Internal data disclosure via cross-host redirects
Published Feb 25, 2026 · Updated Feb 25, 2026
SSRF in the HTTP module route of esm-dev esm.sh 136 allows remote attackers to read internal web responses through crafted module URLs. The route accepts HTTP module paths, and its unrestricted client follows a cross-host 302 redirect after validating only the initial URL suffix. No authentication or user interaction is required; exposure includes reachable internal sites and cloud metadata responses, including credentials.
Summary
What happened
SSRF in the HTTP module route of esm-dev esm.sh 136 allows remote attackers to read internal web responses through crafted module URLs. The route accepts HTTP module paths, and its unrestricted client follows a cross-host 302 redirect after validating only the initial URL suffix. No authentication or user interaction is required; exposure includes reachable internal sites and cloud metadata responses, including credentials.
The record
- CVE
- CVE-2025-50180
- Published
- Feb 25, 2026
- Updated
- Feb 25, 2026
- Vendor
- esm-dev
- Product
- esm.sh
- Classifications
- CWE-918, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 25, 2026CVE publishedPublication date reported by the CVE source.
- Feb 25, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion== 136
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- GitHub advisory redirect proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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