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Fencer Vulns
low 3.7

CVE-2026-90771 json

joi before 17.13.8 and 18.2.9 Prototype Pollution via messages

published 2026-09-13 56 d ago modified 2026-10-05 34 d ago also GHSA-wr44-6hxh-3jwq , EUVD-2026-76992

cvss
3.7
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 33%
public exploits
0
none known

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 returned object's prototype, breaking downstream code relying on Object.prototype methods.

Patch / fix

  • npm joi 17.13.8, 18.2.9
  • hapijs joi 17.13.8, 18.2.9
  • grafana12.4 hummingbird 1 12.4.10-0.3.hum1
  • grafana13.2 hummingbird 1 13.2.1-0.4.hum1
  • grafana13.1 hummingbird 1 13.1.3-0.9.hum1

red hat advisories RHSA-2026:67610RHSA-2026:67605RHSA-2026:67573

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-90771 updated cvss 5.9

joi: joi: Prototype Pollution via custom messages

  • Red Hat Gatekeeper 3 gatekeeper/gatekeeper-rhel9 Red Hat Migration Toolkit for Containers rhmtc/openshift-migration-ui-rhel8 Red Hat Build of Podman Desktop rh-podman-desktop.git 1.1.0 Red Hat Data Grid 8 redhat-datagrid-maven-repository.zip 8.6.1.CR1 Red Hat Enterprise Linux 8 grafana, grafana-pcp, grafana-loki, grafana-mssql, grafana-mysql, grafana-selinux, +10 more Red Hat Enterprise Linux 9 grafana, grafana-selinux, grafana 12.4.3-2.el10
    +5 more products
    Red Hat Enterprise Linux 10 grafana 12.4.3-2.el10 Red Hat OpenShift AI (RHOAI) rhoai/odh-dashboard-rhel9, rhoai/odh-mod-arch-maas-rhel9, rhoai/odh-mod-arch-automl-rhel9, rhoai/odh-mod-arch-gen-ai-rhel9, rhoai/odh-mod-arch-mlflow-rhel9, rhoai/odh-mod-arch-autorag-rhel9, +2 more Red Hat OpenShift Container Platform 4 openshift4/ose-agent-installer-ui-rhel9 Red Hat OpenShift Container Platform 5 openshift5/ose-agent-installer-ui-rhel9 Red Hat OpenShift Dev Spaces devspaces/dashboard-rhel9
    affected: workaround, no fix available “Upgrade joi to 17.13.8, 18.2.9, or later. Avoid passing untrusted data to Joi message configuration until upgraded.”
  • Red Hat Hardened Images grafana13.1 13.1.3-0.9.hum1, grafana13.2 13.2.1-0.4.hum1, grafana12.4 12.4.10-0.3.hum1
    fixed: vendor fix “Upgrade joi to 17.13.8, 18.2.9, or later. Avoid passing untrusted data to Joi message configuration until upgraded.” RHSA-2026:67610

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
53 d ago

Exploit prediction

0.39% chance of exploitation in the next 30 days, higher than 33% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/hapijs/joi/issues/3150 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 4.0 6.3 CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
CNA 3.1 3.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
CNA 4.0 6.3 CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
GitHub 3.1 3.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

Affected packages

ecosystem package affected fixed in
npm joi
<17.13.8
>=18.0.0, <18.2.9
17.13.8
18.2.9

Affected products

  • hapijs joi

Classification

Weakness
  • CWE-1321 Improperly Controlled Modification of Object Prototype Attributes

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.