Practical Security Guides For Your Team

Your application uses an outdated version of Axios, a popular tool for making web requests. A known flaw in this version means that a malicious server — or an unexpectedly large response — can keep sending data even after your app has told it to stop, eventually overwhelming your server and causing it to crash or become unresponsive. The fix is a straightforward library upgrade.

Your application uses a JavaScript helper library called Underscore.js that has a flaw in two of its functions. Under specific conditions, an attacker could send specially crafted deeply-nested data to your server, causing it to crash and become temporarily unavailable. Think of it like sending a letter with 4,500 envelopes nested inside each other — the library tries to open every one and runs out of room.

Your website uses Next.js, a popular web framework, which includes a feature that automatically resizes and optimises images for visitors. A flaw in versions before 16.1.7 means this feature stores an unlimited number of image variants on disk with no cap — like a filing cabinet with no limit on how many folders can be added. An attacker could deliberately flood this cache to fill up your server's storage and take your site offline.

Your website uses a feature in Next.js that automatically resizes and optimises images. A flaw in versions before 15.5.10 means an attacker could point this feature at an extremely large image and force your server to run out of memory — crashing your site. The attacker needs to be able to host or control a large image on a domain your site is already configured to trust.

Your application uses a popular networking library called Axios to make web requests. A flaw in this library means that if your app accepts data from users, parses it as JSON, and passes it into Axios, an attacker can send a single specially crafted request that instantly crashes your server. Think of it like a specific combination lock that, when entered, causes the door to fall off its hinges rather than just staying locked.

Your website is running an older version of Next.js (a popular web framework) that has a known weakness in how it handles images. An attacker could repeatedly trigger the image processing feature in a way that overloads your server, making your site slow or temporarily unavailable. Upgrading to the latest version closes this gap.

A flaw in a specific Next.js feature called Partial Prerendering (PPR) allows anyone on the internet to crash your web server by sending a specially crafted request — no login required. This only affects self-hosted Next.js applications running in a specific 'minimal mode' configuration with PPR turned on. If your app is hosted on Vercel's platform, you are not affected.

Your application is using a very old version of lodash (3.10.1), a popular JavaScript helper library, that contains a known security flaw. An attacker who can send crafted data to your application could use this flaw to disrupt your service or, in some cases, interfere with how your application behaves. The fix is a straightforward library upgrade.

Your application uses a version of Axios — a very common networking library — that has a flaw allowing an attacker to send a specially crafted request that forces your server to consume all available memory and crash. This causes downtime for your users and can be triggered with a single request, requiring no login or special access.