{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","favicon":"https://feed.craftedsignal.io/favicon-32x32.png","feed_url":"https://feed.craftedsignal.io/products/hmailserver-6.0.0-b1-through-6.3.7/feed.json","home_page_url":"https://feed.craftedsignal.io/","icon":"https://feed.craftedsignal.io/apple-touch-icon.png","items":[{"_cs_actors":[],"_cs_cpes":[],"_cs_cves":[{"cvss":7.5,"id":"CVE-2026-126621"}],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":["hMailServer (6.0.0-B1 through 6.3.7)"],"_cs_severities":["high"],"_cs_tags":[],"_cs_type":"advisory","_cs_vendors":[],"content_html":"\u003cp\u003eProgressive Robot hMailServer versions 6.0.0-B1 through 6.3.7 on Windows pass configuration file paths to OpenSSL using Latin-1 encoding. Windows/OpenSSL behavior interprets these paths as UTF-8.\u003c/p\u003e\n\u003cp\u003eIf a configured path contains non-ASCII characters, a local attacker capable of creating files or folders in accessible locations can cause the server to load malicious files instead of intended configuration files. This may lead to:\u003c/p\u003e\n\u003cul\u003e\n\u003cli\u003eAuthentication bypass via a rogue certificate authority.\u003c/li\u003e\n\u003cli\u003eInterception and modification of object store messages.\u003c/li\u003e\n\u003cli\u003eExfiltration of ACME-managed private keys.\u003c/li\u003e\n\u003cli\u003eDenial of service by preventing TLS ports from starting.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp\u003eThis vulnerability is not present in default configurations, as default settings use ASCII file names and disable features like client-certificate authentication, the object store, and ACME. Linux builds are not affected.\u003c/p\u003e\n","date_modified":"2026-11-11T14:04:16Z","date_published":"2026-11-11T14:04:16Z","id":"https://feed.craftedsignal.io/briefs/2026-11-hmailserver-path-encoding-cve-2026-126621/","summary":"hMailServer on Windows interprets file paths using Latin-1, while OpenSSL interprets them as UTF-8. A local attacker may exploit this path ambiguity to cause authentication bypass, unauthorized data access, or service disruption.","title":"Progressive Robot hMailServer: TLS configuration file path ambiguity (CVE-2026-126621)","url":"https://feed.craftedsignal.io/briefs/2026-11-hmailserver-path-encoding-cve-2026-126621/"}],"language":"en","title":"CraftedSignal Threat Feed - HMailServer (6.0.0-B1 Through 6.3.7)","version":"https://jsonfeed.org/version/1.1"}