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Fencer Vulns
medium 5.9

CVE-2026-34043 json

Serialize JavaScript has CPU Exhaustion Denial of Service via crafted array-like objects

published 2026-03-27 7 mo ago modified 2026-09-10 1 mo ago also EUVD-2026-17288 , GHSA-qj8w-gfj5-8c6v

cvss
5.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 42%
public exploits
0
none known

Summary

Serialize JavaScript to a superset of JSON that includes regular expressions and functions. Prior to version 7.0.5, there is a Denial of Service (DoS) vulnerability caused by CPU exhaustion. When serializing a specially crafted "array-like" object (an object that inherits from Array.prototype but has a very large length property), the process enters an intensive loop that consumes 100% CPU and hangs indefinitely. This issue has been patched in version 7.0.5.

Patch / fix

  • npm serialize-javascript 7.0.5
  • verizon serialize-javascript 7.0.5
  • yahoo serialize 7.0.5
  • node-serialize-javascript Debian 14 7.0.5+~5.0.4-1

debian advisories DEBIAN-CVE-2026-34043

  • dotnet8.0 RHEL 8 8.0.127-1.el8_10
  • dotnet-sdk-8.0 RHEL 8 8.0.127-1.el8_10
  • dotnet-hostfxr-8.0 RHEL 8 8.0.27-1.el8_10
  • dotnet-runtime-8.0 RHEL 8 8.0.27-1.el8_10
  • dotnet-sdk-dbg-8.0 RHEL 8 8.0.127-1.el8_10
  • dotnet-templates-8.0 RHEL 8 8.0.127-1.el8_10
  • aspnetcore-runtime-8.0 RHEL 8 8.0.27-1.el8_10
  • dotnet-runtime-dbg-8.0 RHEL 8 8.0.27-1.el8_10

red hat advisories RHSA-2026:24335RHSA-2026:24334RHSA-2026:24332RHSA-2026:21291RHSA-2026:21293RHSA-2026:21286

  • dotnet-sdk-8.0 AlmaLinux 10 8.0.127-1.el10_2
  • dotnet-hostfxr-8.0 AlmaLinux 10 8.0.27-1.el10_2
  • dotnet-runtime-8.0 AlmaLinux 10 8.0.27-1.el10_2
  • dotnet-sdk-dbg-8.0 AlmaLinux 10 8.0.127-1.el10_2
  • dotnet-templates-8.0 AlmaLinux 10 8.0.127-1.el10_2
  • aspnetcore-runtime-8.0 AlmaLinux 10 8.0.27-1.el10_2
  • dotnet-runtime-dbg-8.0 AlmaLinux 10 8.0.27-1.el10_2
  • dotnet-apphost-pack-8.0 AlmaLinux 10 8.0.27-1.el10_2

almalinux advisories ALSA-2026:21286ALSA-2026:21291ALSA-2026:21293

  • dotnet8.0 Rocky Linux 10 8.0.127-1.el10_2
  • dotnet8.0 Rocky Linux 9 8.0.127-1.el9_8
  • dotnet8.0 Rocky Linux 8 8.0.127-1.el8_10

rocky linux advisories RLSA-2026:21286RLSA-2026:21293RLSA-2026:21291

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-2026-34043 updated cvss 5.9

serialize-javascript: serialize-javascript: Denial of Service via specially crafted array-like object serialization

