HIGH 8.8 Microsoft

CVE-2024-53920

In elisp-mode.el in GNU Emacs before 30.1, a user who chooses to invoke elisp-completion-at-point (for code completion) on untrusted Emacs Lisp source code can trigger unsafe Lisp macro expansion that allows attackers to execute arbitrary code. (This unsafe expansion also occurs if a user chooses to enable on-the-fly diagnosis that byte compiles untrusted Emacs Lisp source code.)

Microsoft Security Update 2024-Nov: In elisp-mode.el in GNU Emacs before 30.1, a user who chooses to invoke elisp-completion-at-point (for code completion) on untrusted Emacs Lisp source code can trigger unsafe Lisp macro expansion that allows attackers to execute arbitrary code. (This unsafe expansion also occurs if a user chooses to enable on-the-fly diagnosis that byte compiles untrusted Emacs Lisp source code.)

Affected Products

References

Published: 2024-11-12 · Source: Microsoft · Feed updated: 2026-11-07
This high severity vulnerability with a CVSS score of 8.8 was published on 2024-11-12 via Microsoft. Affected: cbl2 emacs 29.4-3 on CBL Mariner 2.0, azl3 emacs 29.4-3 on Azure Linux 3.0, cbl2 emacs 29.4-3 on CBL-Mariner 2.0.
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