CVE-2024-34346 Deno contains a permission escalation via open of privileged files with missing `--deny` flag
Attackers can escalate privileges by reading or writing privileged system files when filesystem access is granted, bypassing intended sandbox restrictions.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2024-34346?
CVE-2024-34346 is a high-severity vulnerability in denoland deno, published on 7 May 2024. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Deno is a JavaScript, TypeScript, and WebAssembly runtime with secure defaults. The Deno sandbox may be unexpectedly weakened by allowing file read/write access to privileged files in various locations on Unix and Windows platforms. For example, reading `/proc/self/environ` may provide access equivalent to `--allow-env`, and writing `/proc/self/mem` may provide access equivalent to `--allow-all`. Users who grant read and write access to the entire filesystem may not realize that these access to these files may have additional, unintended consequences. The documentation did not reflect that this practice should be undertaken to increase the strength of the security sandbox. Users who run code with `--allow-read` or `--allow-write` may unexpectedly end up granting additional permissions via file-system operations. Deno 1.43 and above require explicit `--allow-all` access to read or write `/etc`, `/dev` on unix platform (as well as `/proc` and `/sys` on linux platforms), and any path starting with `\\` on Windows.
Weakness: CWE-863
Which versions are affected by CVE-2024-34346?
2 open source packages ship an affected version, including deno. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
deno crates.io | All versions | 1.43.1 |
deno crates.io | All versions | 1.43.1 |
Products include Deno Deno.
How do I fix CVE-2024-34346?
Upgrade deno to 1.43.1 or later.
Is CVE-2024-34346 being exploited?
There is no known exploitation of CVE-2024-34346 in the wild and no public exploit code.
Other vulnerabilities in denoland deno
- CVE-2023-28445 Deno improperly handles resizable ArrayBuffer
- CVE-2022-24783 Sandbox bypass leading to arbitrary code execution in Deno
- CVE-2021-32619 Static imports inside dynamically imported modules do not adhere to permission checks
- CVE-2026-22863 Deno node:crypto doesn't finalize cipher
- CVE-2024-27936 Deno interactive permission prompt spoofing via improper ANSI stripping
Sources
Also known as GHSA-23rx-c3g5-hv9w, JLSEC-2026-107.