{"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/cpes/cpe2.3athumbnail_projectthumbnailpython/feed.json","home_page_url":"https://feed.craftedsignal.io/","icon":"https://feed.craftedsignal.io/apple-touch-icon.png","items":[{"_cs_actors":[],"_cs_cpes":["cpe:2.3:a:thumbnail_project:thumbnail:*:*:*:*:*:python:*:*"],"_cs_cves":[{"cvss":9.8,"id":"CVE-2026-110650"}],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":["thumbnail (\u003c= 1.5)"],"_cs_severities":["critical"],"_cs_tags":[],"_cs_type":"advisory","_cs_vendors":[],"content_html":"\u003cp\u003eThe Python package 'thumbnail' (versions 1.5 and earlier) is vulnerable to OS command injection via the generate_thumbnail() function. This vulnerability arises because the package insufficiently sanitizes user-supplied file names or file paths before passing them to operating system calls. Specifically, the function utilizes 'os.system()' to execute external binaries - such as 'ffmpeg', 'convert', or 'unoconv' - to process media files. By crafting a filename containing shell metacharacters (e.g., semicolons, pipes, or ampersands), an attacker can escape the intended command context and execute arbitrary commands.\u003c/p\u003e\n\u003cp\u003eThis issue is significant for any web application or service that utilizes the 'thumbnail' package to process user-uploaded files. If exploited, the attacker executes code with the same privileges as the underlying Python process, which often possesses elevated permissions in server environments. Defenders should prioritize identifying instances of this library in their dependency tree and implementing strict input validation for filenames before they reach media processing functions.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAttacker identifies a web application or service that uses the 'thumbnail' Python package for file processing.\u003c/li\u003e\n\u003cli\u003eAttacker crafts a malicious payload in a filename (e.g., 'image.jpg; id \u0026gt; /tmp/out').\u003c/li\u003e\n\u003cli\u003eAttacker uploads or submits the malicious file to the target application.\u003c/li\u003e\n\u003cli\u003eThe application receives the file and invokes 'generate_thumbnail()' with the attacker-controlled filename.\u003c/li\u003e\n\u003cli\u003eThe 'generate_thumbnail()' function unsafely concatenates the filename into an 'os.system()' command string involving 'ffmpeg', 'convert', or 'unoconv'.\u003c/li\u003e\n\u003cli\u003eThe operating system shell interprets the injected metacharacters and executes the attacker's secondary command.\u003c/li\u003e\n\u003cli\u003eAttacker achieves remote code execution with the context and privileges of the Python application.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation allows for arbitrary OS command execution, leading to complete system compromise, unauthorized data access, or the deployment of persistent threats within the environment. Any application accepting user-provided files that are subsequently processed by the affected library is at high risk, potentially impacting a broad range of web services in sectors utilizing media processing.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eUpdate the 'thumbnail' package to a version beyond 1.5 if a security patch becomes available.\u003c/li\u003e\n\u003cli\u003eAudit application code for instances of 'thumbnail.generate_thumbnail()' to ensure all inputs are strictly validated against a whitelist of characters before processing.\u003c/li\u003e\n\u003cli\u003eDeploy file upload security controls to enforce strict naming conventions and file type validation to prevent the injection of shell metacharacters.\u003c/li\u003e\n\u003cli\u003eUtilize Software Composition Analysis (SCA) tools to identify and track the presence of 'thumbnail' (\u0026lt;= 1.5) across the production environment.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-10-14T16:35:51Z","date_published":"2026-10-14T16:35:51Z","id":"https://feed.craftedsignal.io/briefs/2026-10-thumbnail-rce/","summary":"The thumbnail Python package through version 1.5 is vulnerable to OS command injection in the generate_thumbnail() function, enabling arbitrary code execution via shell metacharacter injection into system calls.","title":"OS Command Injection in thumbnail Python Package","url":"https://feed.craftedsignal.io/briefs/2026-10-thumbnail-rce/"}],"language":"en","title":"CraftedSignal Threat Feed - Cpe:2.3:a:thumbnail_project:thumbnail:*:*:*:*:*:python:*:*","version":"https://jsonfeed.org/version/1.1"}