CVE-2026-31577: Software Security Vulnerability Vulnerability

MODERATE
Advisory Identifier: GHSA-9pgh-55q5-rvp6
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CVSS 5.5
CWE-476
Published
Advisory Summary

CVE-2026-31577 is a MODERATE (CVSS 5.5) 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-2026-31577 at a Glance

CVE Identifier CVE-2026-31577
GHSA Identifier GHSA-9pgh-55q5-rvp6
Severity MODERATE
CVSS v3.1 Base Score 5.5
CWE Classification CWE-476: NULL Pointer Dereference
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 5.5

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:N/I:N/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 None (C:N)
Integrity None (I:N)
Availability High (A:H)

How to Fix CVE-2026-31577

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-2026-31577, 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: nilfs2: fix NULL i_assoc_inode dereference in nilfs_mdt_save_to_shadow_map The DAT inode's btree node cache (i_assoc_inode) is initialized lazily during btree operations. However, nilfs_mdt_save_to_shadow_map() assumes i_assoc_inode is already initialized when copying dirty pages to the shadow map during GC. If NILFS_IOCTL_CLEAN_SEGMENTS is called immediately after mount before any btree operation has occurred on the DAT inode, i_assoc_inode is NULL leading to a general protection fault. Fix this by calling nilfs_attach_btree_node_cache() on the DAT inode in nilfs_dat_read() at mount time, ensuring i_assoc_inode is always initialized before any GC operation can use it.

References

NVD — CVE-2026-31577 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-31577
git.kernel.org/stable/c/41de342278... WEB
https://git.kernel.org/stable/c/41de342278ae025c99cc8d33648773f05e306cf1
git.kernel.org/stable/c/449ec5fc99... WEB
https://git.kernel.org/stable/c/449ec5fc99f45974525ba9eea16b6670c45cd363
git.kernel.org/stable/c/4a4e0328ed... WEB
https://git.kernel.org/stable/c/4a4e0328edd9e9755843787d28f16dd4165f8b48
git.kernel.org/stable/c/6637bbcfb5... WEB
https://git.kernel.org/stable/c/6637bbcfb59df5b732a79e5ab1a74886a0b93d59
git.kernel.org/stable/c/7318e35495... WEB
https://git.kernel.org/stable/c/7318e3549518ce8f14776a489d86488d80d7e2c8
git.kernel.org/stable/c/7902b1df15... WEB
https://git.kernel.org/stable/c/7902b1df1520a0880bcda7a3704cfacd17905a83
git.kernel.org/stable/c/837c7a59fb... WEB
https://git.kernel.org/stable/c/837c7a59fb58f81b0db33848357f6a5d0d1250ad
git.kernel.org/stable/c/97fb7afec4... WEB
https://git.kernel.org/stable/c/97fb7afec404912d967a7d4715f37742666b3084
git.kernel.org/stable/c/c36e206f30... WEB
https://git.kernel.org/stable/c/c36e206f302f1ddefed92d09ecbba070e1ae079e

Frequently Asked Questions

What is CVE-2026-31577?
CVE-2026-31577 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-2026-31577?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-31577?
CVE-2026-31577 has a CVSS v3.1 base score of 5.5 (MODERATE) with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2026-31577?
CVE-2026-31577 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-2026-31577?
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-9pgh-55q5-rvp6",
  "modified" : "2026-06-01T18:31:25Z",
  "published" : "2026-04-24T15:32:34Z",
  "aliases" : [ "CVE-2026-31577" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nnilfs2: fix NULL i_assoc_inode dereference in nilfs_mdt_save_to_shadow_map\n\nThe DAT inode's btree node cache (i_assoc_inode) is initialized lazily\nduring btree operations. However, nilfs_mdt_save_to_shadow_map()\nassumes i_assoc_inode is already initialized when copying dirty pages\nto the shadow map during GC.\n\nIf NILFS_IOCTL_CLEAN_SEGMENTS is called immediately after mount before\nany btree operation has occurred on the DAT inode, i_assoc_inode is\nNULL leading to a general protection fault.\n\nFix this by calling nilfs_attach_btree_node_cache() on the DAT inode\nin nilfs_dat_read() at mount time, ensuring i_assoc_inode is always\ninitialized before any GC operation can use it.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ ],
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  }, {
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    "url" : "https://git.kernel.org/stable/c/449ec5fc99f45974525ba9eea16b6670c45cd363"
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    "url" : "https://git.kernel.org/stable/c/c36e206f302f1ddefed92d09ecbba070e1ae079e"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-476" ],
    "severity" : "MODERATE",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-04-24T15:16:32Z"
  }
}