CVE-2026-74743: Software Security Vulnerability Vulnerability

CRITICAL
Advisory Identifier: GHSA-5qfp-9h7g-rcpm
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CVSS 9.8
Published
Advisory Summary

CVE-2026-74743 is a CRITICAL (CVSS 9.8) security vulnerability vulnerability (General Security Weakness) affecting Software libraries in the Maven ecosystem. Remediation is available in the latest vendor maintenance releases.

CVE-2026-74743 at a Glance

CVE Identifier CVE-2026-74743
GHSA Identifier GHSA-5qfp-9h7g-rcpm
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification General Security Weakness
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-2026-74743

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-2026-74743, 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: macvlan: inherit needed_headroom and needed_tailroom from lowerdev macvlan devices inherit hard_header_len from lowerdev during macvlan_init(), but leave needed_headroom and needed_tailroom set to 0. When the underlying lowerdev requires extra headroom or tailroom for headers/trailers (e.g. macsec, ipsec, wireguard, tunnels, or veth with rx headroom), upper layers calculating packet headroom and tailroom fail to reserve sufficient space. This can result in reallocation overhead, skb headroom underflows, or KASAN slab-use-after-free crashes when dev_hard_header() / macvlan_hard_header() prepends header data or when lower devices append tailroom. Fix this by: 1. Inheriting needed_headroom and needed_tailroom from lowerdev in macvlan_init(). 2. Propagating needed_headroom and needed_tailroom updates to attached macvlans in macvlan_device_event() when receiving NETDEV_FEAT_CHANGE events.

References

NVD — CVE-2026-74743 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-74743
git.kernel.org/stable/c/28afc87bd8... WEB
https://git.kernel.org/stable/c/28afc87bd8da0b3348bbbd834c8a89e83712cf5e
git.kernel.org/stable/c/7b0eb3e0f3... WEB
https://git.kernel.org/stable/c/7b0eb3e0f363ca79a3af9efd2e87c6258f11da2b
git.kernel.org/stable/c/8cd90e850e... WEB
https://git.kernel.org/stable/c/8cd90e850e434577bf6774778657d26d6995e53f
git.kernel.org/stable/c/8f6a05dbac... WEB
https://git.kernel.org/stable/c/8f6a05dbac05725e0786701eb04778c5bdbe4eaa
git.kernel.org/stable/c/96fa90b743... WEB
https://git.kernel.org/stable/c/96fa90b74385b7f2b0d97251dd43d5ee6ca44668
git.kernel.org/stable/c/bc9a00fb78... WEB
https://git.kernel.org/stable/c/bc9a00fb78e32bccc39d763bfd13a450705bac5d
git.kernel.org/stable/c/c2ef3f134b... WEB
https://git.kernel.org/stable/c/c2ef3f134b069c54b9cc95cce1a16c38c4939336
git.kernel.org/stable/c/cef51860be... WEB
https://git.kernel.org/stable/c/cef51860becd9700217c81732ca1eb1ea6ed6fe1

Frequently Asked Questions

What is CVE-2026-74743?
CVE-2026-74743 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-2026-74743?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-74743?
CVE-2026-74743 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-2026-74743?
CVE-2026-74743 is classified under General Security Weakness.
How can I check Maven dependencies for CVE-2026-74743?
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 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-5qfp-9h7g-rcpm",
  "modified" : "2026-10-03T12:31:04Z",
  "published" : "2026-08-27T06:31:30Z",
  "aliases" : [ "CVE-2026-74743" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nmacvlan: inherit needed_headroom and needed_tailroom from lowerdev\n\nmacvlan devices inherit hard_header_len from lowerdev during macvlan_init(),\nbut leave needed_headroom and needed_tailroom set to 0.\n\nWhen the underlying lowerdev requires extra headroom or tailroom for\nheaders/trailers (e.g. macsec, ipsec, wireguard, tunnels, or veth with rx\nheadroom), upper layers calculating packet headroom and tailroom fail to\nreserve sufficient space.\n\nThis can result in reallocation overhead, skb headroom underflows, or KASAN\nslab-use-after-free crashes when dev_hard_header() / macvlan_hard_header()\nprepends header data or when lower devices append tailroom.\n\nFix this by:\n1. Inheriting needed_headroom and needed_tailroom from lowerdev in macvlan_init().\n2. Propagating needed_headroom and needed_tailroom updates to attached macvlans\n   in macvlan_device_event() when receiving NETDEV_FEAT_CHANGE events.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-74743"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/28afc87bd8da0b3348bbbd834c8a89e83712cf5e"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/7b0eb3e0f363ca79a3af9efd2e87c6258f11da2b"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/8cd90e850e434577bf6774778657d26d6995e53f"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/8f6a05dbac05725e0786701eb04778c5bdbe4eaa"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/96fa90b74385b7f2b0d97251dd43d5ee6ca44668"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/bc9a00fb78e32bccc39d763bfd13a450705bac5d"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/c2ef3f134b069c54b9cc95cce1a16c38c4939336"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/cef51860becd9700217c81732ca1eb1ea6ed6fe1"
  } ],
  "database_specific" : {
    "cwe_ids" : [ ],
    "severity" : "CRITICAL",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-08-26T15:16:53Z"
  }
}