CVE-2026-90203: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-3vc4-628m-7f5q
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CVSS 7.1
Published
Advisory Summary

CVE-2026-90203 is a HIGH (CVSS 7.1) security vulnerability vulnerability (General Security Weakness) affecting Software libraries in the Maven ecosystem. Remediation is available in the latest vendor maintenance releases.

CVE-2026-90203 at a Glance

CVE Identifier CVE-2026-90203
GHSA Identifier GHSA-3vc4-628m-7f5q
Severity HIGH
CVSS v3.1 Base Score 7.1
CWE Classification General Security Weakness
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-2026-90203

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-2026-90203, 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 General Security Weakness. 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: Squashfs: check block offset is not negative If a negative offset is read off disk (for example the offset into the decompressed fragment block), this will cause squashfs_copy_data() to perform an out of bounds access. Fix by checking if offset is negative, and returning 0. This matches existing behaviour where an offset beyond the block returns 0 bytes copied. To trigger this out of bounds access requires a crafted Squashfs filesystem and CAP_SYS_ADMIN to mount it. Unprivileged users will not be able to mount such a filesystem, but once mounted, an unprivileged user can trigger the out of bounds access by reading the crafted file with the negative offset.

References

NVD — CVE-2026-90203 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-90203
git.kernel.org/stable/c/3d2f0cb66c... WEB
https://git.kernel.org/stable/c/3d2f0cb66c909ea2312cdef465165bb9a3ba2d84
git.kernel.org/stable/c/95dadf366c... WEB
https://git.kernel.org/stable/c/95dadf366c117dcdca78a570e6832071deab1ecd
git.kernel.org/stable/c/b169185d5c... WEB
https://git.kernel.org/stable/c/b169185d5c672b989985c6c2e38cafab2548ba88
git.kernel.org/stable/c/bbb2218eb0... WEB
https://git.kernel.org/stable/c/bbb2218eb072b0a15dc063929200183bd23c2344
git.kernel.org/stable/c/c2a126fca8... WEB
https://git.kernel.org/stable/c/c2a126fca820ae74872da28de68dc74d4595dc4b
git.kernel.org/stable/c/d0a3729d46... WEB
https://git.kernel.org/stable/c/d0a3729d464fcf516416a41cf304c0c92126ee03
git.kernel.org/stable/c/e300eb5002... WEB
https://git.kernel.org/stable/c/e300eb5002925b29be803d2661af07266cfa267e
git.kernel.org/stable/c/e4afd90bc7... WEB
https://git.kernel.org/stable/c/e4afd90bc7bf3dd477970c6c42bdd29ad3fda7fe

Frequently Asked Questions

What is CVE-2026-90203?
CVE-2026-90203 is a security vulnerability in Software classified as a security vulnerability vulnerability under General Security Weakness.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-90203?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-90203?
CVE-2026-90203 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-2026-90203?
CVE-2026-90203 is classified under General Security Weakness.
How can I check Maven dependencies for CVE-2026-90203?
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-3vc4-628m-7f5q",
  "modified" : "2026-09-18T18:31:27Z",
  "published" : "2026-09-17T18:31:55Z",
  "aliases" : [ "CVE-2026-90203" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nSquashfs: check block offset is not negative\n\nIf a negative offset is read off disk (for example the offset into the\ndecompressed fragment block), this will cause squashfs_copy_data() to\nperform an out of bounds access.\n\nFix by checking if offset is negative, and returning 0.  This matches\nexisting behaviour where an offset beyond the block returns 0 bytes\ncopied.\n\nTo trigger this out of bounds access requires a crafted Squashfs\nfilesystem and CAP_SYS_ADMIN to mount it.  Unprivileged users will not be\nable to mount such a filesystem, but once mounted, an unprivileged user\ncan trigger the out of bounds access by reading the crafted file with the\nnegative offset.",
  "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",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-90203"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/3d2f0cb66c909ea2312cdef465165bb9a3ba2d84"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/95dadf366c117dcdca78a570e6832071deab1ecd"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/b169185d5c672b989985c6c2e38cafab2548ba88"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/bbb2218eb072b0a15dc063929200183bd23c2344"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/c2a126fca820ae74872da28de68dc74d4595dc4b"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/d0a3729d464fcf516416a41cf304c0c92126ee03"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/e300eb5002925b29be803d2661af07266cfa267e"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/e4afd90bc7bf3dd477970c6c42bdd29ad3fda7fe"
  } ],
  "database_specific" : {
    "cwe_ids" : [ ],
    "severity" : "HIGH",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-09-17T17:17:15Z"
  }
}