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Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2026-27730

esm.sh is a no-build content delivery network (CDN) for web development. Versions up to and including 137 have an SSRF vulnerability (CWE-918) in esm.sh’s `/http(s)` fetch route. The service tries to block localhost/internal targets, but the validation is based on hostname string checks and can be bypassed using DNS alias domains. This allows an external requester to make the esm.sh server fetch internal localhost services. As of time of publication, no known patched versions exist.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 12.4%
CVSS Severity
CVSS v3 Score 8.6
Products affected by CVE-2026-27730
  • Esm » Esm.sh » Version: 100
    cpe:2.3:a:esm:esm.sh:100
  • Esm » Esm.sh » Version: 101
    cpe:2.3:a:esm:esm.sh:101
  • Esm » Esm.sh » Version: 102
    cpe:2.3:a:esm:esm.sh:102
  • Esm » Esm.sh » Version: 103
    cpe:2.3:a:esm:esm.sh:103
  • Esm » Esm.sh » Version: 104
    cpe:2.3:a:esm:esm.sh:104
  • Esm » Esm.sh » Version: 105
    cpe:2.3:a:esm:esm.sh:105
  • Esm » Esm.sh » Version: 106
    cpe:2.3:a:esm:esm.sh:106
  • Esm » Esm.sh » Version: 107
    cpe:2.3:a:esm:esm.sh:107
  • Esm » Esm.sh » Version: 108
    cpe:2.3:a:esm:esm.sh:108
  • Esm » Esm.sh » Version: 109
    cpe:2.3:a:esm:esm.sh:109
  • Esm » Esm.sh » Version: 110
    cpe:2.3:a:esm:esm.sh:110
  • Esm » Esm.sh » Version: 111
    cpe:2.3:a:esm:esm.sh:111
  • Esm » Esm.sh » Version: 112
    cpe:2.3:a:esm:esm.sh:112
  • Esm » Esm.sh » Version: 113
    cpe:2.3:a:esm:esm.sh:113
  • Esm » Esm.sh » Version: 114
    cpe:2.3:a:esm:esm.sh:114
  • Esm » Esm.sh » Version: 115
    cpe:2.3:a:esm:esm.sh:115
  • Esm » Esm.sh » Version: 116
    cpe:2.3:a:esm:esm.sh:116
  • Esm » Esm.sh » Version: 117
    cpe:2.3:a:esm:esm.sh:117
  • Esm » Esm.sh » Version: 118
    cpe:2.3:a:esm:esm.sh:118
  • Esm » Esm.sh » Version: 119
    cpe:2.3:a:esm:esm.sh:119
  • Esm » Esm.sh » Version: 120
    cpe:2.3:a:esm:esm.sh:120
  • Esm » Esm.sh » Version: 121
    cpe:2.3:a:esm:esm.sh:121
  • Esm » Esm.sh » Version: 122
    cpe:2.3:a:esm:esm.sh:122
  • Esm » Esm.sh » Version: 123
    cpe:2.3:a:esm:esm.sh:123
  • Esm » Esm.sh » Version: 124
    cpe:2.3:a:esm:esm.sh:124
  • Esm » Esm.sh » Version: 125
    cpe:2.3:a:esm:esm.sh:125
  • Esm » Esm.sh » Version: 126
    cpe:2.3:a:esm:esm.sh:126
  • Esm » Esm.sh » Version: 127
