CVE-2026-80847: Software Security Vulnerability Vulnerability

UNKNOWN
Advisory Identifier: GHSA-m3f3-9j4q-c4f2
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Advisory Summary

CVE-2026-80847 is a security vulnerability vulnerability (General Security Weakness) affecting Software libraries in the Maven ecosystem. Remediation is available in the latest vendor maintenance releases.

CVE-2026-80847 at a Glance

CVE Identifier CVE-2026-80847
GHSA Identifier GHSA-m3f3-9j4q-c4f2
Severity N/A
CVSS v3.1 Base Score N/A
CWE Classification General Security Weakness
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

How to Fix CVE-2026-80847

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-2026-80847, 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: tcp: clamp route advmss to TCP_MIN_MSS tcp_select_initial_window() assumes that callers never pass an MSS smaller than 1, but route-derived advmss values can violate that assumption. A too-small explicit RTAX_ADVMSS is one way to get there, but it is not the only one. The same divide-by-zero can also be reached through the "default advmss" path when RTAX_ADVMSS is left at 0 and the effective advmss is later driven down by route MTU and min_adv_mss. Introduce a tcp_dst_advmss() helper that clamps route advmss to TCP_MIN_MSS before TCP consumes it, and use it in the TCP paths that derive advmss from dst metrics. This keeps the effective MSS from dropping to zero before tcp_select_initial_window() rounds the receive window.

References

NVD — CVE-2026-80847 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-80847
git.kernel.org/stable/c/31cf234936... WEB
https://git.kernel.org/stable/c/31cf2349361902769dc323e4dbf4b449795ec288
git.kernel.org/stable/c/6b8c20bf61... WEB
https://git.kernel.org/stable/c/6b8c20bf61924dfc38fefb145c9f7406d73fae53
git.kernel.org/stable/c/870a9e42ec... WEB
https://git.kernel.org/stable/c/870a9e42ecc6fe1b8c25d87af043cb0d9c178fe1
git.kernel.org/stable/c/cfb44c6028... WEB
https://git.kernel.org/stable/c/cfb44c6028e6f979720315e0772bbd0d4d33ed61
git.kernel.org/stable/c/eaf4af9bd6... WEB
https://git.kernel.org/stable/c/eaf4af9bd6975c2eff8d48820937c83032d968dc

Frequently Asked Questions

What is CVE-2026-80847?
CVE-2026-80847 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-2026-80847?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What CWE is associated with CVE-2026-80847?
CVE-2026-80847 is classified under General Security Weakness.
How can I check Maven dependencies for CVE-2026-80847?
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-m3f3-9j4q-c4f2",
  "modified" : "2026-09-21T15:31:31Z",
  "published" : "2026-09-04T18:31:28Z",
  "aliases" : [ "CVE-2026-80847" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: clamp route advmss to TCP_MIN_MSS\n\ntcp_select_initial_window() assumes that callers never pass an MSS\nsmaller than 1, but route-derived advmss values can violate that\nassumption.\n\nA too-small explicit RTAX_ADVMSS is one way to get there, but it is not\nthe only one. The same divide-by-zero can also be reached through the\n\"default advmss\" path when RTAX_ADVMSS is left at 0 and the effective\nadvmss is later driven down by route MTU and min_adv_mss.\n\nIntroduce a tcp_dst_advmss() helper that clamps route advmss to\nTCP_MIN_MSS before TCP consumes it, and use it in the TCP paths that\nderive advmss from dst metrics. This keeps the effective MSS from\ndropping to zero before tcp_select_initial_window() rounds the receive\nwindow.",
  "severity" : [ ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-80847"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/31cf2349361902769dc323e4dbf4b449795ec288"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/6b8c20bf61924dfc38fefb145c9f7406d73fae53"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/870a9e42ecc6fe1b8c25d87af043cb0d9c178fe1"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/cfb44c6028e6f979720315e0772bbd0d4d33ed61"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/eaf4af9bd6975c2eff8d48820937c83032d968dc"
  } ],
  "database_specific" : {
    "cwe_ids" : [ ],
    "severity" : null,
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-09-04T16:18:13Z"
  }
}