# CWE-459: Incomplete Cleanup > As of 2026-10-05, CWE-459 (Incomplete Cleanup) underlies 6 CVEs tracked by Threadlinqs, none of them in the CISA Known Exploited Vulnerabilities catalog, and is cited by 4 tracked threats. **Last updated:** 2026-10-05 ## What is CWE-459? The product does not properly "clean up" and remove temporary or supporting resources after they have been used. CWE-459 is a base-level weakness in MITRE’s Common Weakness Enumeration. Applicable platforms: Not Language-Specific. _Source: [MITRE CWE](https://cwe.mitre.org/data/definitions/459.html) (CWE-459 definition, reproduced verbatim). Counts and linkage below are Threadlinqs data._ ## Consequences - **Other, Confidentiality, Integrity** — Other, Read Application Data, Modify Application Data, DoS: Resource Consumption (Other). It is possible to overflow the number of temporary files because directories typically have limits on the number of files allowed. This could create a denial of service problem. _Source: MITRE CWE, common consequences._ ## How CWE-459 is exploited in the wild Threadlinqs maps 6 CVEs to CWE-459, published between 2026-05-12 and 2026-09-14. None of them is in the CISA KEV catalog yet. By CVSS v3 severity the set splits into 1 critical, 1 high, 4 low. The highest EPSS score in the set is 0.4% (CVE-2026-42492), the modelled probability of exploitation in the next 30 days. 4 tracked threats reference CWE-459 directly or through a CVE it covers; the most recent is “SafePal Data Breach: Order-Tracking Plug-in Authorization Flaw Exposes 39,798 Crypto Wallet Customers' PII, Fuels Phishing Campaign” (2026-08-16). Affected products concentrate in Arista Networks (3), Mattermost (1), SAP_SE (1), among 4 vendors in total. ## Vulnerabilities (CVEs) All 6 CVEs mapped to CWE-459, CISA KEV first, then by CVSS score. - [CVE-2026-34263](https://intel.threadlinqs.com/cve/CVE-2026-34263) — CVSS 9.6 critical · EPSS 0.0% · published 2026-05-12 - [CVE-2026-42492](https://intel.threadlinqs.com/cve/CVE-2026-42492) — CVSS 7.5 high · EPSS 0.4% · published 2026-07-28 - [CVE-2026-9693](https://intel.threadlinqs.com/cve/CVE-2026-9693) — CVSS 3.5 low · published 2026-08-17 - [CVE-2026-75944](https://intel.threadlinqs.com/cve/CVE-2026-75944) — CVSS 2.6 low · EPSS 0.1% · published 2026-09-14 - [CVE-2026-75943](https://intel.threadlinqs.com/cve/CVE-2026-75943) — CVSS 2.6 low · EPSS 0.1% · published 2026-09-14 - [CVE-2026-75945](https://intel.threadlinqs.com/cve/CVE-2026-75945) — CVSS 2.6 low · EPSS 0.1% · published 2026-09-14 ## Affected vendors - [Arista Networks](https://intel.threadlinqs.com/vendors/arista-networks) — 3 CVEs - [Mattermost](https://intel.threadlinqs.com/vendors/mattermost) — 1 CVE - [SAP_SE](https://intel.threadlinqs.com/vendors/sap-se) — 1 CVE - **Xen** — 1 CVE ## Threat activity 4 tracked threats cite CWE-459: - [SafePal Data Breach: Order-Tracking Plug-in Authorization Flaw Exposes 39,798 Crypto Wallet Customers' PII, Fuels Phishing Campaign](https://intel.threadlinqs.com/threat/TL-2026-2032) — MEDIUM · 2026-08-16 - [SAP Patches Critical Code Injection, Memory Corruption Vulnerabilities (CVE-2026-58231, CVSS 10.0)](https://intel.threadlinqs.com/threat/TL-2026-1984) — CRITICAL · 2026-08-11 - [Multiple Vulnerabilities in Citrix XenServer 8.4 and 9 Enable Guest-to-Host Escalation and Denial of Service (CVE-2026-42492, CVE-2026-62428, CVE-2026-62431, CVE-2026-62432, CVE-2026-62434, CVE-2026-62435, CVE-2026-62436)](https://intel.threadlinqs.com/threat/TL-2026-1781) — HIGH · 2026-07-31 - [SAP May 2026 HotNews — CVE-2026-34263 Commerce Cloud Unauthenticated RCE & CVE-2026-34260 S/4HANA Enterprise Search SQL Injection (CVSS 9.6)](https://intel.threadlinqs.com/threat/TL-2026-0501) — CRITICAL · 2026-05-12 ## Mitigations - **Architecture and Design, Implementation**: Temporary files and other supporting resources should be deleted/released immediately after they are no longer needed. _Source: MITRE CWE, potential mitigations._ ## Detection methods (MITRE CWE) - **Automated Static Analysis**: Automated static analysis, commonly referred to as Static Application Security Testing (SAST), can find some instances of this weakness by analyzing source code (or binary/compiled code) without having to execute it. Typically, this is done by building a model of data flow and control flow, then searching for potentially-vulnerable patterns that connect "sources" (origins of input) with "sinks" (destinations where the data interacts with external components, a lower layer such as the OS, etc.) _Source: MITRE CWE, detection methods. Threadlinqs detection rules for the threats above are Blue tier and higher._ ## Related weaknesses - [CWE-404](https://cwe.mitre.org/data/definitions/404.html) Canonical: https://intel.threadlinqs.com/cwe/CWE-459 Source definition: https://cwe.mitre.org/data/definitions/459.html Detection rules and IOCs for threats exploiting CWE-459 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp