{"id":61832,"date":"2026-06-10T16:56:15","date_gmt":"2026-06-10T16:56:15","guid":{"rendered":"https:\/\/zero.redgem.net\/?p=61832"},"modified":"2026-06-10T16:56:15","modified_gmt":"2026-06-10T16:56:15","slug":"snappy-binary-path-is-never-shell-escaped-due-to-an-inverted-isexecutable-check","status":"publish","type":"post","link":"https:\/\/zero.redgem.net\/?p=61832","title":{"rendered":"Snappy: Binary path is never shell-escaped due to an inverted is_executable check_CVE-2026-46643"},"content":{"rendered":"<p>{&#8220;lastseen&#8221;:&#8221;&#8221;,&#8221;description&#8221;:&#8221;Snappy is a PHP library allowing thumbnail, snapshot or PDF generation from a url or a html page. Prior to version 1.7.1, on POSIX, escapeshellarg(\u2018\/usr\/bin\/wkhtmltopdf\u2019) returns the literal string \u2018\/usr\/bin\/wkhtmltopdf\u2019 with the single-quote characters included. is_executable() then looks for a file whose actual name contains those quote characters, which essentially never exists. The safe branch is dead code and $command always falls through to the raw, unescaped value. The rest of the arguments (options, input, output) are escaped correctly, so injection has to land in the binary string itself. That happens whenever the binary path is sourced from configuration that is user-influenced, derived from environment variables that ultimately come from request data, or concatenated with any user-controlled fragment. 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Prior to version 1.7.1, on POSIX, escapeshellarg(\u2018\/usr\/bin\/wkhtmltopdf\u2019)&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[6,8,16,12,15,13,7,11,5],"class_list":["post-61832","post","type-post","status-publish","format-standard","hentry","category-category_cve","tag-cve","tag-cvss","tag-cvss-75","tag-exploit","tag-high","tag-news","tag-security","tag-tapic","tag-vulnerability"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Snappy: Binary path is never shell-escaped due to an inverted is_executable check_CVE-2026-46643 - zero redgem<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/zero.redgem.net\/?p=61832\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Snappy: Binary path is never shell-escaped due to an inverted is_executable check_CVE-2026-46643 - zero redgem\" \/>\n<meta property=\"og:description\" content=\"{&#8220;lastseen&#8221;:&#8221;&#8221;,&#8221;description&#8221;:&#8221;Snappy is a PHP library allowing thumbnail, snapshot or PDF generation from a url or a html page. 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