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HIGH

GHSA-62ch-8vmq-8xm7

figlet is vulnerable to denial of service via unbounded loop when whitespaceBreak is used with a small width

Quick fix

GHSA-62ch-8vmq-8xm7 — figlet: upgrade to the fixed version with the command below.

npm install figlet@1.11.3

Details

### Impact A denial-of-service (infinite loop) can occur in `text()` / `textSync()` when **both**: - `whitespaceBreak: true` is set, **and** - `width` is set smaller than the rendered width of a single FIGlet character. Under these conditions `breakWord()` could never find a valid break point, so the word-wrapping loop in `generateFigTextLines()` never terminated. This pins a CPU core and grows memory without bound, blocking the Node.js event loop.

### Severity Low or Medium. Triggering requires a non-default configuration (`whitespaceBreak: true`) and an attacker-controlled `width` value reaching `text()`/`textSync()`. This library is typically used with fixed options, where this is not reachable. Applications that pass an untrusted `width` together with `whitespaceBreak` on a request path are affected.

### Patches Fixed in **figlet 1.11.3**. `breakWord()` now always makes forward progress (emitting an over-wide character on its own line), and FIGlet header parsing now rejects invalid values (e.g. zero/negative height).

### Workarounds Do not expose `width` to untrusted input, or leave `whitespaceBreak` disabled (the default), or upgrade to 1.11.3.

Are you affected?

Enter the version of the package you're using.

Affected packages

npm/figlet
Introduced in: 0Fixed in: 1.11.3
Fixnpm install figlet@1.11.3

References