ESB-2026.4886

=========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2026.4886 USN-8262-1: Lua vulnerability 11 May 2026 =========================================================================== AUSCERT Security Bulletin Summary --------------------------------- Product: Lua Publisher: Ubuntu Operating System: Ubuntu Resolution: Patch/Upgrade CVE Names: CVE-2025-49844 Original Bulletin: https://ubuntu.com/security/notices/USN-8262-1 Comment: CVSS (Max): 9.9 CVE-2025-49844 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H) CVSS Source: Ubuntu Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H EPSS (Max): 8.5% (92nd) CVE-2025-49844 2026-05-10 - --------------------------BEGIN INCLUDED TEXT-------------------- USN-8262-1: Lua vulnerability Publication date 8 May 2026 Overview Lua could be made to crash or run programs as your login if it opened a specially crafted file. Releases 16.04 LTS --------------------------------------------------------------------------------- Open side navigation Packages o lua5.1 - Lua is an embeddable scripting language Details It was discovered that the Lua parser incorrectly handled garbage collection when processing specially crafted Lua scripts. A remote attacker could possibly use this issue to cause a denial of service or execute arbitrary code. Update instructions The problem can be corrected by updating your system to the following package versions: Ubuntu Release Package Version liblua5.1-0 - 5.1.5-8ubuntu1+esm1 Ubuntu Pro Fix available with 16.04 LTS Ubuntu Pro . xenial lua5.1 - 5.1.5-8ubuntu1+esm1 Ubuntu Pro Fix available with Ubuntu Pro . --------------------------------------------------------------------------------- References o CVE-2025-49844 Related notices o USN-8169-1 o USN-7893-1 o USN-7824-1 o USN-7824-2 o USN-7824-3 - --------------------------END INCLUDED TEXT---------------------- You have received this e-mail bulletin as a result of your organisation's registration with AUSCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AUSCERT's members. As AUSCERT did not write the document quoted above, AUSCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AUSCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: https://portal.auscert.org.au/bulletins/ =========================================================================== AUSCERT The University of Queensland, Brisbane QLD 4072 Australia e: auscert@auscert.org.au t: +61 (0)7 3365 4417 Allies in Cyber Security ===========================================================================