CVE-2026-89720: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-8388-259p-82vg
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CVSS 7.7
Published
Advisory Summary

CVE-2026-89720 is a HIGH (CVSS 7.7) security vulnerability vulnerability (General Security Weakness) affecting Software libraries in the Maven ecosystem. Remediation is available in the latest vendor maintenance releases.

CVE-2026-89720 at a Glance

CVE Identifier CVE-2026-89720
GHSA Identifier GHSA-8388-259p-82vg
Severity HIGH
CVSS v3.1 Base Score 7.7
CWE Classification General Security Weakness
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 7.7

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

Attack Vector Local (AV:L)
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-2026-89720

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-2026-89720, 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: ubifs: fix out-of-bounds read in signature length check ubifs_sb_verify_signature() bounds the on-disk ubifs_sig_node->len field before handing the signature payload to verify_pkcs7_signature(), but the check has the wrong sign: if (le32_to_cpu(signode->len) > snod->len + sizeof(struct ubifs_sig_node)) The signature bytes start sizeof(struct ubifs_sig_node) (UBIFS_SIG_NODE_SZ, 64 bytes) into the node, so the payload is at most snod->len - sizeof(struct ubifs_sig_node) bytes long. Adding the header size instead of subtracting it accepts a declared length up to 2 * UBIFS_SIG_NODE_SZ larger than the node actually holds -- past the end of c->sbuf, which is vmalloc(c->leb_size). verify_pkcs7_signature() -> pkcs7_parse_message() -> asn1_ber_decoder() is then handed that inflated length and reads beyond the allocation while walking the DER headers. The node length comes straight from the mounted image, so a crafted signed UBIFS image reaches this via ubifs_read_superblock() before the signature is cryptographically checked. snod->len is guaranteed to be >= UBIFS_SIG_NODE_SZ by the node scanner (c->ranges[UBIFS_SIG_NODE].min_len == UBIFS_SIG_NODE_SZ), so the corrected subtraction cannot underflow. Legitimately signed images are unaffected: a correct superblock never declares a signature longer than the node it is embedded in.

References

NVD — CVE-2026-89720 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-89720
git.kernel.org/stable/c/11abc34698... WEB
https://git.kernel.org/stable/c/11abc34698cb3172badf8aa12e623f1bac98bbd8
git.kernel.org/stable/c/37a9d25a56... WEB
https://git.kernel.org/stable/c/37a9d25a563f5f9103282954ce573c4a61321e7c
git.kernel.org/stable/c/83e1aa9f5f... WEB
https://git.kernel.org/stable/c/83e1aa9f5f906c9b1f4949d0521f0f950a159d96
git.kernel.org/stable/c/8cc3da72cf... WEB
https://git.kernel.org/stable/c/8cc3da72cf57acb4b77442ea8cec48425dff7c06
git.kernel.org/stable/c/95d27c1708... WEB
https://git.kernel.org/stable/c/95d27c1708bb6e8823c8e7c623f9abc2a91bf4bf
git.kernel.org/stable/c/a1dc246f98... WEB
https://git.kernel.org/stable/c/a1dc246f98bb94233effa4fa3ec7bf84700bb7d1
git.kernel.org/stable/c/ab7405bd86... WEB
https://git.kernel.org/stable/c/ab7405bd86331cc2dbc8201699d4adc33bea75e7
git.kernel.org/stable/c/f76b79d6e4... WEB
https://git.kernel.org/stable/c/f76b79d6e42af20682495bccd22f72c7164b0018

Frequently Asked Questions

What is CVE-2026-89720?
CVE-2026-89720 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-2026-89720?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-89720?
CVE-2026-89720 has a CVSS v3.1 base score of 7.7 (HIGH) with vector string CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H.
What CWE is associated with CVE-2026-89720?
CVE-2026-89720 is classified under General Security Weakness.
How can I check Maven dependencies for CVE-2026-89720?
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-8388-259p-82vg",
  "modified" : "2026-09-14T15:32:35Z",
  "published" : "2026-09-11T21:31:37Z",
  "aliases" : [ "CVE-2026-89720" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nubifs: fix out-of-bounds read in signature length check\n\nubifs_sb_verify_signature() bounds the on-disk ubifs_sig_node->len field\nbefore handing the signature payload to verify_pkcs7_signature(), but the\ncheck has the wrong sign:\n\n\tif (le32_to_cpu(signode->len) > snod->len + sizeof(struct ubifs_sig_node))\n\nThe signature bytes start sizeof(struct ubifs_sig_node) (UBIFS_SIG_NODE_SZ,\n64 bytes) into the node, so the payload is at most\n\n\tsnod->len - sizeof(struct ubifs_sig_node)\n\nbytes long. Adding the header size instead of subtracting it accepts a\ndeclared length up to 2 * UBIFS_SIG_NODE_SZ larger than the node actually\nholds -- past the end of c->sbuf, which is vmalloc(c->leb_size).\nverify_pkcs7_signature() -> pkcs7_parse_message() -> asn1_ber_decoder()\nis then handed that inflated length and reads beyond the allocation while\nwalking the DER headers. The node length comes straight from the mounted\nimage, so a crafted signed UBIFS image reaches this via\nubifs_read_superblock() before the signature is cryptographically checked.\n\nsnod->len is guaranteed to be >= UBIFS_SIG_NODE_SZ by the node scanner\n(c->ranges[UBIFS_SIG_NODE].min_len == UBIFS_SIG_NODE_SZ), so the corrected\nsubtraction cannot underflow. Legitimately signed images are unaffected: a\ncorrect superblock never declares a signature longer than the node it is\nembedded in.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H"
  } ],
  "affected" : [ ],
  "references" : [ {
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    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/37a9d25a563f5f9103282954ce573c4a61321e7c"
  }, {
    "type" : "WEB",
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  }, {
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    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/ab7405bd86331cc2dbc8201699d4adc33bea75e7"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/f76b79d6e42af20682495bccd22f72c7164b0018"
  } ],
  "database_specific" : {
    "cwe_ids" : [ ],
    "severity" : "HIGH",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-09-11T20:20:00Z"
  }
}