CVE-2024-34346: high-severity vulnerability in denoland deno
Deno contains a permission escalation via open of privileged files with missing `--deny` flag
Published · Updated
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.5epss 0.4%
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.
CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Affected products
denoland · denoRelated CVEs — denoland deno
In the same product, most dangerous first.
CVE-2026-27190HIGHDeno has a Command Injection via Incomplete shell metacharacter blocklist in node:child_processEPSS 2.5%CVE-2024-27933HIGHDeno arbitrary file descriptor close via `op_node_ipc_pipe()` leading to permission prompt bypassEPSS 2.3%CVE-2025-61787HIGHDeno is Vulnerable to Command Injection on Windows During Batch File ExecutionEPSS 2.1%CVE-2026-32260HIGHCommand Injection via incomplete shell metacharacter blocklist in node:child_process (bypass of CVE-2026-27190 fix)EPSS 1.6%CVE-2026-103473CRITICALDeno 2.7.0 through 2.9.7 Command Injection via node:child_processEPSS 1.5%CVE-2022-24783CRITICALSandbox bypass leading to arbitrary code execution in DenoEPSS 1.1%