# CVE-2024-53920

## Summary

- **CVE ID:** CVE-2024-53920
- **Severity:** HIGH
- **CVSS Score:** 7.8 (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)
- **CWE:** N/A
- **Published:** Nov 27, 2024
- **Last Modified:** Sep 14, 2026

## Description

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

- n/a — n/a (n/a)

## References

- [CNA](https://git.savannah.gnu.org/cgit/emacs.git/tree/ChangeLog.4)
- [CNA](https://git.savannah.gnu.org/cgit/emacs.git/tag/?h=emacs-30.0.92)
- [CNA](https://eshelyaron.com/posts/2024-11-27-emacs-aritrary-code-execution-and-how-to-avoid-it.html)
- [CNA](https://yhetil.org/emacs/CAFXAjY5f4YfHAtZur1RAqH34UbYU56_t6t2Er0YEh1Sb7-W=hg@mail.gmail.com/)
- [CNA](https://news.ycombinator.com/item?id=42256409)
- [CNA](https://git.savannah.gnu.org/cgit/emacs.git/tree/etc/NEWS?h=emacs-30.1)
- [CVE](https://lists.debian.org/debian-lts-announce/2025/02/msg00033.html)
- [CVE](http://www.openwall.com/lists/oss-security/2026/08/20/3)
- [CVE](http://www.openwall.com/lists/oss-security/2026/08/20/7)
- [CVE](http://www.openwall.com/lists/oss-security/2026/09/14/1)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.64%
- **EPSS Percentile:** 48.9

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-17._