{"id":77881,"date":"2026-02-24T20:03:41","date_gmt":"2026-02-24T16:33:41","guid":{"rendered":"https:\/\/afaghhosting.net\/blog\/cve-2026-27590-caddy-unicode-case-folding-length-expansion-causes-incorrect-split_path-index-script_name-path_info-confusion-in-fastcgi-transport\/"},"modified":"2026-02-24T20:03:41","modified_gmt":"2026-02-24T16:33:41","slug":"cve-2026-27590-caddy-unicode-case-folding-length-expansion-causes-incorrect-split_path-index-script_name-path_info-confusion-in-fastcgi-transport","status":"publish","type":"post","link":"https:\/\/afaghhosting.net\/blog\/cve-2026-27590-caddy-unicode-case-folding-length-expansion-causes-incorrect-split_path-index-script_name-path_info-confusion-in-fastcgi-transport\/","title":{"rendered":"CVE-2026-27590 &#8211; Caddy: Unicode case-folding length expansion causes incorrect split_path index (SCRIPT_NAME\/PATH_INFO confusion) in FastCGI transport"},"content":{"rendered":"<p>CVE ID : CVE-2026-27590<\/p>\n<p>Published :  Feb. 24, 2026, 4:33 p.m. | 32\u00a0minutes ago<\/p>\n<p>Description : Caddy is an extensible server platform that uses TLS by default. Prior to version 2.11.1, Caddy&#8217;s FastCGI path splitting logic computes the split index on a lowercased copy of the request path and then uses that byte index to slice the original path. This is unsafe for Unicode because `strings.ToLower()` can change UTF-8 byte length for some characters. As a result, Caddy can derive an incorrect `SCRIPT_NAME`\/`SCRIPT_FILENAME` and `PATH_INFO`, potentially causing a request that contains `.php` to execute a different on-disk file than intended (path confusion). In setups where an attacker can control file contents (e.g., upload features), this can lead to unintended PHP execution of non-.php files (potential RCE depending on deployment). Version 2.11.1 fixes the issue.<\/p>\n<p>Severity: 0.0 | NA<\/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-2026-27590 Published : Feb. 24, 2026, 4:33 p.m. | 32\u00a0minutes ago Description : Caddy is an extensible server platform that uses TLS by default. Prior to version 2.11.1, Caddy&#8217;s FastCGI path splitting logic computes the split index on a lowercased copy of the request path and then uses that byte index to &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-77881","post","type-post","status-publish","format-standard","hentry","category-vulnerability"],"_links":{"self":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/77881","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=77881"}],"version-history":[{"count":0,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/77881\/revisions"}],"wp:attachment":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/media?parent=77881"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/categories?post=77881"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/tags?post=77881"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}