CVE-2026-8034: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-w548-vv26-rff6
Share
CVSS 9.8
CWE-436
Published
Advisory Summary

CVE-2026-8034 is a HIGH (CVSS 9.8) security vulnerability vulnerability (CWE-436: Interpretation Conflict) affecting Software libraries in the Maven ecosystem. The weakness occurs when product a handles inputs or steps differently than product b, which causes a to perform incorrect actions based on its perception of b's state.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-8034 at a Glance

CVE Identifier CVE-2026-8034
GHSA Identifier GHSA-w548-vv26-rff6
Severity HIGH
CVSS v3.1 Base Score 9.8
CWE Classification CWE-436: Interpretation Conflict
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 9.8

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

How to Fix CVE-2026-8034

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-2026-8034, 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-436: Interpretation Conflict, where product a handles inputs or steps differently than product b, which causes a to perform incorrect actions based on its perception of b's state. 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

A server-side request forgery (SSRF) vulnerability was identified in the GitHub Enterprise Server notebook viewer that allowed an attacker to access internal services by exploiting URL parser confusion between the validation layer and the HTTP request library. The hostname validation used a different URL parser than the request library, enabling a crafted URL to pass validation while directing the request to an unintended host. Exploitation required network access to the GitHub Enterprise Server instance. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.21 and was fixed in versions 3.16.18, 3.17.15, 3.18.9, 3.19.6, and 3.20.2. This vulnerability was reported via the GitHub Bug Bounty program.

References

NVD — CVE-2026-8034 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-8034
Software Source Repository REPOSITORY
https://docs.github.com/en/enterprise-server@3.16/admin/release-notes#3.16.18
Software Source Repository REPOSITORY
https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.15
Software Source Repository REPOSITORY
https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.9
Software Source Repository REPOSITORY
https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.6
Software Source Repository REPOSITORY
https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.2

Frequently Asked Questions

What is CVE-2026-8034?
CVE-2026-8034 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-436: Interpretation Conflict.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-8034?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-8034?
CVE-2026-8034 has a CVSS v3.1 base score of 9.8 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2026-8034?
CVE-2026-8034 is classified under CWE-436: Interpretation Conflict (Product A handles inputs or steps differently than Product B, which causes A to perform incorrect actions based on its perception of B's state.).
How can I check Maven dependencies for CVE-2026-8034?
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-w548-vv26-rff6",
  "modified" : "2026-05-11T18:31:37Z",
  "published" : "2026-05-08T00:31:34Z",
  "aliases" : [ "CVE-2026-8034" ],
  "details" : "A server-side request forgery (SSRF) vulnerability was identified in the GitHub Enterprise Server notebook viewer that allowed an attacker to access internal services by exploiting URL parser confusion between the validation layer and the HTTP request library. The hostname validation used a different URL parser than the request library, enabling a crafted URL to pass validation while directing the request to an unintended host. Exploitation required network access to the GitHub Enterprise Server instance. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.21 and was fixed in versions 3.16.18, 3.17.15, 3.18.9, 3.19.6, and 3.20.2. This vulnerability was reported via the GitHub Bug Bounty program.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-8034"
  }, {
    "type" : "WEB",
    "url" : "https://docs.github.com/en/enterprise-server@3.16/admin/release-notes#3.16.18"
  }, {
    "type" : "WEB",
    "url" : "https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.15"
  }, {
    "type" : "WEB",
    "url" : "https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.9"
  }, {
    "type" : "WEB",
    "url" : "https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.6"
  }, {
    "type" : "WEB",
    "url" : "https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.2"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-436" ],
    "severity" : "HIGH",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-05-07T22:16:37Z"
  }
}