CVE-2026-45999: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-xqmq-2p4j-99x8
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CVSS 7.1
CWE-191
Published
Advisory Summary

CVE-2026-45999 is a HIGH (CVSS 7.1) security vulnerability vulnerability (CWE-191: Integer Underflow (Wrap or Wraparound)) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-45999 at a Glance

CVE Identifier CVE-2026-45999
GHSA Identifier GHSA-xqmq-2p4j-99x8
Severity HIGH
CVSS v3.1 Base Score 7.1
CWE Classification CWE-191: Integer Underflow (Wrap or Wraparound)
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:N/UI:R/S:U/C:H/I:N/A:H).

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

How to Fix CVE-2026-45999

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-2026-45999, 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-191: Integer Underflow (Wrap or Wraparound), where the product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result. 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: erofs: fix unsigned underflow in z_erofs_lz4_handle_overlap() Some crafted images can have illegal (!partial_decoding && m_llen < m_plen) extents, and the LZ4 inplace decompression path can be wrongly hit, but it cannot handle (outpages < inpages) properly: "outpages - inpages" wraps to a large value and the subsequent rq->out[] access reads past the decompressed_pages array. However, such crafted cases can correctly result in a corruption report in the normal LZ4 non-inplace path. Let's add an additional check to fix this for backporting. Reproducible image (base64-encoded gzipped blob): H4sIAJGR12kCA+3SPUoDQRgG4MkmkkZk8QRbRFIIi9hbpEjrHQI5ghfwCN5BLCzTGtLbBI+g dilSJo1CnIm7GEXFxhT6PDDwfrs73/ywIQD/1ePD4r7Ou6ETsrq4mu7XcWfj++Pb58nJU/9i PNtbjhan04/9GtX4qVYc814WDqt6FaX5s+ZwXXeq52lndT6IuVvlblytLMvh4Gzwaf90nsvz 2DF/21+20T/ldgp5s1jXRaN4t/8izsy/OUB6e/Qa79r+JwAAAAAAAL52vQVuGQAAAP6+my1w ywAAAAAAAADwu14ATsEYtgBQAAA= $ mount -t erofs -o cache_strategy=disabled foo.erofs /mnt $ dd if=/mnt/data of=/dev/null bs=4096 count=1

References

NVD — CVE-2026-45999 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-45999
git.kernel.org/stable/c/118ff71ff0... WEB
https://git.kernel.org/stable/c/118ff71ff09ebaf323a09af9e911517321a299f4
git.kernel.org/stable/c/21e161de2d... WEB
https://git.kernel.org/stable/c/21e161de2dc660b1bb70ef5b156ab8e6e1cca3ab
git.kernel.org/stable/c/43a878639b... WEB
https://git.kernel.org/stable/c/43a878639b90e9721ffa5eb616a7e6d8454adef3
git.kernel.org/stable/c/778acd52e9... WEB
https://git.kernel.org/stable/c/778acd52e9497806fbd2cea7f770c41d6850fc48
git.kernel.org/stable/c/bbbbb3f0d7... WEB
https://git.kernel.org/stable/c/bbbbb3f0d7864238a8da2a94cd6ec013fee06a2e
git.kernel.org/stable/c/c9ce18e6bb... WEB
https://git.kernel.org/stable/c/c9ce18e6bb2c467ec85756dc7989b547b7584fee
git.kernel.org/stable/c/f1374fa6e5... WEB
https://git.kernel.org/stable/c/f1374fa6e57fd836623668d782ded9244cfd2938

Frequently Asked Questions

What is CVE-2026-45999?
CVE-2026-45999 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-191: Integer Underflow (Wrap or Wraparound).
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-45999?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-45999?
CVE-2026-45999 has a CVSS v3.1 base score of 7.1 (HIGH) with vector string CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H.
What CWE is associated with CVE-2026-45999?
CVE-2026-45999 is classified under CWE-191: Integer Underflow (Wrap or Wraparound) (The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result.).
How can I check Maven dependencies for CVE-2026-45999?
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-xqmq-2p4j-99x8",
  "modified" : "2026-06-19T15:33:12Z",
  "published" : "2026-05-27T15:33:20Z",
  "aliases" : [ "CVE-2026-45999" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nerofs: fix unsigned underflow in z_erofs_lz4_handle_overlap()\n\nSome crafted images can have illegal (!partial_decoding &&\nm_llen < m_plen) extents, and the LZ4 inplace decompression path\ncan be wrongly hit, but it cannot handle (outpages < inpages)\nproperly: \"outpages - inpages\" wraps to a large value and\nthe subsequent rq->out[] access reads past the decompressed_pages\narray.\n\nHowever, such crafted cases can correctly result in a corruption\nreport in the normal LZ4 non-inplace path.\n\nLet's add an additional check to fix this for backporting.\n\nReproducible image (base64-encoded gzipped blob):\n\nH4sIAJGR12kCA+3SPUoDQRgG4MkmkkZk8QRbRFIIi9hbpEjrHQI5ghfwCN5BLCzTGtLbBI+g\ndilSJo1CnIm7GEXFxhT6PDDwfrs73/ywIQD/1ePD4r7Ou6ETsrq4mu7XcWfj++Pb58nJU/9i\nPNtbjhan04/9GtX4qVYc814WDqt6FaX5s+ZwXXeq52lndT6IuVvlblytLMvh4Gzwaf90nsvz\n2DF/21+20T/ldgp5s1jXRaN4t/8izsy/OUB6e/Qa79r+JwAAAAAAAL52vQVuGQAAAP6+my1w\nywAAAAAAAADwu14ATsEYtgBQAAA=\n\n$ mount -t erofs -o cache_strategy=disabled foo.erofs /mnt\n$ dd if=/mnt/data of=/dev/null bs=4096 count=1",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
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  }, {
    "type" : "WEB",
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  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/21e161de2dc660b1bb70ef5b156ab8e6e1cca3ab"
  }, {
    "type" : "WEB",
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  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/778acd52e9497806fbd2cea7f770c41d6850fc48"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/bbbbb3f0d7864238a8da2a94cd6ec013fee06a2e"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/c9ce18e6bb2c467ec85756dc7989b547b7584fee"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/f1374fa6e57fd836623668d782ded9244cfd2938"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-191" ],
    "severity" : "HIGH",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-05-27T14:17:17Z"
  }
}