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CVE-2024-53920

7.8 · HIGH

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 t…

Published Nov 27, 2024CWE-94EPSS 0.60%

Overview

CVE-2024-53920 is a high-severity vulnerability. It was published on November 27, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical 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.)

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refeshelyaron.com/posts/2024-11-27-emacs-aritrary-code-execution-and-how-to-avoid-it.htmlRefgit.savannah.gnu.org/cgit/emacs.git/tag/?h=emacs-30.0.92Refgit.savannah.gnu.org/cgit/emacs.git/tree/ChangeLog.4Refgit.savannah.gnu.org/cgit/emacs.git/tree/etc/NEWS?h=emacs-30.1Refnews.ycombinator.com/item?id=42256409Refyhetil.org/emacs/CAFXAjY5f4YfHAtZur1RAqH34UbYU56_t6t2Er0YEh1Sb7-W=hg@mail.gmail.com/Refwww.openwall.com/lists/oss-security/2026/08/20/3Refwww.openwall.com/lists/oss-security/2026/08/20/7Reflists.debian.org/debian-lts-announce/2025/02/msg00033.html

How CyberStrike helps

Frequently asked questions

What is CVE-2024-53920?

CVE-2024-53920 is a high-severity vulnerability. It was published on November 27, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2024-53920?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2024-53920?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2024-53920?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2024-53920 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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