CVE-2026-21753: HCL Hive Supply Chain Vulnerability

CVE-2026-21753 Overview

CVE-2026-21753 affects HCL Hive, which suffers from weak software supply chain governance. The weakness allows vulnerable, unmaintained, or malicious third-party dependencies to be introduced into the application environment. The issue is classified under [CWE-1104] Use of Unmaintained Third Party Components. Successful exploitation requires user interaction over the network and results in limited impact to confidentiality and integrity, with no direct availability impact.

Critical Impact
Introduction of vulnerable or malicious third-party components into HCL Hive can expose applications to downstream code execution, data exposure, or trust chain compromise depending on the dependency introduced.

Affected Products

HCL Hive (version details not published in the NVD record)
Applications and services built on HCL Hive that inherit its dependency graph
Environments consuming HCL Hive third-party components without governance controls

Discovery Timeline

2026-08-25 - CVE-2026-21753 published to the National Vulnerability Database
2026-08-25 - Last updated in NVD database

Technical Details for CVE-2026-21753

Vulnerability Analysis

The vulnerability is a software supply chain governance weakness in HCL Hive. HCL Hive does not sufficiently enforce controls over the sourcing, vetting, and lifecycle management of third-party dependencies. As a result, dependencies that are outdated, unmaintained, or intentionally malicious can be pulled into the runtime environment. This class of weakness maps to [CWE-1104], Use of Unmaintained Third Party Components.

Exploitation requires network access, user interaction, and high attack complexity. The impact is bounded to low confidentiality and low integrity effects at the direct vulnerability level. The larger risk is transitive: a compromised or vulnerable dependency can expand the impact well beyond what the CVSS base score reflects for the governance failure itself.

Root Cause

The root cause is insufficient governance over HCL Hive's software supply chain. There is no enforced validation that third-party components are current, maintained, and free of known vulnerabilities before they enter the application. This absence of controls covers dependency selection, integrity verification, provenance attestation, and continued monitoring across the component lifecycle.

Attack Vector

An attacker leverages the governance gap by influencing the dependency chain consumed by HCL Hive. Vectors include publishing malicious packages that HCL Hive resolves, exploiting known vulnerabilities in unmaintained transitive dependencies, or performing dependency confusion against internal component names. The high attack complexity and required user interaction reflect the conditional nature of these paths.

No verified proof-of-concept code has been published for CVE-2026-21753. Refer to the HCL Software Knowledge Base Article for vendor-provided technical details.

Detection Methods for CVE-2026-21753

Indicators of Compromise

Unexpected third-party packages or version changes appearing in HCL Hive dependency manifests or lockfiles.
Outbound network connections from HCL Hive processes to package registries or unfamiliar external hosts during runtime.
New binaries, scripts, or dynamic modules loaded by HCL Hive that lack a verifiable provenance record.

Detection Strategies

Generate and diff Software Bills of Materials (SBOMs) for HCL Hive builds and flag any unmaintained or vulnerable components identified against sources such as the NVD and OSV.
Enforce dependency integrity checks using cryptographic hashes and signatures at build time to detect substitution or tampering.
Run continuous Software Composition Analysis (SCA) against HCL Hive repositories and build pipelines.

Monitoring Recommendations

Monitor build systems and CI/CD pipelines for changes in resolved dependency versions and untrusted registry endpoints.
Alert on runtime loading of unsigned or unexpected libraries within HCL Hive processes.
Track advisories from the HCL Software Knowledge Base Article and upstream component maintainers for further guidance.

How to Mitigate CVE-2026-21753

Immediate Actions Required

Review the HCL Software Knowledge Base Article and apply vendor-recommended updates for HCL Hive.
Inventory all HCL Hive deployments and generate an SBOM for each build to identify vulnerable or unmaintained components.
Restrict dependency resolution to trusted internal registries with signature verification enabled.

Patch Information

HCL Software has published guidance in the HCL Software Knowledge Base Article KB0133342. Administrators should consult the article for fixed versions, recommended dependency updates, and configuration hardening steps specific to their HCL Hive deployment.

Workarounds

Pin HCL Hive dependencies to reviewed, maintained versions and enforce lockfile integrity in CI/CD.
Implement allowlists for approved package sources and block resolution from public registries where feasible.
Adopt policy-as-code controls that reject builds containing components flagged as unmaintained or vulnerable.

bash

# Configuration example
# Refer to the HCL Software Knowledge Base Article (KB0133342) for
# vendor-specific configuration steps. No verified configuration
# snippet is published for CVE-2026-21753 at this time.