Emacs arbitrary code execution flaw
Sean Whitton has announced that the original fix for an arbitrary code execution flaw in Emacs (CVE-2024-53920) was incomplete. Bas Alberts discovered that viewing or editing untrusted files in modes other than Emacs's Lisp mode can also result in arbitrary code execution. This problem affects all Emacs versions affected by CVE-2024-53920.
- ▪Sean Whitton has announced that the original fix for an arbitrary code execution flaw in Emacs (CVE-2024-53920) was incomplete.
- ▪Bas Alberts discovered that viewing or editing untrusted files in modes other than Emacs's Lisp mode can also result in arbitrary code execution.
- ▪This problem affects all Emacs versions affected by CVE-2024-53920.
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Story provenance
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Record
| Original publisher | LWN.net (Linux Weekly News) |
| Canonical URL | https://lwn.net/Articles/1094224/ |
| Publication time | Mon, 14 Sep 2026 15:20:00 +0000 |
| Retrieval time | 2026-09-14T15:21:51.307Z |
| Last seen | 2026-09-14T15:21:51.307Z |
| Headline source | Publisher (no WeSearch rewrite) |
| Excerpt source | publisher body |
| Excerpt method | First ~120 words (~800 chars) of extracted publisher body, fair-use limited. |
| Summary | WeSearch · cerebras-chat (WeSearch summarizer) |
| Summary source text | contentText |
| Citation coverage | Summary is a WeSearch-generated derivative; primary citation is the original publisher URL. |
| Cluster | T8HcMOtJsY5R · 1 stories |
| Cluster logic | Grouped by semantic title/content similarity across sources within a rolling window. Same-publisher template collisions are excluded from coverage comparison. |
| Ranking reason | Story pages are not engagement-ranked. Hub feeds use recency, with optional source-diversified chronological ordering (cap consecutive stories per source). No personalized ranking. |
| Publisher visit | Yes — open original |
| Substitutes article? | No — link-out required for full text |
Rights status (four layers)
WeSearch handling by dimension
| Indexing | May the item be indexed (stored, ranked, made findable)? | Allowed |
| Snippet | May a short excerpt of the publisher's text be shown? | Allowed |
| AI summary | May WeSearch generate its own short summary of the article? | Limited |
| Retrieval / RAG | May the content be exposed for third-party retrieval-augmented generation? | Not asserted |
| Model training | May the content be used to train AI models? | Not asserted |
| Commercial reuse | May the content be reused commercially? | Not permitted |
Basis: Derived from the published RSS/Atom feed. Contact: [email protected]. Reviewed: 2026-07-24.
Opening excerpt (first ~120 words) tap to expand
Sean Whitton has announced that the original fix for an arbitrary code execution flaw in Emacs (CVE-2024-53920) was incomplete. Bas Alberts discovered that viewing or editing untrusted files in modes other than Emacs's Lisp mode can also result in arbitrary code execution. This problem affects all Emacs versions affected by CVE-2024-53920. This means Emacs 24 and newer, and possibly also older versions. A minimal fix, attached, is queued up for release with Emacs 31.2. We (the Emacs upstream maintainers) don't expect to backport the fix to older Emacs releases ourselves. LWN covered the original vulnerability in December 2024. to post comments
Excerpt limited to ~120 words for fair-use compliance. The full article is at LWN.net (Linux Weekly News).