CVE-2026-80521: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-g8mr-r59r-2xmq
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CVSS 7.8
Published
Advisory Summary

CVE-2026-80521 is a HIGH (CVSS 7.8) security vulnerability vulnerability (General Security Weakness) affecting Software libraries in the Maven ecosystem. Remediation is available in the latest vendor maintenance releases.

CVE-2026-80521 at a Glance

CVE Identifier CVE-2026-80521
GHSA Identifier GHSA-g8mr-r59r-2xmq
Severity HIGH
CVSS v3.1 Base Score 7.8
CWE Classification General Security Weakness
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 7.8

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:H/I:H/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 High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2026-80521

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-2026-80521, 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: af_unix: Unlink scc_entry in unix_del_edge(). Kyle Zeng reported that GC could free a dead SCC partially. The scenario is as follows: 1) Create two SCCs: X -. A <-> B ^--' 2) Run the following concurrently: 2-1) send() sk-B to sk-B from sk-X 2-2) close() both A and B At 2-1), there is a small window where unix_add_edges() publishes a new edge (B <-> B) to GC but its skb is not queued by skb_queue_tail(). If 2-2) completes before skb_queue_tail() and GC is triggered, it judges A <-> B as dead, but B is not freed because GC cannot collect the not-yet-queued skb holding the B <-> B edge. X -. A <-> B -. This edge is visible ^--' ^..' but skb is not This itself is not a problem since the next GC run will judge B as dead as well and free it finally. X -. A <.> B -. ^--' ^--' However, X's SCC forces the next GC to call unix_walk_scc_fast(), and it iterates over A through B's scc_entry. Let's unlink scc_entry before freeing the vertex in unix_del_edge().

References

NVD — CVE-2026-80521 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-80521
git.kernel.org/stable/c/1293fd69a5... WEB
https://git.kernel.org/stable/c/1293fd69a50d188a5788b08ba3741a3e86be1608
git.kernel.org/stable/c/2b6c284269... WEB
https://git.kernel.org/stable/c/2b6c2842692d08e7acaf32d1eb47f95def35f3fe
git.kernel.org/stable/c/594d905195... WEB
https://git.kernel.org/stable/c/594d905195024b228c962627ae5ae7c17bd582a4
git.kernel.org/stable/c/6fda5c51b8... WEB
https://git.kernel.org/stable/c/6fda5c51b8e43a8440f76e65c89d9f95ddb2ef33
git.kernel.org/stable/c/e3702470ce... WEB
https://git.kernel.org/stable/c/e3702470ced94fad74d71e2232f022d2eb752a6d
git.kernel.org/stable/c/fe198b0778... WEB
https://git.kernel.org/stable/c/fe198b077864feafd4aa4b33b1a5ce26f50195a2

Frequently Asked Questions

What is CVE-2026-80521?
CVE-2026-80521 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-2026-80521?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-80521?
CVE-2026-80521 has a CVSS v3.1 base score of 7.8 (HIGH) with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2026-80521?
CVE-2026-80521 is classified under General Security Weakness.
How can I check Maven dependencies for CVE-2026-80521?
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-g8mr-r59r-2xmq",
  "modified" : "2026-10-03T12:31:04Z",
  "published" : "2026-08-27T06:31:31Z",
  "aliases" : [ "CVE-2026-80521" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\naf_unix: Unlink scc_entry in unix_del_edge().\n\nKyle Zeng reported that GC could free a dead SCC partially.\n\nThe scenario is as follows:\n\n   1) Create two SCCs:\n\n       X -.   A <-> B\n       ^--'\n\n   2) Run the following concurrently:\n\n      2-1) send() sk-B to sk-B from sk-X\n      2-2) close() both A and B\n\nAt 2-1), there is a small window where unix_add_edges()\npublishes a new edge (B <-> B) to GC but its skb is not queued\nby skb_queue_tail().\n\nIf 2-2) completes before skb_queue_tail() and GC is triggered,\nit judges A <-> B as dead, but B is not freed because GC cannot\ncollect the not-yet-queued skb holding the B <-> B edge.\n\n       X -.   A <-> B -. This edge is visible\n       ^--'         ^..'  but skb is not\n\nThis itself is not a problem since the next GC run will judge\nB as dead as well and free it finally.\n\n       X -.   A <.> B -.\n       ^--'         ^--'\n\nHowever, X's SCC forces the next GC to call unix_walk_scc_fast(),\nand it iterates over A through B's scc_entry.\n\nLet's unlink scc_entry before freeing the vertex in unix_del_edge().",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-80521"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/1293fd69a50d188a5788b08ba3741a3e86be1608"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/2b6c2842692d08e7acaf32d1eb47f95def35f3fe"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/594d905195024b228c962627ae5ae7c17bd582a4"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/6fda5c51b8e43a8440f76e65c89d9f95ddb2ef33"
  }, {
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    "url" : "https://git.kernel.org/stable/c/e3702470ced94fad74d71e2232f022d2eb752a6d"
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    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/fe198b077864feafd4aa4b33b1a5ce26f50195a2"
  } ],
  "database_specific" : {
    "cwe_ids" : [ ],
    "severity" : "HIGH",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-08-26T15:17:05Z"
  }
}