CVE-2026-63913: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-8577-pmm3-chq2
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CVSS 8.2
CWE-20
Published
Advisory Summary

CVE-2026-63913 is a HIGH (CVSS 8.2) security vulnerability vulnerability (CWE-20: Improper Input Validation) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-63913 at a Glance

CVE Identifier CVE-2026-63913
GHSA Identifier GHSA-8577-pmm3-chq2
Severity HIGH
CVSS v3.1 Base Score 8.2
CWE Classification CWE-20: Improper Input Validation
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 8.2

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:N/I:L/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 None (C:N)
Integrity Low (I:L)
Availability High (A:H)

How to Fix CVE-2026-63913

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-2026-63913, 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-20: Improper Input Validation, where the product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. 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: netfilter: conntrack: tcp: do not force CLOSE on invalid-seq RST without direction check An unintended behavior in the TCP conntrack state machine allows a connection to be forced into the CLOSE state using an RST packet with an invalid sequence number. Specifically, after a SYN packet is observed, an RST with an invalid SEQ can transition the conntrack entry to TCP_CONNTRACK_CLOSE, regardless of whether the RST corresponds to the expected reply direction. The relevant code path assumes the RST is a response to an outgoing SYN, but does not validate packet direction or ensure that a matching SYN was actually sent in the opposite direction. As a result, a crafted packet sequence consisting of a SYN followed by an invalid-sequence RST can prematurely terminate an active NAT entry. This makes connection teardown easier than intended. So, tighten the state transition logic to ensure that RST-triggered CLOSE transitions only occur when the RST is a valid response to a previously observed SYN in the correct direction.

References

NVD — CVE-2026-63913 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-63913
git.kernel.org/stable/c/2006979a15... WEB
https://git.kernel.org/stable/c/2006979a15af5404bf932a325357683c0bac1656
git.kernel.org/stable/c/2bb6d82b58... WEB
https://git.kernel.org/stable/c/2bb6d82b586ea5a4cb73bbdd6b7432e96096bc77
git.kernel.org/stable/c/6476c17d53... WEB
https://git.kernel.org/stable/c/6476c17d536dbd321c073242e762ddb2713a1238
git.kernel.org/stable/c/b98ab51c45... WEB
https://git.kernel.org/stable/c/b98ab51c45c5608a1c19ce7fd17a3032469bb83f
git.kernel.org/stable/c/bed6e04be8... WEB
https://git.kernel.org/stable/c/bed6e04be8e6b9133d8b16d5a42d0e0ce674fa9a
git.kernel.org/stable/c/d67c6adee8... WEB
https://git.kernel.org/stable/c/d67c6adee8d1b65330d0174c4c367faba14e80a8
git.kernel.org/stable/c/f206def4e8... WEB
https://git.kernel.org/stable/c/f206def4e86d810f927ba1d8e322ea72b29bce58
git.kernel.org/stable/c/f5547bebc4... WEB
https://git.kernel.org/stable/c/f5547bebc416d56f56fb5b86dc20aabfa42165a0

Frequently Asked Questions

What is CVE-2026-63913?
CVE-2026-63913 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-20: Improper Input Validation.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-63913?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-63913?
CVE-2026-63913 has a CVSS v3.1 base score of 8.2 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H.
What CWE is associated with CVE-2026-63913?
CVE-2026-63913 is classified under CWE-20: Improper Input Validation (The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.).
How can I check Maven dependencies for CVE-2026-63913?
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-8577-pmm3-chq2",
  "modified" : "2026-07-20T15:31:50Z",
  "published" : "2026-07-19T18:31:45Z",
  "aliases" : [ "CVE-2026-63913" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: conntrack: tcp: do not force CLOSE on invalid-seq RST without direction check\n\nAn unintended behavior in the TCP conntrack state machine allows a\nconnection to be forced into the CLOSE state using an RST packet with an\ninvalid sequence number.\n\nSpecifically, after a SYN packet is observed, an RST with an invalid SEQ\ncan transition the conntrack entry to TCP_CONNTRACK_CLOSE, regardless of\nwhether the RST corresponds to the expected reply direction. The relevant\ncode path assumes the RST is a response to an outgoing SYN, but does not\nvalidate packet direction or ensure that a matching SYN was actually sent\nin the opposite direction.\n\nAs a result, a crafted packet sequence consisting of a SYN followed by an\ninvalid-sequence RST can prematurely terminate an active NAT entry. This\nmakes connection teardown easier than intended.\n\nSo, tighten the state transition logic to ensure that RST-triggered\nCLOSE transitions only occur when the RST is a valid response to a\npreviously observed SYN in the correct direction.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-63913"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/2006979a15af5404bf932a325357683c0bac1656"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/2bb6d82b586ea5a4cb73bbdd6b7432e96096bc77"
  }, {
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    "url" : "https://git.kernel.org/stable/c/6476c17d536dbd321c073242e762ddb2713a1238"
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    "type" : "WEB",
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  }, {
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    "url" : "https://git.kernel.org/stable/c/d67c6adee8d1b65330d0174c4c367faba14e80a8"
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    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/f206def4e86d810f927ba1d8e322ea72b29bce58"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/f5547bebc416d56f56fb5b86dc20aabfa42165a0"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-20" ],
    "severity" : "HIGH",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-07-19T16:17:09Z"
  }
}