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CVE-2026-44593

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
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:5fd17d6f461b9910c298402a98bc4d2969d76176c98353f490c4070286da4d4c
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"esm.sh","vendor":"esm-dev","versions":[{"status":"affected","version":"<= 137"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:f656bef808c9bbcb9e5973ac8a0373eb6e07b808af110375985eca73e73a90e6 · sha256:551ead31ef4ddb00… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":8.7,"baseSeverity":"HIGH","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"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","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"HIGH"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:f656bef808c9bbcb9e5973ac8a0373eb6e07b808af110375985eca73e73a90e6 · sha256:551ead31ef4ddb00… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-22","description":"CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:f656bef808c9bbcb9e5973ac8a0373eb6e07b808af110375985eca73e73a90e6 · sha256:551ead31ef4ddb00… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"name":"https://github.com/esm-dev/esm.sh/security/advisories/GHSA-3636-h3vx-6465","tags":["x_refsource_CONFIRM"],"url":"https://github.com/esm-dev/esm.sh/security/advisories/GHSA-3636-h3vx-6465"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:f656bef808c9bbcb9e5973ac8a0373eb6e07b808af110375985eca73e73a90e6 · sha256:551ead31ef4ddb00… · /containers/cna/references/0
{"tags":["exploit"],"url":"https://github.com/esm-dev/esm.sh/security/advisories/GHSA-3636-h3vx-6465"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:f656bef808c9bbcb9e5973ac8a0373eb6e07b808af110375985eca73e73a90e6 · sha256:551ead31ef4ddb00… · /containers/adp/0/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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