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Fencer Vulns
high 7.5

CVE-2019-20922 json

Regular Expression Denial of Service in Handlebars

published 2020-09-30 6 y ago modified 2026-07-08 4 mo ago also GHSA-62gr-4qp9-h98f , EUVD-2022-0849

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.7%
EPSS 3.7% chance of exploitation in 30 days, percentile 89%
public exploits
0
none known

Summary

Handlebars before 4.4.5 allows Regular Expression Denial of Service (ReDoS) because of eager matching. The parser may be forced into an endless loop while processing crafted templates. This may allow attackers to exhaust system resources.

Patch / fix

  • npm handlebars 4.4.5
  • handlebarsjs handlebars 4.4.5
  • rhvm rhev manager 4.4 4.4.3.8-0.1.el8ev
  • ovirt-engine rhev manager 4.4 4.4.3.8-0.1.el8ev
  • ovirt-web-ui rhev manager 4.4 1.6.5-1.el8ev
  • ovirt-engine-setup rhev manager 4.4 4.4.3.8-0.1.el8ev
  • ovirt-engine-tools rhev manager 4.4 4.4.3.8-0.1.el8ev
  • ovirt-engine-backend rhev manager 4.4 4.4.3.8-0.1.el8ev
  • ovirt-engine-restapi rhev manager 4.4 4.4.3.8-0.1.el8ev
  • ovirt-engine-dbscripts rhev manager 4.4 4.4.3.8-0.1.el8ev

red hat advisories RHSA-2020:5179

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-2019-20922 updated cvss 7.5

nodejs-handlebars: an endless loop while processing specially-crafted templates leads to DoS

  • Red Hat OpenShift Service Mesh 1 servicemesh-grafana, servicemesh-grafana-prometheus Red Hat OpenShift Container Platform 3.11 kibana, openshift3/grafana Red Hat OpenShift Container Platform 4 kibana, openshift4/ose-grafana
    affected: no fix planned “Will not fix”
  • Red Hat Quay v3 quay/quay-rhel8 v3.6.0-62
    fixed: vendor fix RHSA-2021:3917
  • Red Hat OpenShift Container Platform 4.6 openshift4/ose-logging-kibana6 v4.6.0-202106181629.p0.git.40f3e72
    fixed: vendor fix RHSA-2021:2500
  • Red Hat RHEL-8-RHEV-S-4.4 - Red Hat Virtualization Engine 4.4 ovirt-web-ui 1.6.5-1.el8ev
    fixed: vendor fix RHSA-2020:5179
  • Red Hat RHPAM 7.13.1 async
    fixed: vendor fix RHSA-2023:1334
  • Red Hat OpenShift Service Mesh 1 kiali Red Hat Quay v3 quay/clair-rhel8 v3.6.0-70, quay/quay-builder-rhel8 v3.6.0-44, quay/quay-operator-rhel8 v3.6.0-43, quay/quay-operator-bundle v3.6.0-48, quay/quay-bridge-operator-rhel8 v3.6.0-40, quay/quay-bridge-operator-bundle v3.6.0-35, +3 more Red Hat Advanced Cluster Management for Kubernetes 2 handlebars Red Hat OpenShift Container Platform 4.6 openshift4/ose-logging-fluentd v4.6.0-202106181629.p0.git.40f3e72, openshift4/ose-logging-curator5 v4.6.0-202106181629.p0.git.40f3e72, openshift4/ose-elasticsearch-operator v4.6.0-202106181629.p0.git.c07c7ab, openshift4/ose-logging-elasticsearch6 v4.6.0-202106181629.p0.git.40f3e72, openshift4/ose-cluster-logging-operator v4.6.0-202106181629.p0.git.c7e8377, openshift4/ose-metering-ansible-operator v4.6.0-202106160917.p0.git.d74112d, +1 more Red Hat Virtualization 4 ovirt-engine-ui-extensions Red Hat RHEL-8-RHEV-S-4.4 - Red Hat Virtualization Engine 4.4 rhvm 4.4.3.8-0.1.el8ev, engine-db-query 1.6.2-1.el8ev, ovirt-engine 4.4.3.8-0.1.el8ev, rhvm-branding-rhv 4.4.6-1.el8ev, ovirt-engine-dwh 4.4.3.1-1.el8ev, ovirt-log-collector 4.4.4-1.el8ev, +26 more
    not affected: vulnerable code not present

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

Exploit prediction

3.69% chance of exploitation in the next 30 days, higher than 89% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 7.8 AV:N/AC:L/Au:N/C:N/I:N/A:C
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
npm handlebars
>=4.0.0, <4.4.5
4.4.5

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption

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.