CVE-2026-43038: Software Security Vulnerability Vulnerability

CRITICAL

Advisory Identifier: GHSA-78m7-4xgc-xrrq

CVSS 9.8

Published 2026-05-01

Advisory Summary

CVE-2026-43038 is a CRITICAL (CVSS 9.8) security vulnerability vulnerability (CWE-843: Access of Resource Using Incompatible Type ('Type Confusion')) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product allocates or initializes a resource such as a pointer, object, or variable using one type, but it later accesses that resource using a type that is incompatible with the original type.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-43038 at a Glance

CVE Identifier CVE-2026-43038

GHSA Identifier GHSA-78m7-4xgc-xrrq

Severity CRITICAL

CVSS v3.1 Base Score 9.8

CWE Classification CWE-843: Access of Resource Using Incompatible Type ('Type Confusion')

Affected Product Software

Package Ecosystem Maven

Published Date 2026-05-01

Last Updated 2026-10-15

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-2026-43038

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-2026-43038, 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-843: Access of Resource Using Incompatible Type ('Type Confusion'), where the product allocates or initializes a resource such as a pointer, object, or variable using one type, but it later accesses that resource using a type that is incompatible with the original type. 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: ipv6: icmp: clear skb2->cb[] in ip6_err_gen_icmpv6_unreach() Sashiko AI-review observed: In ip6_err_gen_icmpv6_unreach(), the skb is an outer IPv4 ICMP error packet where its cb contains an IPv4 inet_skb_parm. When skb is cloned into skb2 and passed to icmp6_send(), it uses IP6CB(skb2). IP6CB interprets the IPv4 inet_skb_parm as an inet6_skb_parm. The cipso offset in inet_skb_parm.opt directly overlaps with dsthao in inet6_skb_parm at offset 18. If an attacker sends a forged ICMPv4 error with a CIPSO IP option, dsthao would be a non-zero offset. Inside icmp6_send(), mip6_addr_swap() is called and uses ipv6_find_tlv(skb, opt->dsthao, IPV6_TLV_HAO). This would scan the inner, attacker-controlled IPv6 packet starting at that offset, potentially returning a fake TLV without checking if the remaining packet length can hold the full 18-byte struct ipv6_destopt_hao. Could mip6_addr_swap() then perform a 16-byte swap that extends past the end of the packet data into skb_shared_info? Should the cb array also be cleared in ip6_err_gen_icmpv6_unreach() and ip6ip6_err() to prevent this? This patch implements the first suggestion. I am not sure if ip6ip6_err() needs to be changed. A separate patch would be better anyway.

References

NVD — CVE-2026-43038 NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-43038

