CVE-2026-44593

Description

esm.sh: Legacy Route Path Traversal Can Lead to RCE

Description (MITRE) cveawg.mitre.org

Pulled from cveawg.mitre.org/api/cve/CVE-2026-44593 on 2026-07-08. Shown when MITRE's text differs from the cvelistV5 mirror.

esm.sh is a no-build content delivery network (CDN) for web development. In 137 and earlier, the legacy router first retrieves a response from legacyServer, parses the incoming request path, and ultimately writes the data to storage via buildStorage.Put. The router concatenates the path components without sanitizing them, producing a storage key. When this key is used, the underlying file system resolves the relative segments and writes the file to the specified path. Thus an attacker can craft a request that writes data to arbitrary locations on the server.

Overview

State

—

Assigner (CNA)

—

CVSS severity

critical

CVSS score

9.8 / 10

CVSS vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Effective score

9.8 / 10 CRITICAL source: CNA overview

CWE(s)

—

Reserved

—

Published

—

Last updated

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Source

https://www.tenable.com/cve/CVE-2026-44593

Linked Threat

CVE-2026-44593 — CVE-2026-44593

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID

EUVD-2026-32910

EUVD enrichment is queued; refresh the page in a few seconds.

Vendor references (0)

References embedded in the original CVE record by the assigning CNA.

None in the CVE record.

Web references (4)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

• https://github.com/esm-dev/esm.sh/security/advisories/GHSA-3636-h3vx-6465 tenable:github.com
• https://www.first.org/epss/ tenable:www.first.org
• https://nvd.nist.gov/vuln/detail/CVE-2026-44593 tenable:nvd.nist.gov
• https://www.cve.org/CVERecord?id=CVE-2026-44593 tenable:www.cve.org

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

• Virtual Patching - OWASP Cheat Sheet Series
  web:cheatsheetseries.owasp.org

  Virtual Patching Cheat Sheet Introduction The goal with this cheat Sheet is to present a concise virtual patching framework that organizations can follow to maximize the timely implementation of mitigation protections. Definition: Virtual Patching A security policy enforcement layer which prevents and reports the exploitation attempt of a known vulnerability. The virtual patch works when the ...

  2026-05-26 02:52 UTC
• CISA Warns of Exploited Microsoft Defender 0-Day Flaws
  web:cyberpress.org

  The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has added two actively exploited Microsoft Defender vulnerabilities to its Known Exploited Vulnerabilities (KEV) catalog, issuing an urgent remediation directive for federal agencies with a due date of June 3, 2026 .

  2026-05-26 02:52 UTC
• Security Update Guide - Microsoft
  web:portal.msrc.microsoft.com

  The Security Update Guide provides information on the latest Microsoft security updates, helping users understand and address potential vulnerabilities effectively.

  2026-05-26 02:52 UTC
• Vulnerability Remediation vs Mitigation: Which Strategy Wins in ...
  web:securityboulevard.com

  Organizations must decide how to tackle vulnerabilities—through remediation , mitigation , or a combination of both. But which strategy is more effective? This blog explores the nuances of vulnerability remediation vs mitigation , their respective benefits, and how to choose the right approach.

  2026-05-26 02:52 UTC
• Vulnerability Mitigation vs. Remediation: What Is the Difference?
  web:virsec.com

  In one of them, mitigation is a form of remediation . In another, it's a contrasting concept. However, the distinction between vulnerability mitigation and remediation is not just semantic; it's operational. Remediation offers a definitive, long-term vulnerability fix , but its time and resource demands make it insufficient on its own.

  2026-05-26 02:52 UTC
• Microsoft March 2025 Patch Tuesday fixes 7 zero-days, 57 flaws
  web:www.bleepingcomputer.com

  Today is Microsoft's March 2025 Patch Tuesday, which includes security updates for 57 flaws, including six actively exploited zero-day vulnerabilities.

  2026-05-26 02:52 UTC
• A guide to vulnerability remediation vs mitigation | @Bugcrowd
  web:www.bugcrowd.com

  Vulnerability mitigation is typically considered a temporary or interim solution. While mitigation measures can reduce the immediate risk associated with vulnerabilities, they may not provide a permanent fix . Organizations should aim to prioritize and plan for complete vulnerability remediation whenever feasible and allocate resources accordingly.

  2026-05-26 02:52 UTC
• Microsoft is working on a patch for 'YellowKey ... - Computerworld
  web:www.computerworld.com

  Microsoft says it is considering a patch for a zero-day vulnerability, dubbed YellowKey, that allows attackers with access to a Windows device to bypass Bitlocker encryption protection and read ...

  2026-05-26 02:52 UTC
• Is Vulnerability Mitigation Just Patching? Or Patching and Beyond ...
  web:www.secpod.com

  Mitigation , on the other hand, is the process of eradicating risk. It includes patching and other means of risk remediation . Examples could be workarounds, security controls, isolation, or even physical replacement of assets. So, have you been patching or mitigating? Why is Patching Not Enough?

  2026-05-26 02:52 UTC
• Vulnerability Remediation vs. Mitigation: What are the Differences ...
  web:www.secure.com

  Learn the difference between vulnerability remediation and mitigation , and how a risk-based strategy can strengthen your security posture.

  2026-05-26 02:52 UTC

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