{"id":64119,"date":"2025-08-17T11:38:48","date_gmt":"2025-08-17T11:38:48","guid":{"rendered":""},"modified":"2025-08-29T22:43:47","modified_gmt":"2025-08-30T04:43:47","slug":"cve-2025-55157-vim-text-editor-use-after-free-vulnerability-resulting-in-memory-corruption","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-55157-vim-text-editor-use-after-free-vulnerability-resulting-in-memory-corruption\/","title":{"rendered":"CVE-2025-55157: Vim Text Editor Use-After-Free Vulnerability Resulting in Memory Corruption<\/strong>"},"content":{"rendered":"

Overview<\/strong><\/p>\n

The recently discovered vulnerability CVE-2025-55157 has raised concerns in the cybersecurity community due to its potential to compromise systems or lead to data leakage. The vulnerability lies within Vim, the widely used open-source command line text editor. Users who are running Vim versions between 9.1.1231 and 9.1.1400 are at risk of this vulnerability, which can lead to memory corruption<\/a> during the processing of nested tuples in Vim script. The severity of this threat is highlighted by its high CVSS Score, making it an issue that demands immediate attention.<\/p>\n

Vulnerability Summary<\/strong><\/p>\n

CVE ID: CVE-2025-55157
\nSeverity: High – 8.8 CVSS Score
\nAttack Vector: Direct user interaction via script execution<\/a>
\nPrivileges Required: User-level privileges
\nUser Interaction: Required
\nImpact: Memory corruption potentially leading<\/a> to system compromise or data leakage<\/p>\n

Affected Products<\/strong><\/p>\n

Product | Affected Versions<\/p>\n

Vim | 9.1.1231 to 9.1.1400<\/p>\n

How the Exploit Works<\/strong><\/p>\n

The vulnerability CVE-2025-55157 is triggered when processing<\/a> nested tuples in Vim script, specifically when an error occurs during the evaluation. This error can trigger a use-after-free scenario in Vim’s internal tuple reference management<\/a>. This occurs when the tuple_unref() function accesses memory that has already been freed due to improper lifetime handling, which in turn leads to memory corruption<\/a>.<\/p>\n

Conceptual Example Code<\/strong><\/p>\n

Given the nature of this vulnerability, it is exploited through the execution of Vim scripts that contain nested tuples. An example of this might look like the following:<\/p>\n

\" Nested Tuples\nlet nested_tuple = [(1,2), (3,4)]\n\" Triggering error during evaluation\nexecute 'let (' . nested_tuple[0] . ',) = [1]'<\/code><\/pre>\n
This pseudocode demonstrates a conceptual scenario where the vulnerability might be exploited. It creates a nested tuple and then triggers an error during evaluation, which could potentially lead to memory corruption<\/a>.<\/p>\n
Mitigation Guidance<\/strong><\/p>\n
Users are urged to apply the vendor patch as soon as possible, as this is the most secure solution. The vulnerability has been patched in Vim version<\/a> 9.1.1400, so updating to this or a later version will resolve the issue. In the meantime, or if an immediate update is not possible, it is recommended to use a Web Application Firewall (WAF) or Intrusion Detection System (IDS) as a temporary mitigation measure. These systems can detect and block attempts to exploit the vulnerability<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview The recently discovered vulnerability CVE-2025-55157 has raised concerns in the cybersecurity community due to its potential to compromise systems or lead to data leakage. The vulnerability lies within Vim, the widely used open-source command line text editor. Users who are running Vim versions between 9.1.1231 and 9.1.1400 are at risk of this vulnerability, which […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[1],"tags":[],"vendor":[],"product":[],"attack_vector":[],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-64119","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t