CVE-2026-90237: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-9xwh-87xc-mh2g
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CVSS 7.8
Published
Advisory Summary

CVE-2026-90237 is a HIGH (CVSS 7.8) security vulnerability vulnerability (General Security Weakness) affecting Software libraries in the Maven ecosystem. Remediation is available in the latest vendor maintenance releases.

CVE-2026-90237 at a Glance

CVE Identifier CVE-2026-90237
GHSA Identifier GHSA-9xwh-87xc-mh2g
Severity HIGH
CVSS v3.1 Base Score 7.8
CWE Classification General Security Weakness
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-2026-90237

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-2026-90237, 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: netfilter: nft_ct: move custom expectation support to helper Originally, the ct expectation support called nf_ct_helper_ext_add() for confirmed conntracks, which is invalid, triggering a splat. This was fixed by commit 1710eb913bdc ("netfilter: nft_ct: skip expectations for confirmed conntrack") which restricted it to unconfirmed conntracks. However, early insertion of expectations into the expectations list when the conntrack is unconfirmed leads to stale entries pointing to the wrong hlist_head through .pprev due to ct extension reallocation. Commit 7c9664351980 ("netfilter: move nat hlist_head to nf_conn") moved the nat hlist_head to nf_conn for this reason: 1. ... 2. When reallocation of extension area occurs we need to fixup the bysource hash head via hlist_replace_rcu. I'd rather not increase the size of the struct nf_conn for this feature has very limited scope: only one expectation can be created at a time given expect_clash() will make nf_ct_expect_related() reports EBUSY. For this reason, relax nf_ct_expect_related() not to drop packets in case expectation creation fails, therefore, expectation creation becomes best effort. To address this issue, add an internal ct helper and attach it to the conntrack entry to streamline the custom ct expectation support with existing ct helpers. Expose a new nf_conntrack_helper_release() function to release the internal helper that is allocated and attached to the conntrack entry to create the custom expectations. The nft_ct module removal always waits for rcu grace period, then the NULL helper callback is observed after this. This patch also restricts the creation of expectations to different helpers other than this custom helper that is created for this type of expectations.

References

NVD — CVE-2026-90237 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-90237
git.kernel.org/stable/c/3679da4ad8... WEB
https://git.kernel.org/stable/c/3679da4ad8be84cddaf40bc307fef1fe13e051ff
git.kernel.org/stable/c/af3fe52fd1... WEB
https://git.kernel.org/stable/c/af3fe52fd108fd38235e4813df62442ed0f1d8ff

Frequently Asked Questions

What is CVE-2026-90237?
CVE-2026-90237 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-2026-90237?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-90237?
CVE-2026-90237 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-2026-90237?
CVE-2026-90237 is classified under General Security Weakness.
How can I check Maven dependencies for CVE-2026-90237?
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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  "schema_version" : "1.4.0",
  "id" : "GHSA-9xwh-87xc-mh2g",
  "modified" : "2026-09-18T18:31:28Z",
  "published" : "2026-09-17T18:31:57Z",
  "aliases" : [ "CVE-2026-90237" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nft_ct: move custom expectation support to helper\n\nOriginally, the ct expectation support called nf_ct_helper_ext_add() for\nconfirmed conntracks, which is invalid, triggering a splat. This was\nfixed by commit 1710eb913bdc (\"netfilter: nft_ct: skip expectations for\nconfirmed conntrack\") which restricted it to unconfirmed conntracks.\n\nHowever, early insertion of expectations into the expectations list when\nthe conntrack is unconfirmed leads to stale entries pointing to the\nwrong hlist_head through .pprev due to ct extension reallocation.\n\nCommit 7c9664351980 (\"netfilter: move nat hlist_head to nf_conn\") moved\nthe nat hlist_head to nf_conn for this reason:\n\n     1. ...\n     2. When reallocation of extension area occurs we need to fixup the\n        bysource hash head via hlist_replace_rcu.\n\nI'd rather not increase the size of the struct nf_conn for this feature\nhas very limited scope: only one expectation can be created at a time\ngiven expect_clash() will make nf_ct_expect_related() reports EBUSY.\nFor this reason, relax nf_ct_expect_related() not to drop packets in\ncase expectation creation fails, therefore, expectation creation becomes\nbest effort.\n\nTo address this issue, add an internal ct helper and attach it to the\nconntrack entry to streamline the custom ct expectation support with\nexisting ct helpers.\n\nExpose a new nf_conntrack_helper_release() function to release the\ninternal helper that is allocated and attached to the conntrack entry to\ncreate the custom expectations. The nft_ct module removal always waits\nfor rcu grace period, then the NULL helper callback is observed after\nthis.\n\nThis patch also restricts the creation of expectations to different\nhelpers other than this custom helper that is created for this type of\nexpectations.",
  "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-2026-90237"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/3679da4ad8be84cddaf40bc307fef1fe13e051ff"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/af3fe52fd108fd38235e4813df62442ed0f1d8ff"
  } ],
  "database_specific" : {
    "cwe_ids" : [ ],
    "severity" : "HIGH",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-09-17T17:17:19Z"
  }
}