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Public proof of conceptFix available

CVE-2024-53920

A public proof of concept exists; no exploitation attested.

  • Published2024-11-27
  • Fixed in30.1
  • WeaknessCWE-94

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.)

Timeline

dates in UTC
  1. 2024-11-2715:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2024-53920?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2024-53920?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · CISA-ADP
Gnu emacs
BranchAffectedFixed in
30.1< 30.130.1
30.0= 30.0.92no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • emacsAlmaLinux:9all versions · fixed in 1:27.2-11.el9_5.2and 4 other packages
  • emacsAlmaLinux:9all versions · fixed in 1:27.2-14.el9_6.2and 4 other packages
  • emacsAlmaLinux:8all versions · fixed in 1:26.1-15.el8_10and 4 other packages

Full record on NVD

Fix

  1. Update Gnu emacs to 30.1

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

Technical details

CVSS v3 Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published
2024-11-27
Last Modified
2026-09-21
NVD status
Modified

Frequently asked questions

What is 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.)

Is CVE-2024-53920 actively exploited?

A proof-of-concept exploit exists for CVE-2024-53920, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2024-53920?

CVE-2024-53920 has a CVSS v3 base score of 7.8 (HIGH severity), with vector string CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

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