CVE-2026-31657: Software Security Vulnerability Vulnerability

CRITICAL
Advisory Identifier: GHSA-w24x-3wrx-8q34
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CVSS 9.8
CWE-476 CWE-416
Published
Advisory Summary

CVE-2026-31657 is a CRITICAL (CVSS 9.8) security vulnerability vulnerability (CWE-476: NULL Pointer Dereference) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product dereferences a pointer that it expects to be valid but is null.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-31657 at a Glance

CVE Identifier CVE-2026-31657
GHSA Identifier GHSA-w24x-3wrx-8q34
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-476: NULL Pointer Dereference
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 9.8

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
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-2026-31657

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-2026-31657, 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-476: NULL Pointer Dereference, where the product dereferences a pointer that it expects to be valid but is null. 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: batman-adv: hold claim backbone gateways by reference batadv_bla_add_claim() can replace claim->backbone_gw and drop the old gateway's last reference while readers still follow the pointer. The netlink claim dump path dereferences claim->backbone_gw->orig and takes claim->backbone_gw->crc_lock without pinning the underlying backbone gateway. batadv_bla_check_claim() still has the same naked pointer access pattern. Reuse batadv_bla_claim_get_backbone_gw() in both readers so they operate on a stable gateway reference until the read-side work is complete. This keeps the dump and claim-check paths aligned with the lifetime rules introduced for the other BLA claim readers.

References

NVD — CVE-2026-31657 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-31657
git.kernel.org/stable/c/1f2dc36c29... WEB
https://git.kernel.org/stable/c/1f2dc36c297d27733f1b380ea644cf15a361bd7b
git.kernel.org/stable/c/2f55b58b5a... WEB
https://git.kernel.org/stable/c/2f55b58b5a0bbed192d60c444a45a49cdf1b545f
git.kernel.org/stable/c/4dee4c0688... WEB
https://git.kernel.org/stable/c/4dee4c0688443aaf5bbec74aa203c851d1d53c35
git.kernel.org/stable/c/5202f071b3... WEB
https://git.kernel.org/stable/c/5202f071b367ffbc8e279fc7a00db14f5e587f52
git.kernel.org/stable/c/69d1ce9c72... WEB
https://git.kernel.org/stable/c/69d1ce9c72eca91203ffdb8d08bacd511100aec6
git.kernel.org/stable/c/7962b52222... WEB
https://git.kernel.org/stable/c/7962b522222628596ca9ecc8722efc95367aadbd
git.kernel.org/stable/c/82d8701b2c... WEB
https://git.kernel.org/stable/c/82d8701b2c930d0e96b0dbc9115a218d791cb0d2
git.kernel.org/stable/c/f4858832dd... WEB
https://git.kernel.org/stable/c/f4858832ddef2f39f21e30b7226bbcd3c4b2bc96

Frequently Asked Questions

What is CVE-2026-31657?
CVE-2026-31657 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-476: NULL Pointer Dereference.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-31657?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-31657?
CVE-2026-31657 has a CVSS v3.1 base score of 9.8 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2026-31657?
CVE-2026-31657 is classified under CWE-476: NULL Pointer Dereference (The product dereferences a pointer that it expects to be valid but is NULL.).
How can I check Maven dependencies for CVE-2026-31657?
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-w24x-3wrx-8q34",
  "modified" : "2026-06-01T18:31:28Z",
  "published" : "2026-04-24T15:32:36Z",
  "aliases" : [ "CVE-2026-31657" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: hold claim backbone gateways by reference\n\nbatadv_bla_add_claim() can replace claim->backbone_gw and drop the old\ngateway's last reference while readers still follow the pointer.\n\nThe netlink claim dump path dereferences claim->backbone_gw->orig and\ntakes claim->backbone_gw->crc_lock without pinning the underlying\nbackbone gateway. batadv_bla_check_claim() still has the same naked\npointer access pattern.\n\nReuse batadv_bla_claim_get_backbone_gw() in both readers so they operate\non a stable gateway reference until the read-side work is complete.\nThis keeps the dump and claim-check paths aligned with the lifetime\nrules introduced for the other BLA claim readers.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
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  "affected" : [ ],
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    "url" : "https://git.kernel.org/stable/c/1f2dc36c297d27733f1b380ea644cf15a361bd7b"
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    "url" : "https://git.kernel.org/stable/c/2f55b58b5a0bbed192d60c444a45a49cdf1b545f"
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  "database_specific" : {
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    "severity" : "CRITICAL",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-04-24T15:16:45Z"
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}