CVE-2025-65026: esm.sh is a nobuild content delivery network(CDN) for modern web development

Q: How do I fix CVE-2025-65026?

esm.sh: upgrade to 136. Exact commands for each OS are on this page.

Q: Is CVE-2025-65026 being exploited?

CVE-2025-65026 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-65026 affect?

CVE-2025-65026 affects esm.sh. Severity is medium (CVSS 6.1). esm.sh is a nobuild content delivery network(CDN) for modern web development. Prior to version 136, The esm.sh CDN service contains a Template Literal Injection vulnerability (CWE-94) in its CSS-to-JavaScript module conversion feature. When

Q: How urgent is CVE-2025-65026?

Priority 37/100. Public exploit reference

Routine

MEDIUM 6.1UPGRADE

CVE-2025-65026 is a medium-severity flaw (CVSS 6.1) affecting esm.sh. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

esm.sh is a nobuild content delivery network(CDN) for modern web development. Prior to version 136, The esm.sh CDN service contains a Template Literal Injection vulnerability (CWE-94) in its CSS-to-JavaScript module conversion feature. When a CSS file is requested with the ?module query parameter, esm.sh converts it to a JavaScript module by embedding the CSS content directly into a template literal without proper sanitization. An attacker can in

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.5% (top 56%)
CISA exploited list	No
Weakness	CWE-94, CWE-79
Published	2025-11-19
Last modified	2026-10-18

Publisher (CNA): GitHub, Inc. · Vendor: esm

Last updated 2026-10-18 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-11-19 18:15 UTCPublished CVE record published
2026-10-18 20:10 UTCUpdated Record last modified

esm esm.sh UPGRADE

Affected: < 136

Fixed in: 136

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy esm.sh || rpm -q esm.sh || esm.sh --version

2. UPGRADE to 136 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade esm.sh

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade esm.sh

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-65026?

esm.sh: upgrade to 136. Exact commands for each OS are on this page.

Is CVE-2025-65026 being exploited?

CVE-2025-65026 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-65026 affect?

CVE-2025-65026 affects esm.sh. Severity is medium (CVSS 6.1). esm.sh is a nobuild content delivery network(CDN) for modern web development. Prior to version 136, The esm.sh CDN service contains a Template Literal Injection vulnerability (CWE-94) in its CSS-to-JavaScript module conversion feature. When

How urgent is CVE-2025-65026?

Priority 37/100. Public exploit reference

Related CVEs

CVE-2025-65025 HIGH 8.2 UPGRADE esm.sh is a nobuild content delivery network(CDN) for modern web development
CVE-2026-27730 HIGH 7.5 UPGRADE esm.sh is a no-build content delivery network (CDN) for web development
CVE-2026-23644 HIGH 7.5 UPGRADE esm.sh is a no-build content delivery network (CDN) for web development
CVE-2025-50180 HIGH 7.5 UPGRADE esm.sh is a no-build content delivery network (CDN) for web development

References

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