JavaScript

Developer Dietrich Gebert released Ponytail, an open-source JavaScript tool hosted on GitHub that instructs AI coding agents to behave like 'the laziest senior dev in the room' — writing as little code as possible. Its stated philosophy is that 'the best code is the code you never wrote', pushing assistants to prefer reuse and deletion over generating new code.

Blockchain.com has opened a full-time position for a Senior React Native Engineer based in Buenos Aires, Argentina. The role calls for experience with React Native, JavaScript, TypeScript, Kotlin and Swift, covering both Android and iOS development along with CI/CD practices. The listing is being shared across developer job boards and circulated among developers tracking mobile engineering opportunities in the crypto industry.

A guide covering six common currency mistakes developers make is drawing attention. It covers the pitfalls of using floating-point numbers for money, incorrect decimal place handling, currency symbol confusion, mixing up base and quote currencies in exchange rates, and relying on stale rates. Practical code examples in JavaScript and Python show how to handle money correctly in software, a topic of recurring interest in fintech and web development circles.

The Svelte team has announced the release of SvelteKit 3, the latest major version of its web application framework. Details of the update are laid out in a blog post on the project's site, and developers are discussing the release on Hacker News, where it is drawing attention from the JavaScript and frontend community.

A newly published CVE, CVE-2026-78847, describes a critical remote code execution vulnerability in the gray-matter JavaScript front-matter parser. All versions are affected: code parsing JavaScript front matter uses eval() in lib/engines.js, letting attackers run arbitrary code. The flaw carries a CVSS score of 9.8 and no patch exists yet. Security commentators urge developers to avoid processing untrusted JavaScript front matter and to update as soon as a fix is released.

A new vulnerability entry, EUVD-2026-81594, has been published for the vm2 JavaScript sandbox library maintained by patriksimek. The flaw carries a low CVSS v3.1 score of 2.3 out of 10 and stems from the external module allowlist using a raw prefix test, meaning a sibling package sharing a name prefix is incorrectly treated as allowlisted. The entry was updated on 1 October 2026.

A maximum-severity security flaw, tracked as EUVD-2026-81591, has been disclosed in vm2, the Node.js sandbox library maintained by Patrik Simek. The vulnerability, rated 10.0 out of 10 under CVSS v3.1, allows the NodeVM component to replace the host process TLS trust store, potentially undermining certificate validation. The advisory was updated on 1 October 2026 and appears in the EU vulnerability database.

A high-severity vulnerability, EUVD-2026-81593, has been catalogued affecting vm2, the JavaScript sandbox library maintained by Patrik Simek. The flaw scores 9.3 out of 10 on CVSS v3.1 and allows a sandbox escape on Node.js 26 via a stale PromiseThenLookupChain protector. Security teams using vm2 to isolate untrusted code are being urged to review the advisory and assess exposure.

A high-severity vulnerability, EUVD-2026-81589, has been catalogued in vm2, the JavaScript sandbox library maintained by Patrik Simek. Scored 9.4 out of 10 under CVSS v3.1, the flaw involves vm2's crypto builtin loading attacker-supplied native code through the setEngine function, a path that could allow sandbox escapes or arbitrary code execution. The advisory was updated on October 1, 2026, and security teams are being urged to review any systems relying on vm2 for isolating untrusted JavaScript.