  • Red Hat Cryostat 4 cryostat-openshift-console-plugin-npm
    affected: workaround, no fix available
  • Red Hat Logging Subsystem for Red Hat OpenShift openshift-logging/kibana6-rhel8, openshift-logging/elasticsearch6-rhel9, openshift-logging/logging-curator5-rhel9, openshift-logging/elasticsearch-proxy-rhel9, openshift-logging/elasticsearch-rhel9-operator, openshift-logging/elasticsearch-operator-bundle Red Hat Network Observability Operator network-observability/network-observability-console-plugin-rhel9, network-observability/network-observability-console-plugin-compat-rhel9 Red Hat Node HealthCheck Operator workload-availability/node-remediation-console-rhel9, workload-availability/node-healthcheck-rhel9-operator, workload-availability/node-healthcheck-operator-bundle, workload-availability/node-healthcheck-must-gather-rhel9
    affected: workaround, no fix available “Fix deferred”
  • Red Hat 3scale API Management Platform 2 3scale-amp20/system, 3scale-amp21/system, 3scale-amp22/system, 3scale-amp24/system, 3scale-amp25/system, 3scale-amp26/system, +2 more
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Ansible Automation Platform 2 automation-gateway, automation-eda-controller, ansible-on-clouds/aoc-azure-aap-installer-rhel9
    affected: workaround, no fix available “Fix deferred”
  • Red Hat build of Apache Camel - HawtIO 4 serialize-javascript
    affected: workaround, no fix available
  • Red Hat build of Apicurio Registry 2 serialize-javascript
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Build of Keycloak serialize-javascript
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Build of Podman Desktop podman-desktop-macos-1-0, podman-desktop-windows-1-0
    affected: workaround, no fix available
show 25 more
  • Red Hat Enterprise Linux 8 grafana, grafana-loki, grafana-mssql, grafana-mysql, grafana-selinux, grafana-graphite, +8 more Red Hat Enterprise Linux 9 grafana, grafana-selinux
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Fuse 7 serialize-javascript
    affected: workaround, no fix available “Fix deferred”
  • Red Hat OpenShift GitOps openshift-gitops-1/argocd-rhel8, openshift-gitops-1/argocd-rhel9
    affected: workaround, no fix planned “Will not fix”
  • Red Hat OpenShift Virtualization 4 container-native-virtualization/kubevirt-console-plugin-rhel9 Red Hat Process Automation 7 serialize-javascript Red Hat Quay 3 quay/quay-rhel8 Red Hat Single Sign-On 7 serialize-javascript Red Hat streams for Apache Kafka 2 serialize-javascript
    affected: workaround, no fix available “Fix deferred”
  • Red Hat CodeReady Linux Builder EUS (v.9.6) dotnet-sdk-8.0-source-built-artifacts 8.0.127-1.el9_6
    fixed: vendor fix RHSA-2026:24335
  • Red Hat Enterprise Linux AppStream (v. 8) dotnet8.0 8.0.127-1.el8_10, dotnet-sdk-8.0 8.0.127-1.el8_10, dotnet-hostfxr-8.0 8.0.27-1.el8_10, dotnet-runtime-8.0 8.0.27-1.el8_10, dotnet-sdk-dbg-8.0 8.0.127-1.el8_10, dotnet-templates-8.0 8.0.127-1.el8_10, +6 more
    fixed: vendor fix RHSA-2026:21291
  • Red Hat Enterprise Linux AppStream (v. 9) dotnet8.0 8.0.127-1.el9_8, dotnet-sdk-8.0 8.0.127-1.el9_8, dotnet-hostfxr-8.0 8.0.27-1.el9_8, dotnet-runtime-8.0 8.0.27-1.el9_8, dotnet-sdk-dbg-8.0 8.0.127-1.el9_8, dotnet-templates-8.0 8.0.127-1.el9_8, +6 more
    fixed: vendor fix RHSA-2026:21293
  • Red Hat Enterprise Linux AppStream (v. 10) dotnet8.0 8.0.127-1.el10_2, dotnet-sdk-8.0 8.0.127-1.el10_2, dotnet-hostfxr-8.0 8.0.27-1.el10_2, dotnet-runtime-8.0 8.0.27-1.el10_2, dotnet-sdk-dbg-8.0 8.0.127-1.el10_2, dotnet-templates-8.0 8.0.127-1.el10_2, +6 more
