CVE-2026-63925: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-9hhm-2pf7-p38c
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CVSS 8.1
CWE-190
Published
Advisory Summary

CVE-2026-63925 is a HIGH (CVSS 8.1) security vulnerability vulnerability (CWE-190: Integer Overflow or Wraparound) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. this occurs when an integer value is incremented to a value that is too large to store in the associated representation. when this occurs, the value may become a very small or negative number.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-63925 at a Glance

CVE Identifier CVE-2026-63925
GHSA Identifier GHSA-9hhm-2pf7-p38c
Severity HIGH
CVSS v3.1 Base Score 8.1
CWE Classification CWE-190: Integer Overflow or Wraparound
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 8.1

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H).

Attack Vector Adjacent (AV:A)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2026-63925

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-2026-63925, 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-190: Integer Overflow or Wraparound, where the product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. this occurs when an integer value is incremented to a value that is too large to store in the associated representation. when this occurs, the value may become a very small or negative number. 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: macsec: fix replay protection at XPN lower-PN wrap In macsec_post_decrypt(), when pn is U32_MAX, pn + 1 overflows u32 to 0 and the first branch never fires. If next_pn_halves.lower is also in the upper half, pn_same_half(pn, lower) is true and the XPN else-if does not fire either, leaving next_pn_halves unchanged. An attacker that captures the legitimate frame carrying pn == 0xFFFFFFFF on an XPN association can then replay it indefinitely, since lowest_pn never rises above the captured pn and macsec_decrypt() reconstructs the same IV. Extend the XPN else-if to also fire when pn + 1 wraps to 0, so receipt of pn == U32_MAX advances next_pn_halves to (upper + 1, 0).

References

NVD — CVE-2026-63925 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-63925
git.kernel.org/stable/c/23c0e230ea... WEB
https://git.kernel.org/stable/c/23c0e230eab397d7f68be2538790ac41d3bb91fd
git.kernel.org/stable/c/679e13a65e... WEB
https://git.kernel.org/stable/c/679e13a65e68a67c8b3c0467c02ee89157ec6f0f
git.kernel.org/stable/c/6d00f5c7e5... WEB
https://git.kernel.org/stable/c/6d00f5c7e5ff7ec4795b7f5f8ed88bd346641652
git.kernel.org/stable/c/79495a1b09... WEB
https://git.kernel.org/stable/c/79495a1b0944fe31ffd54b54b00211b493590d62
git.kernel.org/stable/c/d15130461d... WEB
https://git.kernel.org/stable/c/d15130461df388136b62a7b0ce9f66e7e2fa9ff1
git.kernel.org/stable/c/d55acbe577... WEB
https://git.kernel.org/stable/c/d55acbe577db892b60547b6ef1c020b359331a6d
git.kernel.org/stable/c/dd7306779c... WEB
https://git.kernel.org/stable/c/dd7306779c6ce1238f4cdc34f3c1f2246b854457
git.kernel.org/stable/c/e68842b335... WEB
https://git.kernel.org/stable/c/e68842b3356471ba56c882209f324613dac47f64

Frequently Asked Questions

What is CVE-2026-63925?
CVE-2026-63925 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-190: Integer Overflow or Wraparound.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-63925?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-63925?
CVE-2026-63925 has a CVSS v3.1 base score of 8.1 (HIGH) with vector string CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H.
What CWE is associated with CVE-2026-63925?
CVE-2026-63925 is classified under CWE-190: Integer Overflow or Wraparound (The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.).
How can I check Maven dependencies for CVE-2026-63925?
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-9hhm-2pf7-p38c",
  "modified" : "2026-07-20T15:31:52Z",
  "published" : "2026-07-19T18:31:46Z",
  "aliases" : [ "CVE-2026-63925" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nmacsec: fix replay protection at XPN lower-PN wrap\n\nIn macsec_post_decrypt(), when pn is U32_MAX, pn + 1 overflows u32 to 0\nand the first branch never fires. If next_pn_halves.lower is also in the\nupper half, pn_same_half(pn, lower) is true and the XPN else-if does not\nfire either, leaving next_pn_halves unchanged. An attacker that captures\nthe legitimate frame carrying pn == 0xFFFFFFFF on an XPN association\ncan then replay it indefinitely, since lowest_pn never rises above\nthe captured pn and macsec_decrypt() reconstructs the same IV.\n\nExtend the XPN else-if to also fire when pn + 1 wraps to 0, so receipt\nof pn == U32_MAX advances next_pn_halves to (upper + 1, 0).",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H"
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    "url" : "https://git.kernel.org/stable/c/23c0e230eab397d7f68be2538790ac41d3bb91fd"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/679e13a65e68a67c8b3c0467c02ee89157ec6f0f"
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  "database_specific" : {
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    "severity" : "HIGH",
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    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-07-19T16:17:10Z"
  }
}