CVE-2025-50180

esm.sh is a no-build content delivery network (CDN) for web development. In version 136, esm.sh is vulnerable to a full-response SSRF, allowing an attacker to retrieve information from internal websites through the vulnerability. Version 137 fixes the vulnerability.

Score

CVSS 4.0 8.7 High

Status

Analyzed - security-advisories@github.com

Published

2026-02-25

Last modified

2026-02-27

Weaknesses

CWE-918

Affected products

• Esm.sh (Esm)
• Esm.sh (Esm-dev)

References

• https://github.com/esm-dev/esm.sh/blob/f80ff8c8d58749e77fa964abde468fc61f8bd89e/internal/fetch/fetch.go#L13
• https://github.com/esm-dev/esm.sh/blob/f80ff8c8d58749e77fa964abde468fc61f8bd89e/server/router.go#L511
• https://github.com/esm-dev/esm.sh/commit/0593516c4cfab49ad3b4900416a8432ff2e23eb0
• https://github.com/esm-dev/esm.sh/pull/1149
• https://github.com/esm-dev/esm.sh/releases/tag/v137
• https://github.com/esm-dev/esm.sh/security/advisories/GHSA-3c9r-837r-qqm4