    cpe:2.3:a:esm:esm.sh:127
  • Esm » Esm.sh » Version: 128
    cpe:2.3:a:esm:esm.sh:128
  • Esm » Esm.sh » Version: 129
    cpe:2.3:a:esm:esm.sh:129
  • Esm » Esm.sh » Version: 130
    cpe:2.3:a:esm:esm.sh:130
  • Esm » Esm.sh » Version: 131
    cpe:2.3:a:esm:esm.sh:131
  • Esm » Esm.sh » Version: 132
    cpe:2.3:a:esm:esm.sh:132
  • Esm » Esm.sh » Version: 133
    cpe:2.3:a:esm:esm.sh:133
  • Esm » Esm.sh » Version: 134
    cpe:2.3:a:esm:esm.sh:134
  • Esm » Esm.sh » Version: 135
    cpe:2.3:a:esm:esm.sh:135
  • Esm » Esm.sh » Version: 135_1
    cpe:2.3:a:esm:esm.sh:135_1
  • Esm » Esm.sh » Version: 135_2
    cpe:2.3:a:esm:esm.sh:135_2
  • Esm » Esm.sh » Version: 135_3
    cpe:2.3:a:esm:esm.sh:135_3
  • Esm » Esm.sh » Version: 135_4
    cpe:2.3:a:esm:esm.sh:135_4
  • Esm » Esm.sh » Version: 135_5
    cpe:2.3:a:esm:esm.sh:135_5
  • Esm » Esm.sh » Version: 135_6
    cpe:2.3:a:esm:esm.sh:135_6
  • Esm » Esm.sh » Version: 135_7
    cpe:2.3:a:esm:esm.sh:135_7
  • Esm » Esm.sh » Version: 136
    cpe:2.3:a:esm:esm.sh:136
  • Esm » Esm.sh » Version: 136_1
    cpe:2.3:a:esm:esm.sh:136_1
  • Esm » Esm.sh » Version: 34
    cpe:2.3:a:esm:esm.sh:34
  • Esm » Esm.sh » Version: 35
    cpe:2.3:a:esm:esm.sh:35
  • Esm » Esm.sh » Version: 37
    cpe:2.3:a:esm:esm.sh:37
  • Esm » Esm.sh » Version: 38
    cpe:2.3:a:esm:esm.sh:38
  • Esm » Esm.sh » Version: 39
    cpe:2.3:a:esm:esm.sh:39
  • Esm » Esm.sh » Version: 40
    cpe:2.3:a:esm:esm.sh:40
  • Esm » Esm.sh » Version: 41
    cpe:2.3:a:esm:esm.sh:41
  • Esm » Esm.sh » Version: 43
    cpe:2.3:a:esm:esm.sh:43
  • Esm » Esm.sh » Version: 44
    cpe:2.3:a:esm:esm.sh:44
  • Esm » Esm.sh » Version: 45
    cpe:2.3:a:esm:esm.sh:45
  • Esm » Esm.sh » Version: 46
    cpe:2.3:a:esm:esm.sh:46
  • Esm » Esm.sh » Version: 47
    cpe:2.3:a:esm:esm.sh:47
  • Esm » Esm.sh » Version: 48
    cpe:2.3:a:esm:esm.sh:48
  • Esm » Esm.sh » Version: 49
    cpe:2.3:a:esm:esm.sh:49
  • Esm » Esm.sh » Version: 50
    cpe:2.3:a:esm:esm.sh:50
  • Esm » Esm.sh » Version: 51
    cpe:2.3:a:esm:esm.sh:51
  • Esm » Esm.sh » Version: 52
    cpe:2.3:a:esm:esm.sh:52
  • Esm » Esm.sh » Version: 53
    cpe:2.3:a:esm:esm.sh:53
  • Esm » Esm.sh » Version: 55
    cpe:2.3:a:esm:esm.sh:55
  • Esm » Esm.sh » Version: 56
    cpe:2.3:a:esm:esm.sh:56
  • Esm » Esm.sh » Version: 57
    cpe:2.3:a:esm:esm.sh:57
  • Esm » Esm.sh » Version: 59
    cpe:2.3:a:esm:esm.sh:59
