CVE-2026-43304: Software Security Vulnerability Vulnerability

CRITICAL
Advisory Identifier: GHSA-h4fr-xr6m-wwp8
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CVSS 9.8
CWE-121
Published
Advisory Summary

CVE-2026-43304 is a CRITICAL (CVSS 9.8) security vulnerability vulnerability (CWE-121: Stack-based Buffer Overflow) affecting Software libraries in the Maven ecosystem. The weakness occurs when a stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).. Remediation is available in the latest vendor maintenance releases.

CVE-2026-43304 at a Glance

CVE Identifier CVE-2026-43304
GHSA Identifier GHSA-h4fr-xr6m-wwp8
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-121: Stack-based Buffer Overflow
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-2026-43304

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-2026-43304, 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-121: Stack-based Buffer Overflow, where a stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). 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: libceph: define and enforce CEPH_MAX_KEY_LEN When decoding the key, verify that the key material would fit into a fixed-size buffer in process_auth_done() and generally has a sane length. The new CEPH_MAX_KEY_LEN check replaces the existing check for a key with no key material which is a) not universal since CEPH_CRYPTO_NONE has to be excluded and b) doesn't provide much value since a smaller than needed key is just as invalid as no key -- this has to be handled elsewhere anyway.

References

NVD — CVE-2026-43304 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-43304
git.kernel.org/stable/c/1b275bd49e... WEB
https://git.kernel.org/stable/c/1b275bd49e58752efb83767a5d1aed41356c5e64
git.kernel.org/stable/c/6405e8c680... WEB
https://git.kernel.org/stable/c/6405e8c680974bb74e2c98d5249fb52c7b12a6c6
git.kernel.org/stable/c/8d745d38c8... WEB
https://git.kernel.org/stable/c/8d745d38c88ecbed95f6b2b39857bf89f35a3244
git.kernel.org/stable/c/ac431d597a... WEB
https://git.kernel.org/stable/c/ac431d597a9bdfc2ba6b314813f29a6ef2b4a3bf
git.kernel.org/stable/c/c1a0f5f1e5... WEB
https://git.kernel.org/stable/c/c1a0f5f1e5e7e98c36a362ec3d1fcfd9932931ed
git.kernel.org/stable/c/d82467c07b... WEB
https://git.kernel.org/stable/c/d82467c07b03a27c3c5469b62bb3b726305a80bb
git.kernel.org/stable/c/e1dc45d979... WEB
https://git.kernel.org/stable/c/e1dc45d97975f9db65694d234fbddf1915176e16

Frequently Asked Questions

What is CVE-2026-43304?
CVE-2026-43304 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-121: Stack-based Buffer Overflow.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-43304?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-43304?
CVE-2026-43304 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-2026-43304?
CVE-2026-43304 is classified under CWE-121: Stack-based Buffer Overflow (A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).).
How can I check Maven dependencies for CVE-2026-43304?
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-h4fr-xr6m-wwp8",
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  "published" : "2026-05-08T15:31:22Z",
  "aliases" : [ "CVE-2026-43304" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: define and enforce CEPH_MAX_KEY_LEN\n\nWhen decoding the key, verify that the key material would fit into\na fixed-size buffer in process_auth_done() and generally has a sane\nlength.\n\nThe new CEPH_MAX_KEY_LEN check replaces the existing check for a key\nwith no key material which is a) not universal since CEPH_CRYPTO_NONE\nhas to be excluded and b) doesn't provide much value since a smaller\nthan needed key is just as invalid as no key -- this has to be handled\nelsewhere anyway.",
  "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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  "database_specific" : {
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    "nvd_published_at" : "2026-05-08T14:16:37Z"
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