca2c6... WEB
https://git.kernel.org/stable/c/d4ca6ca2c6f5a1d19d9014c5b36d96637846b5d6
git.kernel.org/stable/c/dd5712f337... WEB
https://git.kernel.org/stable/c/dd5712f3379cfe760267cdd28ff957d9ab4e51c7

Frequently Asked Questions

What is CVE-2026-43258?
CVE-2026-43258 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-2026-43258?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-43258?
CVE-2026-43258 has a CVSS v3.1 base score of 7.8 (HIGH) with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2026-43258?
CVE-2026-43258 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-2026-43258?
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-rj9j-qfgp-687w",
  "modified" : "2026-05-08T15:31:18Z",
  "published" : "2026-05-06T12:30:35Z",
  "aliases" : [ "CVE-2026-43258" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nalpha: fix user-space corruption during memory compaction\n\nAlpha systems can suffer sporadic user-space crashes and heap\ncorruption when memory compaction is enabled.\n\nSymptoms include SIGSEGV, glibc allocator failures (e.g. \"unaligned\ntcache chunk\"), and compiler internal errors. The failures disappear\nwhen compaction is disabled or when using global TLB invalidation.\n\nThe root cause is insufficient TLB shootdown during page migration.\nAlpha relies on ASN-based MM context rollover for instruction cache\ncoherency, but this alone is not sufficient to prevent stale data or\ninstruction translations from surviving migration.\n\nFix this by introducing a migration-specific helper that combines:\n  - MM context invalidation (ASN rollover),\n  - immediate per-CPU TLB invalidation (TBI),\n  - synchronous cross-CPU shootdown when required.\n\nThe helper is used only by migration/compaction paths to avoid changing\nglobal TLB semantics.\n\nAdditionally, update flush_tlb_other(), pte_clear(), to use\nREAD_ONCE()/WRITE_ONCE() for correct SMP memory ordering.\n\nThis fixes observed crashes on both UP and SMP Alpha systems.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-43258"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/03e42b5f7ad4c2c3db8bd384bab7990d5d53c90f"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/bab8d762a8dbb816b10011e13b87d1bca91e5f77"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/d4ca6ca2c6f5a1d19d9014c5b36d96637846b5d6"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/dd5712f3379cfe760267cdd28ff957d9ab4e51c7"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-787" ],
    "severity" : "HIGH",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-05-06T12:16:46Z"
  }
}