{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","feed_url":"https://feed.craftedsignal.io/tags/desktop-environment/feed.json","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cpes":[],"_cs_cves":[{"cvss":7.1,"id":"CVE-2026-16118"}],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":["xdgmime"],"_cs_severities":["high"],"_cs_tags":["vulnerability","buffer-overflow","linux","desktop-environment"],"_cs_type":"advisory","_cs_vendors":[],"content_html":"\u003cp\u003eA significant vulnerability, CVE-2026-16118, has been identified in the \u003ccode\u003exdgmime\u003c/code\u003e library, a component often used by applications for MIME type detection. This flaw manifests as a heap-based buffer overflow within the \u003ccode\u003e_xdg_mime_magic_parse_magic_line()\u003c/code\u003e function, located in the \u003ccode\u003exdgmimemagic.c\u003c/code\u003e file. The vulnerability specifically affects little-endian systems and can be triggered when a vulnerable application attempts to parse a specially crafted MIME magic file. An attacker can place this malicious file in a user-writable XDG data location, such as \u003ccode\u003e$XDG_DATA_HOME/mime/magic\u003c/code\u003e. When an application (e.g., via \u003ccode\u003eg_content_type_guess()\u003c/code\u003e) subsequently parses this file, incorrect pointer arithmetic during a byte-swap operation causes a 2-byte out-of-bounds write. This can lead to application instability, including crashes, or more critical memory corruption, potentially enabling arbitrary code execution. This vulnerability poses a risk to users of applications that rely on \u003ccode\u003exdgmime\u003c/code\u003e for MIME type identification, particularly if those applications process untrusted files.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAn attacker crafts a malicious MIME magic file designed to exploit the heap-based buffer overflow in \u003ccode\u003exdgmime\u003c/code\u003e.\u003c/li\u003e\n\u003cli\u003eThe attacker gains the ability to place this crafted MIME magic file into a user-writable XDG data location on a target system (e.g., \u003ccode\u003e$XDG_DATA_HOME/mime/magic\u003c/code\u003e). This could involve exploiting another vulnerability or social engineering.\u003c/li\u003e\n\u003cli\u003eA legitimate application on the target, which relies on \u003ccode\u003exdgmime\u003c/code\u003e for MIME type detection (e.g., a file manager or email client), attempts to parse the MIME magic files from known XDG data paths.\u003c/li\u003e\n\u003cli\u003eWhen the vulnerable application (running on a little-endian system) encounters the attacker-controlled MIME magic file, it initiates parsing using the \u003ccode\u003e_xdg_mime_magic_parse_magic_line()\u003c/code\u003e function.\u003c/li\u003e\n\u003cli\u003eDuring the parsing process, specifically when byte-swapping operations are performed, incorrect pointer arithmetic on the write side leads to a heap-based buffer overflow.\u003c/li\u003e\n\u003cli\u003eThis results in an out-of-bounds write of 2 bytes, corrupting adjacent memory regions.\u003c/li\u003e\n\u003cli\u003eThe memory corruption causes the application to crash, resulting in a denial of service, or, in more severe scenarios, could be leveraged by the attacker to achieve arbitrary code execution.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eThe successful exploitation of CVE-2026-16118 primarily leads to application instability. Victims would experience application crashes, resulting in denial of service for the affected software. Depending on the memory layout and the attacker's capabilities, the memory corruption could be exploited further to achieve arbitrary code execution, granting the attacker control over the compromised application's process and potentially the system if the application runs with elevated privileges. No specific victim counts or targeted sectors are currently disclosed, but any system utilizing \u003ccode\u003exdgmime\u003c/code\u003e in a vulnerable configuration is at risk.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003ePatch CVE-2026-16118 immediately by updating the \u003ccode\u003exdgmime\u003c/code\u003e library to a version that addresses this heap-based buffer overflow. Consult your distribution or software vendor for official updates.\u003c/li\u003e\n\u003cli\u003eImplement file integrity monitoring on critical XDG data locations, such as \u003ccode\u003e$XDG_DATA_HOME/mime/magic\u003c/code\u003e, to detect unauthorized modifications.\u003c/li\u003e\n\u003cli\u003eReview applications that parse MIME magic files to understand their dependency on \u003ccode\u003exdgmime\u003c/code\u003e and potential exposure to CVE-2026-16118.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-07-17T20:27:21Z","date_published":"2026-07-17T20:27:21Z","id":"https://feed.craftedsignal.io/briefs/2026-07-xdgmime-heap-buffer-overflow/","summary":"A heap-based buffer overflow vulnerability exists in the `xdgmime` library, specifically within the `_xdg_mime_magic_parse_magic_line()` function, which can be triggered on little-endian systems when an application parses an attacker-controlled MIME magic file in a user-writable XDG data location, leading to an application crash or memory corruption.","title":"CVE-2026-16118: Heap-Based Buffer Overflow in xdgmime","url":"https://feed.craftedsignal.io/briefs/2026-07-xdgmime-heap-buffer-overflow/"}],"language":"en","title":"CraftedSignal Threat Feed - Desktop-Environment","version":"https://jsonfeed.org/version/1.1"}