joi: quadratic-time split in `string().email({ multiple: true })` allows denial of service

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

• CISA KEV Not listed.
• EPSS 0.0047, the 40th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

1. 29 Oct 2026, 18:13 UTC Confirmed by the CVE List
2. 29 Oct 2026, 19:17 UTC Confirmed by NVD
3. 31 Oct 2026, 13:32 UTC First seen by agentprime
4. 31 Oct 2026, 13:32 UTC Confirmed by OSV

Sources

• GitHub Advisory Database: GHSA-4528-x5fx-h6hg
• OSV: GHSA-4528-x5fx-h6hg
• github.com/hapijs/joi/security/advisories/GHSA-4528-x5fx-h6hg
• nvd.nist.gov/vuln/detail/CVE-2026-118772
• github.com/hapijs/joi/pull/3162
• github.com/hapijs/joi/pull/3163
• github.com/hapijs/joi/commit/03dc1d909818503b06240dadc81e9227ed2649cf
• github.com/hapijs/joi/commit/807858d7480f5075b0610817e3e44230890fb18e
• github.com/hapijs/joi
• github.com/hapijs/joi/releases/tag/v17.13.9
• github.com/hapijs/joi/releases/tag/v18.3.1

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.