Is CVE-2026-44593 actively exploited?

No active exploitation of CVE-2026-44593 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-44593 be exploited remotely?

Yes. CVE-2026-44593 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-44593?

CVE-2026-44593 has a CVSS score of 8.7 (HIGH).

HOME VULNERABILITIESCVE-2026-44593

HIGH

CVE-2026-44593

CWE-22Published: May 28, 2026· Updated: Jun 2, 2026

8.7

CVSS v3.1

EPSS:0.06%probability of exploitation in 30 daysPercentile:19.7th

Official Description

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.

NVD Source

Technical Analysis

CVE-2026-44593 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges Req.None

User InteractionNone

ScopeX

Impact

Confidentiality

Integrity

Availability

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X