CVE-2026-74478: Software Security Vulnerability Vulnerability

CRITICAL
Advisory Identifier: GHSA-mhmm-jqvj-99w7
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CVSS 9.8
Published
Advisory Summary

CVE-2026-74478 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-2026-74478 at a Glance

CVE Identifier CVE-2026-74478
GHSA Identifier GHSA-mhmm-jqvj-99w7
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-2026-74478

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-2026-74478, 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: um: vector: fix use-after-free in vector_mmsg_rx() When vector_mmsg_rx() discards a packet whose overlay header fails verify_header(), it frees the skb and continues the loop: if (header_check < 0) { dev_kfree_skb_irq(skb); vp->estats.rx_encaps_errors++; continue; } The normal and short-packet paths fall through to the bottom of the loop body, which clears the consumed slot and advances the cursors: (*skbuff_vector) = NULL; mmsg_vector++; skbuff_vector++; The verify_header() < 0 path skips that via continue, so the freed skb is left in skbuff_vector[] and the cursors do not advance. The next iteration reads the same slot, gets the freed skb, and frees it again, producing a refcount underflow / use-after-free in the RX path. Discard the slot the same way the other paths do before continuing. Only transports whose verify_header() can return negative are affected: GRE and L2TPv3 do so on a cookie/session-id mismatch (raw/tap do not), so any peer on such a transport can trigger it without authentication.

References

NVD — CVE-2026-74478 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-74478
git.kernel.org/stable/c/180ff4c81f... WEB
https://git.kernel.org/stable/c/180ff4c81faf01ec4e06082c9daa7c40518ead89
git.kernel.org/stable/c/4b9601595e... WEB
https://git.kernel.org/stable/c/4b9601595e8b6b5d18878cac0aeabc687d241111
git.kernel.org/stable/c/67d58ab4f2... WEB
https://git.kernel.org/stable/c/67d58ab4f2ccf7145f3da07e025735a09c79de1b
git.kernel.org/stable/c/7dc9781e32... WEB
https://git.kernel.org/stable/c/7dc9781e320d664c9bdd50003c9acfddf363d1e1
git.kernel.org/stable/c/804b681002... WEB
https://git.kernel.org/stable/c/804b681002ead233abf49a3efd681f5468a835f9
git.kernel.org/stable/c/967c779c98... WEB
https://git.kernel.org/stable/c/967c779c9853d2a1cc9cd8e61d300250c348f3d9
git.kernel.org/stable/c/a7bc015bb7... WEB
https://git.kernel.org/stable/c/a7bc015bb798c525e7a82dd14225c6aeb994274b
git.kernel.org/stable/c/af421e9aed... WEB
https://git.kernel.org/stable/c/af421e9aed3920c7ac88c24daa48606c7112feca

Frequently Asked Questions

What is CVE-2026-74478?
CVE-2026-74478 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-2026-74478?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-74478?
CVE-2026-74478 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-2026-74478?
CVE-2026-74478 is classified under General Security Weakness.
How can I check Maven dependencies for CVE-2026-74478?
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-mhmm-jqvj-99w7",
  "modified" : "2026-08-19T18:32:28Z",
  "published" : "2026-08-15T15:30:33Z",
  "aliases" : [ "CVE-2026-74478" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\num: vector: fix use-after-free in vector_mmsg_rx()\n\nWhen vector_mmsg_rx() discards a packet whose overlay header fails\nverify_header(), it frees the skb and continues the loop:\n\n\tif (header_check < 0) {\n\t\tdev_kfree_skb_irq(skb);\n\t\tvp->estats.rx_encaps_errors++;\n\t\tcontinue;\n\t}\n\nThe normal and short-packet paths fall through to the bottom of the\nloop body, which clears the consumed slot and advances the cursors:\n\n\t(*skbuff_vector) = NULL;\n\tmmsg_vector++;\n\tskbuff_vector++;\n\nThe verify_header() < 0 path skips that via continue, so the freed skb\nis left in skbuff_vector[] and the cursors do not advance. The next\niteration reads the same slot, gets the freed skb, and frees it again,\nproducing a refcount underflow / use-after-free in the RX path.\n\nDiscard the slot the same way the other paths do before continuing.\n\nOnly transports whose verify_header() can return negative are affected:\nGRE and L2TPv3 do so on a cookie/session-id mismatch (raw/tap do not),\nso any peer on such a transport can trigger it without authentication.",
  "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-2026-74478"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/180ff4c81faf01ec4e06082c9daa7c40518ead89"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/4b9601595e8b6b5d18878cac0aeabc687d241111"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/67d58ab4f2ccf7145f3da07e025735a09c79de1b"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/7dc9781e320d664c9bdd50003c9acfddf363d1e1"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/804b681002ead233abf49a3efd681f5468a835f9"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/967c779c9853d2a1cc9cd8e61d300250c348f3d9"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/a7bc015bb798c525e7a82dd14225c6aeb994274b"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/af421e9aed3920c7ac88c24daa48606c7112feca"
  } ],
  "database_specific" : {
    "cwe_ids" : [ ],
    "severity" : "CRITICAL",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-08-15T13:17:52Z"
  }
}