CVE-2026-63992: Software Security Vulnerability Vulnerability

CRITICAL
Advisory Identifier: GHSA-9cmp-wxh9-77q4
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CVSS 9.1
CWE-125
Published
Advisory Summary

CVE-2026-63992 is a CRITICAL (CVSS 9.1) security vulnerability vulnerability (CWE-125: Out-of-bounds Read) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product reads data past the end, or before the beginning, of the intended buffer.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-63992 at a Glance

CVE Identifier CVE-2026-63992
GHSA Identifier GHSA-9cmp-wxh9-77q4
Severity CRITICAL
CVSS v3.1 Base Score 9.1
CWE Classification CWE-125: Out-of-bounds Read
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 9.1

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:N/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 None (I:N)
Availability High (A:H)

How to Fix CVE-2026-63992

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-2026-63992, 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-125: Out-of-bounds Read, where the product reads data past the end, or before the beginning, of the intended buffer. 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: tunnels: do not assume transport header in iptunnel_pmtud_check_icmp() In some cases, iptunnel_pmtud_check_icmp() can be called while skb transport header is not set. This triggers an out-of-bound access, because (typeof(skb->transport_header))~0U is 65535. Access the icmp header based on IPv4 network header, after making sure icmp->type is present in skb linear part. Note that iptunnel_pmtud_check_icmpv6()) is fine.

References

NVD — CVE-2026-63992 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-63992
git.kernel.org/stable/c/43368636c6... WEB
https://git.kernel.org/stable/c/43368636c663cff6e59dde93cf4b8e43ac28eb93
git.kernel.org/stable/c/509323077e... WEB
https://git.kernel.org/stable/c/509323077ef79a26ba0c60bb556e45c12c398b2d
git.kernel.org/stable/c/5a92cb45e3... WEB
https://git.kernel.org/stable/c/5a92cb45e34749865d03daf8d3500f77b5f6644c
git.kernel.org/stable/c/7f4f7efe7f... WEB
https://git.kernel.org/stable/c/7f4f7efe7f30edd29c4988de01728bf2398217e4
git.kernel.org/stable/c/a096b6e34f... WEB
https://git.kernel.org/stable/c/a096b6e34f602950af9a2b0856cd93a5f4c276d7
git.kernel.org/stable/c/c7b7ec3e69... WEB
https://git.kernel.org/stable/c/c7b7ec3e69e673c0d6b57f74d21da50c485c598e
git.kernel.org/stable/c/cb549df9ce... WEB
https://git.kernel.org/stable/c/cb549df9ce4ee15c9d5b19ddab12cf2128e4313c
git.kernel.org/stable/c/e917d0c69f... WEB
https://git.kernel.org/stable/c/e917d0c69f01af2bb4fbea2b66d560a53b3ac7ec

Frequently Asked Questions

What is CVE-2026-63992?
CVE-2026-63992 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-125: Out-of-bounds Read.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-63992?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-63992?
CVE-2026-63992 has a CVSS v3.1 base score of 9.1 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H.
What CWE is associated with CVE-2026-63992?
CVE-2026-63992 is classified under CWE-125: Out-of-bounds Read (The product reads data past the end, or before the beginning, of the intended buffer.).
How can I check Maven dependencies for CVE-2026-63992?
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 
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  "id" : "GHSA-9cmp-wxh9-77q4",
  "modified" : "2026-07-20T15:31:54Z",
  "published" : "2026-07-19T18:31:48Z",
  "aliases" : [ "CVE-2026-63992" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\ntunnels: do not assume transport header in iptunnel_pmtud_check_icmp()\n\nIn some cases, iptunnel_pmtud_check_icmp() can be called while\nskb transport header is not set.\n\nThis triggers an out-of-bound access, because\n(typeof(skb->transport_header))~0U is 65535.\n\nAccess the icmp header based on IPv4 network header,\nafter making sure icmp->type is present in skb linear part.\n\nNote that iptunnel_pmtud_check_icmpv6()) is fine.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H"
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  "database_specific" : {
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    "severity" : "CRITICAL",
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    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-07-19T16:17:38Z"
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}