access.redhat.com/errata/rhsa-2026:56... WEB

https://access.redhat.com/errata/RHSA-2026:56224

access.redhat.com/errata/rhsa-2026:56... WEB

https://access.redhat.com/errata/RHSA-2026:56225

Software Security Information SECURITY

https://access.redhat.com/security/cve/CVE-2026-43038

bugzilla.redhat.com/show_bug.cgi WEB

https://bugzilla.redhat.com/show_bug.cgi?id=2464397

cert-portal.siemens.com/productcert/html/ss... WEB

https://cert-portal.siemens.com/productcert/html/ssa-019113.html

cert-portal.siemens.com/productcert/html/ss... WEB

https://cert-portal.siemens.com/productcert/html/ssa-082556.html

cert-portal.siemens.com/productcert/html/ss... WEB

https://cert-portal.siemens.com/productcert/html/ssa-457936.html

git.kernel.org/stable/c/0452b6526b... WEB

https://git.kernel.org/stable/c/0452b6526b2f54b2413b9cb4ff1ea2ac542c99c7

git.kernel.org/stable/c/1ceeebd5bd... WEB

https://git.kernel.org/stable/c/1ceeebd5bd6d855b17a5df625109bfe29129d7cf

access.redhat.com/errata/rhsa-2026:22... WEB

https://access.redhat.com/errata/RHSA-2026:22900

git.kernel.org/stable/c/3d5127d998... WEB

https://git.kernel.org/stable/c/3d5127d998de617b130aae96b138dba22ac6a8a7

git.kernel.org/stable/c/86ab3e5567... WEB

https://git.kernel.org/stable/c/86ab3e55673a7a49a841838776f1ab18d23a67b5

git.kernel.org/stable/c/a2edbb6393... WEB

https://git.kernel.org/stable/c/a2edbb6393972a02114b6003953a5cef3104fada

git.kernel.org/stable/c/a4437faf13... WEB

https://git.kernel.org/stable/c/a4437faf135da293d16fcc4cc607316742bd0ebb

git.kernel.org/stable/c/c438ba0101... WEB

https://git.kernel.org/stable/c/c438ba010171b70bad22fc18b1d5bdc3627476e8

git.kernel.org/stable/c/e41953e7d1... WEB

https://git.kernel.org/stable/c/e41953e7d118e2702bcb217879c173d9d1d3cd4e

Software Security Information SECURITY

https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43038.json

access.redhat.com/errata/rhsa-2026:22... WEB

https://access.redhat.com/errata/RHSA-2026:22940

access.redhat.com/errata/rhsa-2026:22... WEB

https://access.redhat.com/errata/RHSA-2026:22964

access.redhat.com/errata/rhsa-2026:23... WEB

https://access.redhat.com/errata/RHSA-2026:23224

access.redhat.com/errata/rhsa-2026:23... WEB

https://access.redhat.com/errata/RHSA-2026:23237

access.redhat.com/errata/rhsa-2026:24... WEB

https://access.redhat.com/errata/RHSA-2026:24343

access.redhat.com/errata/rhsa-2026:25... WEB

https://access.redhat.com/errata/RHSA-2026:25120

access.redhat.com/errata/rhsa-2026:25... WEB

https://access.redhat.com/errata/RHSA-2026:25121

access.redhat.com/errata/rhsa-2026:25... WEB

https://access.redhat.com/errata/RHSA-2026:25533

access.redhat.com/errata/rhsa-2026:26... WEB

https://access.redhat.com/errata/RHSA-2026:26535

access.redhat.com/errata/rhsa-2026:30... WEB

https://access.redhat.com/errata/RHSA-2026:30129

access.redhat.com/errata/rhsa-2026:30... WEB

https://access.redhat.com/errata/RHSA-2026:30848

access.redhat.com/errata/rhsa-2026:55... WEB

https://access.redhat.com/errata/RHSA-2026:55618

access.redhat.com/errata/rhsa-2026:55... WEB

https://access.redhat.com/errata/RHSA-2026:55761

access.redhat.com/errata/rhsa-2026:55... WEB

https://access.redhat.com/errata/RHSA-2026:55762

access.redhat.com/errata/rhsa-2026:55... WEB

https://access.redhat.com/errata/RHSA-2026:55763

access.redhat.com/errata/rhsa-2026:55... WEB

https://access.redhat.com/errata/RHSA-2026:55837

Frequently Asked Questions

What is CVE-2026-43038?

CVE-2026-43038 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-843: Access of Resource Using Incompatible Type ('Type Confusion').

Which Software versions are affected?

Affected versions include releases prior to current release patches.

What version fixes CVE-2026-43038?

Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.

What is the CVSS score of CVE-2026-43038?

CVE-2026-43038 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-2026-43038?

CVE-2026-43038 is classified under CWE-843: Access of Resource Using Incompatible Type ('Type Confusion') (The product allocates or initializes a resource such as a pointer, object, or variable using one type, but it later accesses that resource using a type that is incompatible with the original type.).

How can I check Maven dependencies for CVE-2026-43038?

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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CVSS V3

9.8 CRITICAL

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)

Vector String

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Advisory Metadata

Source ID: GHSA-78m7-4xgc-xrrq
Schema Version: 1.4.0
Published: 2026-05-01 15:30
Last Modified: 2026-10-15 03:35
Database Record File: advisories/unreviewed/2026/05/GHSA-78m7-4xgc-xrrq/GHSA-78m7-4xgc-xrrq.json