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01 Record

CVE-2026-27730

esm.sh has SSRF localhost/private-network bypass in `/http(s)` module route

HighPUBLISHEDCNA: GitHub_M
CNA base score8.6 CVSS v3.xCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

02 Description

esm.sh has SSRF localhost/private-network bypass in `/http(s)` module route

03 Exploitation and scoring

Exploitation
Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.
SSVC decision
  • ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
  • AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
  • Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
0.38% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 32.4% of scored records. A rank, not a probability.
NVD base score
7.5 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD analysis status
Analyzed. NVD last modified this record on 2026-06-17.
Red Hat severity
No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2026-02-25 15:37Z8 MO AGO
Last updated
2026-02-25 20:32Z8 MO AGO
Reserved
2026-02-23
Assigning CNA
GitHub_M
Record state
PUBLISHED
Severity
High (CVSS 8.6)
CNA CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
Weaknesses
  • CWE-918Server-Side Request Forgery (SSRF)Base
Data version
5.2
Document digest
a1e3043efb303b9cf0d18a0f0130ee575c6f24732b9330ddae192024e7c518da

05 Affected products

VendorProductVersionsPlatforms
esm-devesm.sh<= 137—

06 References