CVE-2026-14534: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-v8cr-9jrc-fwf9
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CVSS 8.8
CWE-184
Published
Advisory Summary

CVE-2026-14534 is a HIGH (CVSS 8.8) security vulnerability vulnerability (CWE-184: Incomplete List of Disallowed Inputs) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product implements a protection mechanism that relies on a list of inputs (or properties of inputs) that are not allowed by policy or otherwise require other action to neutralize before additional processing takes place, but the list is incomplete.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-14534 at a Glance

CVE Identifier CVE-2026-14534
GHSA Identifier GHSA-v8cr-9jrc-fwf9
Severity HIGH
CVSS v3.1 Base Score 8.8
CWE Classification CWE-184: Incomplete List of Disallowed Inputs
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:N/AC:L/PR:N/UI:R/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 Required (UI:R)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2026-14534

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-2026-14534, 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-184: Incomplete List of Disallowed Inputs, where the product implements a protection mechanism that relies on a list of inputs (or properties of inputs) that are not allowed by policy or otherwise require other action to neutralize before additional processing takes place, but the list is incomplete. 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

Trail of Bits fickling versions up to and including 0.1.10 do not include the Python standard library modules _posixsubprocess, site, and atexit in the UNSAFE_IMPORTS denylist (fickle.py). Because these modules are absent from the denylist, fickling's check_safety() function returns LIKELY_SAFE with zero findings for pickle payloads that invoke dangerous functions including _posixsubprocess.fork_exec (C-level process spawner capable of executing arbitrary binaries), site.execsitecustomize (executes arbitrary site customization code), and atexit._run_exitfuncs (triggers all registered exit handler callbacks). The fickling.load() API chains check_safety() into pickle.loads() as an explicit security gate; a LIKELY_SAFE verdict causes the payload to be deserialized and executed. This shares the same root cause as CVE-2026-22607 (cProfile), CVE-2025-67748 (pty), and CVE-2025-67747 (marshal/types). OvertlyBadEvals does not flag these modules because they are standard library imports. UnsafeImports does not flag them because they are not in the denylist. The UnusedVariables heuristic is defeated by the SETITEMS opcode pattern.

References

GitHub Advisory / Wiki ADVISORY
https://github.com/trailofbits/fickling/security/advisories/GHSA-m6fh-58r7-x697
NVD — CVE-2026-14534 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-14534
Software Source Repository REPOSITORY
https://github.com/trailofbits/fickling/pull/272
Security Fix Commit FIX COMMIT
https://github.com/trailofbits/fickling/commit/e8408615b63adf034f891f653692ab9b51f0f5af
Software Release RELEASE
https://github.com/trailofbits/fickling/releases/tag/v0.1.11

Frequently Asked Questions

What is CVE-2026-14534?
CVE-2026-14534 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-184: Incomplete List of Disallowed Inputs.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-14534?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-14534?
CVE-2026-14534 has a CVSS v3.1 base score of 8.8 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2026-14534?
CVE-2026-14534 is classified under CWE-184: Incomplete List of Disallowed Inputs (The product implements a protection mechanism that relies on a list of inputs (or properties of inputs) that are not allowed by policy or otherwise require other action to neutralize before additional processing takes place, but the list is incomplete.).
How can I check Maven dependencies for CVE-2026-14534?
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-v8cr-9jrc-fwf9",
  "modified" : "2026-07-04T15:30:23Z",
  "published" : "2026-07-04T15:30:23Z",
  "aliases" : [ "CVE-2026-14534" ],
  "details" : "Trail of Bits fickling versions up to and including 0.1.10 do not include the Python standard library modules _posixsubprocess, site, and atexit in the UNSAFE_IMPORTS denylist (fickle.py). Because these modules are absent from the denylist, fickling's check_safety() function returns LIKELY_SAFE with zero findings for pickle payloads that invoke dangerous functions including _posixsubprocess.fork_exec (C-level process spawner capable of executing arbitrary binaries), site.execsitecustomize (executes arbitrary site customization code), and atexit._run_exitfuncs (triggers all registered exit handler callbacks). The fickling.load() API chains check_safety() into pickle.loads() as an explicit security gate; a LIKELY_SAFE verdict causes the payload to be deserialized and executed. This shares the same root cause as CVE-2026-22607 (cProfile), CVE-2025-67748 (pty), and CVE-2025-67747 (marshal/types). OvertlyBadEvals does not flag these modules because they are standard library imports. UnsafeImports does not flag them because they are not in the denylist. The UnusedVariables heuristic is defeated by the SETITEMS opcode pattern.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/trailofbits/fickling/security/advisories/GHSA-m6fh-58r7-x697"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-14534"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/trailofbits/fickling/pull/272"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/trailofbits/fickling/commit/e8408615b63adf034f891f653692ab9b51f0f5af"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/trailofbits/fickling/releases/tag/v0.1.11"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-184" ],
    "severity" : "HIGH",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-07-04T14:16:28Z"
  }
}