    fixed: vendor fix RHSA-2026:21286
  • Red Hat Enterprise Linux AppStream E4S (v.9.4) dotnet8.0 8.0.127-1.el9_4, dotnet-host 8.0.27-1.el9_4, dotnet-sdk-8.0 8.0.127-1.el9_4, dotnet-hostfxr-8.0 8.0.27-1.el9_4, dotnet-runtime-8.0 8.0.27-1.el9_4, dotnet-sdk-dbg-8.0 8.0.127-1.el9_4, +8 more
    fixed: vendor fix RHSA-2026:24334
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) dotnet8.0 8.0.127-1.el10_0, dotnet-sdk-8.0 8.0.127-1.el10_0, dotnet-hostfxr-8.0 8.0.27-1.el10_0, dotnet-runtime-8.0 8.0.27-1.el10_0, dotnet-sdk-dbg-8.0 8.0.127-1.el10_0, dotnet-templates-8.0 8.0.127-1.el10_0, +6 more
    fixed: vendor fix RHSA-2026:24332
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) dotnet8.0 8.0.127-1.el9_6, dotnet-sdk-8.0 8.0.127-1.el9_6, dotnet-hostfxr-8.0 8.0.27-1.el9_6, dotnet-runtime-8.0 8.0.27-1.el9_6, dotnet-sdk-dbg-8.0 8.0.127-1.el9_6, dotnet-templates-8.0 8.0.127-1.el9_6, +6 more
    fixed: vendor fix RHSA-2026:24335
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) dotnet-sdk-8.0-source-built-artifacts 8.0.127-1.el9_8
    fixed: vendor fix RHSA-2026:21293
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) dotnet-sdk-8.0-source-built-artifacts 8.0.127-1.el10_2
    fixed: vendor fix RHSA-2026:21286
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) dotnet-sdk-8.0-source-built-artifacts 8.0.127-1.el10_0
    fixed: vendor fix RHSA-2026:24332
  • Red Hat Enterprise Linux CRB (v. 8) dotnet-sdk-8.0-source-built-artifacts 8.0.127-1.el8_10
    fixed: vendor fix RHSA-2026:21291
  • Red Hat OpenShift Container Platform 4.16 openshift4/ose-networking-console-plugin-rhel9 1782211435
    fixed: vendor fix RHSA-2026:29082
  • Red Hat OpenShift Container Platform 4.17 openshift4/ose-networking-console-plugin-rhel9 1782185607
    fixed: vendor fix RHSA-2026:34099
  • Red Hat OpenShift Container Platform 4.18 openshift4 1778256287
    fixed: vendor fix RHSA-2026:17448
  • Red Hat OpenShift Container Platform 4.19 openshift4/ose-networking-console-plugin-rhel9 1779256322
    fixed: vendor fix RHSA-2026:20041
  • Red Hat OpenShift Container Platform 4.20 openshift4 1778644858
    fixed: vendor fix RHSA-2026:17468
  • Red Hat OpenShift Container Platform 4.21 openshift4 1778532500
    fixed: vendor fix RHSA-2026:17474
  • Red Hat Openshift Data Foundation 4.18 odf4/cephcsi-rhel9 1786705347, odf4/odf-cli-rhel9 1786705938, odf4/mcg-core-rhel9 1786705558, odf4/odf-console-rhel9 1786706577, odf4/mcg-rhel9-operator 1786705646, odf4/ocs-rhel9-operator 1786705802, +13 more
    fixed: vendor fix RHSA-2026:56431
  • Red Hat Cryostat 4 serialize-javascript
    not affected: component not present
  • Red Hat Gatekeeper 3 gatekeeper/gatekeeper-rhel9
    not affected: vulnerable code not in execute path
  • Red Hat 3scale API Management Platform 2 3scale-amp2/system-rhel9
    not affected: component not present

17 more not affected in the full advisory

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
none
Automatable
no
Technical impact
partial
Assessed
7 mo ago

Exploit prediction

0.49% chance of exploitation in the next 30 days, higher than 42% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
GitHub 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 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 serialize-javascript
>=5.0.0, <7.0.5
7.0.5

Affected products

  • yahoo serialize-javascript

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption
  • CWE-834 Excessive Iteration

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.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.