{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata — refreshed continuously.","feed_url":"https://feed.craftedsignal.io/tags/cve-2026-34982/","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cves":[{"cvss":8.2,"id":"CVE-2026-34982"}],"_cs_exploited":false,"_cs_products":[],"_cs_severities":["critical"],"_cs_tags":["vim","modeline","sandbox-bypass","code-execution","cve-2026-34982"],"_cs_type":"advisory","_cs_vendors":[],"content_html":"\u003cp\u003eVim, a widely used open-source command-line text editor, is susceptible to a critical vulnerability (CVE-2026-34982) affecting versions prior to 9.2.0276. This flaw allows a malicious actor to execute arbitrary operating system commands by crafting a specific file that exploits a bypass in the modeline sandbox. The vulnerability arises from the \u003ccode\u003ecomplete\u003c/code\u003e, \u003ccode\u003eguitabtooltip\u003c/code\u003e, and \u003ccode\u003eprintheader\u003c/code\u003e options lacking the \u003ccode\u003eP_MLE\u003c/code\u003e flag, and the \u003ccode\u003emapset()\u003c/code\u003e function not having a \u003ccode\u003echeck_secure()\u003c/code\u003e call, which permits exploitation from sandboxed expressions. Successful exploitation requires a user to open a specially crafted file. This poses a significant risk, as attackers could leverage this vulnerability to gain unauthorized access to systems, escalate privileges, or perform other malicious activities. The vulnerability was patched in commit 9.2.0276.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAttacker crafts a malicious file containing a modeline with embedded OS commands.\u003c/li\u003e\n\u003cli\u003eThe crafted file is distributed to the target via social engineering or other means.\u003c/li\u003e\n\u003cli\u003eVictim opens the malicious file using a vulnerable version of Vim (prior to 9.2.0276).\u003c/li\u003e\n\u003cli\u003eVim parses the modeline in the file.\u003c/li\u003e\n\u003cli\u003eDue to the missing \u003ccode\u003eP_MLE\u003c/code\u003e flag in \u003ccode\u003ecomplete\u003c/code\u003e, \u003ccode\u003eguitabtooltip\u003c/code\u003e, or \u003ccode\u003eprintheader\u003c/code\u003e options, the modeline is executed without proper sandboxing.\u003c/li\u003e\n\u003cli\u003eAlternatively, the \u003ccode\u003emapset()\u003c/code\u003e function, lacking a \u003ccode\u003echeck_secure()\u003c/code\u003e call, is abused from the sandboxed expression in the modeline.\u003c/li\u003e\n\u003cli\u003eArbitrary OS commands embedded in the modeline are executed with the privileges of the user running Vim.\u003c/li\u003e\n\u003cli\u003eAttacker achieves code execution, potentially leading to system compromise, data exfiltration, or further malicious activities.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of CVE-2026-34982 can lead to arbitrary code execution on the affected system. The severity is compounded by the widespread use of Vim in various environments, including development, system administration, and general text editing. The impact could range from data breaches and malware installation to complete system compromise, depending on the commands executed and the privileges of the user opening the malicious file. While the exact number of potential victims is unknown, the ubiquity of Vim makes this vulnerability a significant concern for any organization using unpatched versions.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eUpgrade Vim to version 9.2.0276 or later to patch CVE-2026-34982.\u003c/li\u003e\n\u003cli\u003eImplement the provided Sigma rule to detect the execution of potentially malicious Vim commands based on process execution patterns.\u003c/li\u003e\n\u003cli\u003eMonitor network traffic for suspicious outbound connections originating from Vim processes after the execution of potentially malicious files, using network connection logs.\u003c/li\u003e\n\u003cli\u003eUse endpoint detection and response (EDR) solutions to identify and block suspicious processes spawned by Vim, leveraging process creation logs.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-04-06T16:16:38Z","date_published":"2026-04-06T16:16:38Z","id":"/briefs/2026-04-vim-modeline-bypass/","summary":"A critical vulnerability in Vim versions prior to 9.2.0276 allows arbitrary OS command execution via a crafted file that bypasses the modeline sandbox due to missing security checks, potentially leading to code execution.","title":"Vim Modeline Sandbox Bypass Vulnerability (CVE-2026-34982)","url":"https://feed.craftedsignal.io/briefs/2026-04-vim-modeline-bypass/"}],"language":"en","title":"CraftedSignal Threat Feed — Cve-2026-34982","version":"https://jsonfeed.org/version/1.1"}