{"id":"CVE-2026-90771","title":"joi before versions 17.13.8 and 18.2.9 contains a prototype pollution vulnerability in the messages compilation function that accepts __proto__ as an error code","summary":"joi before versions 17.13.8 and 18.2.9 contains a prototype pollution vulnerability in the messages compilation function that accepts __proto__ as an error code. Attackers can supply __proto__ keys in custom messages to replace the retur…","severity":"low","cvss":3.7,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","cwe":["CWE-1321","CWE-915"],"vendor":"hapijs","product":"joi","affected":["joi >= 16.0.0 < 17.13.8","joi >= 18.0.0 < 18.2.9"],"published":"2026-09-13","updated":"2026-09-16","sourceUpdated":"2026-09-16T15:18:42.280","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-90771","references":[{"url":"https://github.com/hapijs/joi","label":"disclosure@vulncheck.com"},{"url":"https://github.com/hapijs/joi/blob/v18.2.8/lib/messages.js","label":"disclosure@vulncheck.com"},{"url":"https://github.com/hapijs/joi/commit/5b8333c9177e08b4ef4ed02903c2d657084e7afb","label":"disclosure@vulncheck.com"},{"url":"https://github.com/hapijs/joi/issues/3150","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/joi-before-17.13.8-and-18.2.9-prototype-pollution-via-messages","label":"disclosure@vulncheck.com"},{"url":"https://github.com/hapijs/joi/issues/3150","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90771.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-90771"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532688"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-90771"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-90771"},{"url":"https://access.redhat.com/errata/RHSA-2026:67610"},{"url":"https://access.redhat.com/errata/RHSA-2026:67573"},{"url":"https://access.redhat.com/errata/RHSA-2026:67605"}],"tags":["nvd","cve.org","exploit-available","csaf","vex","red-hat","score-dispute"],"epss":0.00258,"epssPercentile":0.17794,"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-16T14:02:28.580545Z"},"scores":{"nvd":3.7,"cna":3.7,"vendor":5.9},"ingestedAt":"2026-09-14T15:23:07.471Z","patched":["hardened_images"],"slug":"CVE-2026-90771","body":"## Overview\n\njoi before versions 17.13.8 and 18.2.9 contains a prototype pollution vulnerability in the messages compilation function that accepts __proto__ as an error code. Attackers can supply __proto__ keys in custom messages to replace the returned object's prototype, breaking downstream code relying on Object.prototype methods.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Gatekeeper 3, Migration Toolkit for Containers, Red Hat Build of Podman Desktop, Red Hat Data Grid 8, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, … · no fix planned: Gatekeeper 3, Migration Toolkit for Containers, Red Hat Build of Podman Desktop, Red Hat Data Grid 8, … · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90771.json)\n- **RHSA-2026:67610** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-15 · [advisory](https://access.redhat.com/errata/RHSA-2026:67610)\n- **RHSA-2026:67573** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-15 · [advisory](https://access.redhat.com/errata/RHSA-2026:67573)\n- **RHSA-2026:67605** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-15 · [advisory](https://access.redhat.com/errata/RHSA-2026:67605)","depth":"twilight","depthScore":32,"depthScoreParts":{"impact":20.4,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":205311,"id":"CVE-2026-90771","ts":1789570707986,"field":"exploit_available","old":"false","new":"true"},{"seq":205310,"id":"CVE-2026-90771","ts":1789570707986,"field":"cvss","old":"5.9","new":"3.7"},{"seq":205309,"id":"CVE-2026-90771","ts":1789570707986,"field":"severity","old":"medium","new":"low"},{"seq":202783,"id":"CVE-2026-90771","ts":1789403715943,"field":"cvss","old":"3.7","new":"5.9"},{"seq":202782,"id":"CVE-2026-90771","ts":1789403715943,"field":"severity","old":"low","new":"medium"}]}