CVE-2026-44594esm.sh: Path Traversal via package.json browser field allows reading arbitrary server files
Updated under an hour ago ()
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It affects esm-dev esm.sh. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- Weakness (CWE)
- CWE-22
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Deferred
- Record last updated
- May 28, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
esm-dev esm.sh esm_dev:esm.sh (from the name) | through 137 | CNA record |
References
- https://github.com/esm-dev/esm.sh/security/advisories/GHSA-rg65-45m7-hq57x-refsource-confirm
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.