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CVE-2026-44594

esm.sh: Path Traversal via package.json browser field allows reading arbitrary server files

HIGH
7.5
CVSS Score
Published: May 28, 2026 at 02:45 PM UTC
Updated: June 17, 2026 at 10:51 AM UTC
1 product affected across 1 vendorEsm.sh

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Severity
HIGH7.5
Exploit prediction
EPSS 0.3%
SSVC
PoC

Description

esm.sh is a no-build content delivery network (CDN) for web development. In 137 and earlier, a Local File Inclusion (LFI) vulnerability exists in the esbuild plugin's handling of the browser field in package.json. An attacker can publish an npm package that causes the server to read and return arbitrary files from the host filesystem during the build process.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

x_refsource_CONFIRM
Source: cverecord
https://github.com/esm-dev/esm.sh/security/advisories/GHSA-rg65-45m7-hq57

SSVC — Action Prioritization

SSVCPoCAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHGitHub_M
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-22

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