CVE-2026-64088: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-r69h-9cf6-78mg
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CVSS 8.8
Published
Advisory Summary

CVE-2026-64088 is a HIGH (CVSS 8.8) security vulnerability vulnerability (General Security Weakness) affecting Software libraries in the Maven ecosystem. Remediation is available in the latest vendor maintenance releases.

CVE-2026-64088 at a Glance

CVE Identifier CVE-2026-64088
GHSA Identifier GHSA-r69h-9cf6-78mg
Severity HIGH
CVSS v3.1 Base Score 8.8
CWE Classification General Security Weakness
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 8.8

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

How to Fix CVE-2026-64088

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-2026-64088, 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: batman-adv: tt: fix negative tt_buff_len batadv_orig_node::tt_buff_len was declared as s16, but the field is never intended to hold a negative value. When a value greater than 32767 is assigned, it wraps to a negative signed integer. In batadv_send_other_tt_response(), tt_buff_len is temporarily widened to s32. The incorrectly negative s16 value propagates into the s32, causing batadv_tt_prepare_tvlv_global_data() to allocate a full sized buffer but populates only a small portion of it with the collected changeset. All remaining bits are kept uninitialized. Using an u16 avoids this type confusion and ensures that no (negative) sign extension is performed in batadv_send_other_tt_response().

References

NVD — CVE-2026-64088 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-64088
git.kernel.org/stable/c/32edd2a28e... WEB
https://git.kernel.org/stable/c/32edd2a28e112064020a2f319a8cb8a9e5a09767
git.kernel.org/stable/c/33e5ede7ce... WEB
https://git.kernel.org/stable/c/33e5ede7ce6d92e531920d4bbd6d3e18ef1c6430
git.kernel.org/stable/c/3c96dff009... WEB
https://git.kernel.org/stable/c/3c96dff00998314983b68a3e7caac07a66ebe496
git.kernel.org/stable/c/4c4c2f340f... WEB
https://git.kernel.org/stable/c/4c4c2f340f4c27373bfcac8dc5032ce7bb474e47
git.kernel.org/stable/c/4dab989614... WEB
https://git.kernel.org/stable/c/4dab98961426d0cf6a1599cda6950b7596ca2fcd
git.kernel.org/stable/c/730de8733d... WEB
https://git.kernel.org/stable/c/730de8733dd90f70d7580a9b329b971f8e1474a2
git.kernel.org/stable/c/b64963a2ce... WEB
https://git.kernel.org/stable/c/b64963a2ceeb7529310b6cf253a1e540784422f4
git.kernel.org/stable/c/ed28ead342... WEB
https://git.kernel.org/stable/c/ed28ead3420c373a7928622f114bc6168075d1e1

Frequently Asked Questions

What is CVE-2026-64088?
CVE-2026-64088 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-2026-64088?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-64088?
CVE-2026-64088 has a CVSS v3.1 base score of 8.8 (HIGH) with vector string CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2026-64088?
CVE-2026-64088 is classified under General Security Weakness.
How can I check Maven dependencies for CVE-2026-64088?
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-r69h-9cf6-78mg",
  "modified" : "2026-07-20T15:31:59Z",
  "published" : "2026-07-19T18:31:51Z",
  "aliases" : [ "CVE-2026-64088" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: tt: fix negative tt_buff_len\n\nbatadv_orig_node::tt_buff_len was declared as s16, but the field is never\nintended to hold a negative value. When a value greater than 32767 is\nassigned, it wraps to a negative signed integer.\n\nIn batadv_send_other_tt_response(), tt_buff_len is temporarily widened to\ns32. The incorrectly negative s16 value propagates into the s32, causing\nbatadv_tt_prepare_tvlv_global_data() to allocate a full sized buffer but\npopulates only a small portion of it with the collected changeset. All\nremaining bits are kept uninitialized.\n\nUsing an u16 avoids this type confusion and ensures that no (negative) sign\nextension is performed in batadv_send_other_tt_response().",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-64088"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/32edd2a28e112064020a2f319a8cb8a9e5a09767"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/33e5ede7ce6d92e531920d4bbd6d3e18ef1c6430"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/3c96dff00998314983b68a3e7caac07a66ebe496"
  }, {
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    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/b64963a2ceeb7529310b6cf253a1e540784422f4"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/ed28ead3420c373a7928622f114bc6168075d1e1"
  } ],
  "database_specific" : {
    "cwe_ids" : [ ],
    "severity" : "HIGH",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-07-19T16:17:49Z"
  }
}