---
title: "CVE-2026-118772: Joi - Denial of Service"
description: "Joi 17.1.1 to 17.13.9 and 18.3.1 contain a denial of service caused by inefficient regex processing in string().email({ multiple: true }) rule, letting attackers block the Node.js event loop, exploit requires attacker-controlled input with multiple option and no effective length limit."
url: https://panop.io/threat-heartbeat/CVE-2026-118772/
---

# CVE-2026-118772 Joi - Denial of Service

Joi 17.1.1 to 17.13.9 and 18.3.1 contain a denial of service caused by inefficient regex processing in string().email({ multiple: true }) rule, letting attackers block the Node.js event loop, exploit requires attacker-controlled input with multiple option and no effective length limit.

CVSS base score 7.5 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.47% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-118772)

## Details

Type

Denial of Service

Impact

Denial Of Service

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Published

29 October 2026

Updated

31 October 2026

Weakness

[CWE-1333](https://cwe.mitre.org/data/definitions/1333.html)

## Vendor fix

Update to versions 17.13.9 or 18.3.1 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-118772](https://nvd.nist.gov/vuln/detail/CVE-2026-118772)
- [https://github.com/hapijs/joi/pull/3163](https://github.com/hapijs/joi/pull/3163)
- [https://github.com/hapijs/joi/releases/tag/v17.13.9](https://github.com/hapijs/joi/releases/tag/v17.13.9)
- [https://github.com/hapijs/joi/releases/tag/v18.3.1](https://github.com/hapijs/joi/releases/tag/v18.3.1)
- [https://github.com/hapijs/joi/security/advisories/GHSA-4528-x5fx-h6hg](https://github.com/hapijs/joi/security/advisories/GHSA-4528-x5fx-h6hg)
- [https://github.com/hapijs/joi/commit/03dc1d909818503b06240dadc81e9227ed2649cf](https://github.com/hapijs/joi/commit/03dc1d909818503b06240dadc81e9227ed2649cf)
- [https://github.com/hapijs/joi/commit/807858d7480f5075b0610817e3e44230890fb18e](https://github.com/hapijs/joi/commit/807858d7480f5075b0610817e3e44230890fb18e)
- [https://github.com/hapijs/joi/pull/3162](https://github.com/hapijs/joi/pull/3162)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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