{"id":77987,"date":"2026-02-25T19:53:27","date_gmt":"2026-02-25T16:23:27","guid":{"rendered":"https:\/\/afaghhosting.net\/blog\/cve-2026-27730-esm-sh-has-ssrf-localhost-private-network-bypass-in-https-module-route\/"},"modified":"2026-02-25T19:53:27","modified_gmt":"2026-02-25T16:23:27","slug":"cve-2026-27730-esm-sh-has-ssrf-localhost-private-network-bypass-in-https-module-route","status":"publish","type":"post","link":"https:\/\/afaghhosting.net\/blog\/cve-2026-27730-esm-sh-has-ssrf-localhost-private-network-bypass-in-https-module-route\/","title":{"rendered":"CVE-2026-27730 &#8211; esm.sh has SSRF localhost\/private-network bypass in `\/http(s)` module route"},"content":{"rendered":"<p>CVE ID : CVE-2026-27730<\/p>\n<p>Published :  Feb. 25, 2026, 4:23 p.m. | 45\u00a0minutes ago<\/p>\n<p>Description : 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\u2019s `\/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.<\/p>\n<p>Severity: 8.6 | HIGH<\/p>\n<p>Visit the link for more details, such as CVSS details, affected products, timeline, and more&#8230;\u00a0<\/p>\n","protected":false},"excerpt":{"rendered":"<p>CVE ID : CVE-2026-27730 Published : Feb. 25, 2026, 4:23 p.m. | 45\u00a0minutes ago Description : 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\u2019s `\/http(s)` fetch route. The service tries to block localhost\/internal targets, but the validation is based &hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26],"tags":[],"class_list":["post-77987","post","type-post","status-publish","format-standard","hentry","category-vulnerability"],"_links":{"self":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/77987","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/comments?post=77987"}],"version-history":[{"count":0,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/77987\/revisions"}],"wp:attachment":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/media?parent=77987"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/categories?post=77987"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/tags?post=77987"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}