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figlet is vulnerable to denial of service via unbounded loop when whitespaceBreak is used with a small widthGHSA-62ch-8vmq-8xm7

Fix: patorjk/figlet.js#169

GHSA-62ch-8vmq-8xm7 is a CWE-835 vulnerability in figlet. A fix is available for figlet — see the affected versions and patch details below.

Also known asCVE-2026-96780
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Oct 23, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for GHSA-62ch-8vmq-8xm7.

EPSS Exploitation Probability

via FIRST.org ↗
0.4%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs34th percentile — riskier than 34% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

Real-World Exposure

1 pkg affected

How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.

14Kother npm packages depend on this — each one inherits the vulnerability until it's patched upstream
figletnpm
1.3Mdownloads / week

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.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
📦npmfigletall versions1.11.3npm install figlet@1.11.3

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for figlet, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update figlet to 1.11.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-62ch-8vmq-8xm7 is resolved across your whole dependency graph.

  3. Workarounds

    Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Frequently Asked Questions

### 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 rea
O3 Security · Impact-Aware SCA

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figlet is vulnerable to denial of service via unbounded loop…