CVE-2026-42327 vulnerabilities

Vulnerabilities for packages: sdp-k8s-injector, guestproxyagent, rustls-openssl-client, sentry-cli, typst, deno, rpm-sequoia, sccache, valkey-ldap, rustup, ztunnel-fips, komodo, vector, sqlx, bootc...

CVE-2026-41898 vulnerabilities

Vulnerabilities for packages: sdp-k8s-injector, guestproxyagent, rustls-openssl-client, sentry-cli, typst, deno, rpm-sequoia, sccache, valkey-ldap, rustup, ztunnel-fips, komodo, vector, sqlx, bootc...

CVE-2026-41898 vulnerabilities

Vulnerabilities for packages: sqlx, rpm-sequoia, vector, rustup, sdp-k8s-injector, deno, sccache...

JLSEC-2026-107 Deno permission escalation vulnerability via open of privileged files with missing `--deny` flag

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 t...

JLSEC-2026-102 Interactive `run` permission prompt spoofing via improper ANSI neutralization

Summary Arbitrary program names without any ANSI filtering allows any malicious program to clear the first 2 lines of a opspawnchild or opkill prompt and replace it with any desired text. Details The main entry point comes down to the ability to override what the API control says 40process.js...

JLSEC-2026-103 Insufficient permission checking in `Deno.makeTemp*` APIs

Impact Insufficient validation of parameters in Deno.makeTemp APIs would allow for creation of files outside of the allowed directories. This may allow the user to overwrite important files on the system that may affect other systems. A user may provide a prefix or suffix to a Deno.makeTemp API...

JLSEC-2026-108 Deno's AES GCM authentication tags are not verified

Summary This affects AES-256-GCM and AES-128-GCM in Deno, introduced by commit 0d1beed. Specifically, the authentication tag is not being validated. This means tampered ciphertexts or incorrect keys might not be detected, which breaks the guarantees expected from AES-GCM. Older versions of Deno...

JLSEC-2026-100 Deno is vulnerable to race condition via interactive permission prompt spoofing

Impact Multi-threaded programs were able to spoof interactive permission prompt by rewriting the prompt to suggest that program is waiting on user confirmation to unrelated action. A malicious program could clear the terminal screen after permission prompt was shown and write a generic message li...

JLSEC-2026-115 Deno has an incomplete fix for command-injection prevention on Windows — case-insensitive extension bypass

Summary A prior patch aimed to block spawning Windows batch/shell files by returning an error when a spawned path’s extension matched .bat or .cmd. That check performs a case-sensitive comparison against lowercase literals and therefore can be bypassed when the extension uses alternate casing for...

JLSEC-2026-114 Deno node:crypto doesn't finalize cipher

Summary The vulnerability allows an attacker to have infinite encryptions. This can lead to naive attempts at brute forcing, as well as more refined attacks with the goal to learn the server secrets. PoC js import crypto from "node:crypto"; const key = crypto.randomBytes32; const iv =...

JLSEC-2026-105 Deno's `deno_runtime` vulnerable to interactive permission prompt spoofing via improper ANSI stripping

Summary A maliciously crafted permission request can show the spoofed permission prompt by inserting a broken ANSI escape sequence into the request contents. Details In the patch for CVE-2023-28446, Deno is stripping any ANSI escape sequences from the permission prompt, but permissions given to t...

JLSEC-2026-104 Deno's improper suffix match testing for `DENO_AUTH_TOKENS`

Summary Deno improperly checks that an import specifier's hostname is equal to or a child of a token's hostname, which can cause tokens to be sent to servers they shouldn't be sent to. An auth token intended for example.com may be sent to notexample.com. Details authtokens.rs uses a simple endswi...

JLSEC-2026-101

Versions of the package deno before 1.31.0 are vulnerable to Regular Expression Denial of Service ReDoS due to the upgradeWebSocket function, which contains regexes in the form of /s,s/, used for splitting the Connection/Upgrade header. A specially crafted Connection/Upgrade header can be used to...

JLSEC-2026-113 Deno is Vulnerable to Command Injection on Windows During Batch File Execution

Summary Deno versions up to 2.5.1 are vulnerable to Command Line Injection attacks on Windows when batch files are executed. Details In Windows, CreateProcess always implicitly spawns cmd.exe if a batch file .bat, .cmd, etc. is being executed even if the application does not specify it via the...

JLSEC-2026-98 Deno's static imports inside dynamically imported modules do not adhere to permission checks

Impact Modules that are dynamically imported through import or new Worker might have been able to bypass network and file system permission checks when statically importing other modules. In Deno 1.5.x and 1.6.x only programs dynamically importing especially transitively untrusted code are...

JLSEC-2026-99

Deno =1.14.0 file sandbox does not handle symbolic links correctly. When running Deno with specific write access, the Deno.symlink method can be used to gain access to any directory...

JLSEC-2026-106

Deno is a JavaScript, TypeScript, and WebAssembly runtime with secure defaults. By using ANSI escape sequences and a race between libc::tcflush0, libc::TCIFLUSH and reading standard input, it's possible to manipulate the permission prompt and force it to allow an unsafe action regardless of the...

JLSEC-2026-109 Deno run with --allow-read and --deny-read flags results in allowed

Deno is a JavaScript, TypeScript, and WebAssembly runtime. Starting in version 1.41.3 and prior to versions 2.1.13, 2.2.13, and 2.3.2, deno run --allow-read --deny-read main.ts results in allowed, even though 'deny' should be stronger. The result is the same with all global unary permissions give...

JLSEC-2026-116 Deno has a Command Injection via Incomplete shell metacharacter blocklist in `node:child_process`

Summary A command injection vulnerability exists in Deno's node:childprocess implementation. Reproduction javascript import spawnSync from "node:childprocess"; import as fs from "node:fs"; // Cleanup try fs.unlinkSync'/tmp/rceproof'; catch // Create legitimate script...

JLSEC-2026-112 Deno's --deny-read check does not prevent permission bypass

Summary Deno.FsFile.prototype.stat and Deno.FsFile.prototype.statSync are not limited by the permission model check --deny-read=./. It's possible to retrieve stats from files that the user do not have explicit read access to the script is executed with --deny-read=./ Similar APIs like Deno.stat a...