GitHub Advisoryadvisory · npm
GHSA-62ch-8vmq-8xm7 figlet is vulnerable to denial of service via unbounded loop when whitespaceBreak is used with a small width
HIGH
Official page ↗
- Aliases
- CVE-2026-96780
- Ecosystem
- npm
- Packages
- figlet
- Severity
- High
- CVSS vector
- CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
- Weaknesses
- CWE-835
- Reviewed
- 2026-10-02
Affected packages
• npm figlet: < 1.11.3 → fixed in 1.11.3
Description
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.
Related
Alias · CVE (1)
- CVE-2026-96780 figlet.js is a FIG driver written in JavaScript that aims to implement the FIGfont specification. vulnerability
Weakness · CWE (1)
- CWE-835 Loop with Unreachable Exit Condition weakness
References
- https://github.com/patorjk/figlet.js/security/advisories/GHSA-62ch-8vmq-8xm7 web
- https://nvd.nist.gov/vuln/detail/CVE-2026-96780 advisory
- https://github.com/patorjk/figlet.js/pull/169 web
- https://github.com/patorjk/figlet.js/commit/cb2839d0e53aeafbd361e9587abc72e49e41cbb3 web
- https://github.com/patorjk/figlet.js package