  • Esm » Esm.sh » Version: 60
    cpe:2.3:a:esm:esm.sh:60
  • Esm » Esm.sh » Version: 61
    cpe:2.3:a:esm:esm.sh:61
  • Esm » Esm.sh » Version: 62
    cpe:2.3:a:esm:esm.sh:62
  • Esm » Esm.sh » Version: 63
    cpe:2.3:a:esm:esm.sh:63
  • Esm » Esm.sh » Version: 64
    cpe:2.3:a:esm:esm.sh:64
  • Esm » Esm.sh » Version: 65
    cpe:2.3:a:esm:esm.sh:65
  • Esm » Esm.sh » Version: 66
    cpe:2.3:a:esm:esm.sh:66
  • Esm » Esm.sh » Version: 67
    cpe:2.3:a:esm:esm.sh:67
  • Esm » Esm.sh » Version: 68
    cpe:2.3:a:esm:esm.sh:68
  • Esm » Esm.sh » Version: 69
    cpe:2.3:a:esm:esm.sh:69
  • Esm » Esm.sh » Version: 70
    cpe:2.3:a:esm:esm.sh:70
  • Esm » Esm.sh » Version: 71
    cpe:2.3:a:esm:esm.sh:71
  • Esm » Esm.sh » Version: 72
    cpe:2.3:a:esm:esm.sh:72
  • Esm » Esm.sh » Version: 73
    cpe:2.3:a:esm:esm.sh:73
  • Esm » Esm.sh » Version: 74
    cpe:2.3:a:esm:esm.sh:74
  • Esm » Esm.sh » Version: 75
    cpe:2.3:a:esm:esm.sh:75
  • Esm » Esm.sh » Version: 76
    cpe:2.3:a:esm:esm.sh:76
  • Esm » Esm.sh » Version: 77
    cpe:2.3:a:esm:esm.sh:77
  • Esm » Esm.sh » Version: 78
    cpe:2.3:a:esm:esm.sh:78
  • Esm » Esm.sh » Version: 79
    cpe:2.3:a:esm:esm.sh:79
  • Esm » Esm.sh » Version: 80
    cpe:2.3:a:esm:esm.sh:80
  • Esm » Esm.sh » Version: 81
    cpe:2.3:a:esm:esm.sh:81
  • Esm » Esm.sh » Version: 82
    cpe:2.3:a:esm:esm.sh:82
  • Esm » Esm.sh » Version: 83
    cpe:2.3:a:esm:esm.sh:83
  • Esm » Esm.sh » Version: 84
    cpe:2.3:a:esm:esm.sh:84
  • Esm » Esm.sh » Version: 85
    cpe:2.3:a:esm:esm.sh:85
  • Esm » Esm.sh » Version: 86
    cpe:2.3:a:esm:esm.sh:86
  • Esm » Esm.sh » Version: 87
    cpe:2.3:a:esm:esm.sh:87
  • Esm » Esm.sh » Version: 88
    cpe:2.3:a:esm:esm.sh:88
  • Esm » Esm.sh » Version: 89
    cpe:2.3:a:esm:esm.sh:89
  • Esm » Esm.sh » Version: 90
    cpe:2.3:a:esm:esm.sh:90
  • Esm » Esm.sh » Version: 91
    cpe:2.3:a:esm:esm.sh:91
  • Esm » Esm.sh » Version: 92
    cpe:2.3:a:esm:esm.sh:92
  • Esm » Esm.sh » Version: 93
    cpe:2.3:a:esm:esm.sh:93
  • Esm » Esm.sh » Version: 94
    cpe:2.3:a:esm:esm.sh:94
  • Esm » Esm.sh » Version: 95
    cpe:2.3:a:esm:esm.sh:95
  • Esm » Esm.sh » Version: 96
    cpe:2.3:a:esm:esm.sh:96
  • Esm » Esm.sh » Version: 97
    cpe:2.3:a:esm:esm.sh:97
  • Esm » Esm.sh » Version: 98
    cpe:2.3:a:esm:esm.sh:98
  • Esm » Esm.sh » Version: 99
    cpe:2.3:a:esm:esm.sh:99


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