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, React Native, JavaScript, TypeScript, Kotlin and Swift, plus Android and iOS development and CI/CD practices. It is circulating among developers tracking tech job openings.

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.

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.

A software engineer with 16 years of experience is halfway through a double MSc in artificial intelligence with EPITA and EM, and has been sharing the transition openly. They describe asking an AI tool to produce a video about their career switch, saying it took nine versions to get right. The posts touch on coding, JavaScript, career change and inclusive tech communities, drawing attention from developers weighing similar moves.

Security researchers are flagging CVE-2026-102147, a critical vulnerability in Kiteworks Core carrying a CVSS score of 9.3. The flaw is a stored cross-site scripting weakness that could let an unauthenticated attacker plant crafted content which then executes arbitrary JavaScript in the session of an administrator who views it, potentially giving attackers privileged access. Organizations running Kiteworks are urged to review the advisory and apply patches.

A developer maintains a small open-source calculator that estimates the cost of closing an unexplained gender pay gap. The tool is built in JavaScript and is designed to make zero network calls, so salary data entered by employers or analysts never leaves the user's browser. The privacy-first approach is drawing attention in open-source and HR communities.

A developer who built a piano reference tool for the browser found it simple to mix up three different numbering systems: piano key numbers, MIDI note numbers, and frequencies. The JavaScript-based reference clarifies the differences for programmers and musicians working on web audio projects, and it is drawing attention in coding and music communities.

A critical vulnerability, CVE-2026-102829 with a CVSS score of 9.2, has been disclosed in simple-git, the widely used Node.js package for running Git commands from JavaScript. The flaw stems from the argv-parser package, where versions before 2.0.1 omit VISUAL from the GitEnvKeys in parseEnv, affecting how prepareEnv handles the environment. Developers are being urged to check their dependencies and update.

A developer blog post walks through showing calculation results using HTML output, covering CSS, HTML and JavaScript techniques for rendering computed values in a web page. The piece is being shared among web development communities, with readers flagging it for its practical front-end coding examples.

GitLab has released fixes for CVE-2026-84739, a high-severity vulnerability (CVSS 8.7) affecting all versions of GitLab CE/EE from 13.11 onwards. Under certain conditions, the flaw could have let an authenticated user execute arbitrary JavaScript in another user's browser. Patches are available in versions 19.2.7, 19.3.3 and 19.4.1, and self-hosted installations are urged to upgrade promptly.