flatted: Unbounded recursion DoS in parse() revive phase
Priority HIGH 72CWE-674Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Partial Red Hat: 8 fixed, 9 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-674.
Summary
flatted is a circular JSON parser. Prior to 3.4.0, flatted's parse() function uses a recursive revive() phase to resolve circular references in deserialized JSON. When given a crafted payload with deeply nested or self-referential $ indices, the recursion depth is unbounded, causing a stack overflow that crashes the Node.js process. This vulnerability is fixed in 3.4.0.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00898 59th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial flatted (WebReflection): 3.4.0flatted (npm): 3.4.0Red Hat: 9 advisoriesRed Hat: 8 fixed, 9 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| WebReflection | flatted | before 3.4.0 | 3.4.0 | Patch available | CNA |
| — | flatted (npm) | before 3.4.0 | 3.4.0 | Patch available | GHSA-25h7-pfq9-p65f |
- flatted VendorWebReflection Affected before 3.4.0 Fixed in 3.4.0 Patch available CNA
- flatted (npm) Vendor— Affected before 3.4.0 Fixed in 3.4.0 Patch available GHSA-25h7-pfq9-p65f
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:webreflection:flatted:*:*:*:*:*:node.js:*:* | before 3.4.0 | Vulnerable | WebReflection |
- cpe:2.3:a:webreflection:flatted:*:*:*:*:*:node.js:*:* Versions before 3.4.0 Vulnerable ·WebReflection
Remediation
- Fix · CNA flatted (WebReflection) Fixed in 3.4.0
- Fix · GHSA-25h7-pfq9-p65f flatted (npm) Fixed in 3.4.0 Advisory →
Red Hat 9 advisories
- RHSA-2026:86618 Released 2026-10-21 · Red Hat rating CriticalNew container image: rhceph-9.2
- Red Hat Ceph Storage 9.2 registry.redhat.io/rhceph/rhceph-9-rhel10
- RHSA-2026:40945 Released 2026-07-16 · Red Hat rating ImportantRed Hat Edge Manager Version 1.1.3 Security Update
- Red Hat Edge Manager 1.1 registry.redhat.io/rhem/flightctl-alert-exporter-rhel10, registry.redhat.io/rhem/flightctl-alertmanager-proxy-rhel10, registry.redhat.io/rhem/flightctl-api-rhel10 +11
- RHSA-2026:40118 Released 2026-07-15 · Red Hat rating ImportantRed Hat Edge Manager Version 1.1.3 Security Update
- Red Hat Edge Manager 1.1 registry.redhat.io/rhem/flightctl-alert-exporter-rhel9, registry.redhat.io/rhem/flightctl-alertmanager-proxy-rhel9, registry.redhat.io/rhem/flightctl-api-rhel9 +11
Show 6 more Red Hat advisories
- RHSA-2026:36651 Released 2026-07-08 · Red Hat rating ImportantRed Hat Edge Manager Version 1.0.3 Security Update
- Red Hat Edge Manager 1.0 registry.redhat.io/rhem/flightctl-alert-exporter-rhel9, registry.redhat.io/rhem/flightctl-alertmanager-proxy-rhel9, registry.redhat.io/rhem/flightctl-api-rhel9 +9
- RHSA-2026:34342 Released 2026-07-01 · Red Hat rating CriticalCluster Observability Operator 1.5.0
- Cluster Observability Operator 1.5 registry.redhat.io/cluster-observability-operator/distributed-tracing-console-plugin-pf4-rhel9, registry.redhat.io/cluster-observability-operator/distributed-tracing-console-plugin-pf5-rhel9, registry.redhat.io/cluster-observability-operator/distributed-tracing-console-plugin-pf6-rhel9 +9
- RHSA-2026:21772 Released 2026-05-28 · Red Hat rating ImportantRed Hat OpenShift Dev Spaces 3.28.0 Release.
- Red Hat OpenShift Dev Spaces 3.28 registry.redhat.io/devspaces/code-rhel9, registry.redhat.io/devspaces/dashboard-rhel9, registry.redhat.io/devspaces/openvsx-rhel9 +3
- RHSA-2026:13826 Released 2026-05-05 · Red Hat rating CriticalRed Hat Developer Hub 1.9.4 release.
- Red Hat Developer Hub 1.9 registry.redhat.io/rhdh/rhdh-hub-rhel9, registry.redhat.io/rhdh/rhdh-rhel9-operator
- RHSA-2026:9742 Released 2026-04-22 · Red Hat rating CriticalRed Hat Developer Hub 1.8.6 release.
- Red Hat Developer Hub 1.8 registry.redhat.io/rhdh/rhdh-hub-rhel9, registry.redhat.io/rhdh/rhdh-rhel9-operator
- RHSA-2026:5807 Released 2026-03-25 · Red Hat rating ImportantRHOAI 2.16.4 - Red Hat OpenShift AI
- Red Hat OpenShift AI 2.16 registry.redhat.io/rhoai/odh-codeflare-operator-rhel8, registry.redhat.io/rhoai/odh-dashboard-rhel8, registry.redhat.io/rhoai/odh-data-science-pipelines-argo-argoexec-rhel8 +12
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Logging Subsystem for Red Hat OpenShift | Affected | No fix planned: Will not fix |
| Red Hat 3scale API Management Platform 2 | Affected | No fix planned: Will not fix |
| Red Hat Ansible Automation Platform 2 | Affected | No fix yet |
| Red Hat Data Grid 8 | Affected | No fix yet |
| Red Hat Fuse 7 | Affected | No fix planned: Will not fix |
| Red Hat Single Sign-On 7 | Affected | No fix yet |
| Red Hat build of Apicurio Registry 2 | Affected | No fix yet |
| streams for Apache Kafka 2 | Affected | No fix planned: Will not fix |
| streams for Apache Kafka 3 | Affected | No fix planned: Will not fix |
| Cluster Observability Operator 1.5 | Fixed | RHSA-2026:34342 |
| Red Hat Ceph Storage 9.2 | Fixed | RHSA-2026:86618 |
| Red Hat Developer Hub 1.8 | Fixed | RHSA-2026:9742 |
| Red Hat Developer Hub 1.9 | Fixed | RHSA-2026:13826 |
| Red Hat Edge Manager 1.0 | Fixed | RHSA-2026:36651 |
| Red Hat Edge Manager 1.1 | Fixed | RHSA-2026:40118, RHSA-2026:40945 |
| Red Hat OpenShift AI 2.16 | Fixed | RHSA-2026:5807 |
| Red Hat OpenShift Dev Spaces 3.28 | Fixed | RHSA-2026:21772 |
Not affected: 24 products
- Cluster Observability Operator 1.5
- Cryostat 4
- Red Hat 3scale API Management Platform 2
- Red Hat AMQ Broker 7
- Red Hat Ceph Storage 9.2
- Red Hat Developer Hub 1.8
- Red Hat Developer Hub 1.9
- Red Hat Directory Server 11
- Red Hat Directory Server 12
- Red Hat Directory Server 13
- Red Hat Edge Manager 1.0
- Red Hat Edge Manager 1.1
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat JBoss Enterprise Application Platform 7
- Red Hat JBoss Enterprise Application Platform 8
- Red Hat JBoss Enterprise Application Platform Expansion Pack
- Red Hat OpenShift AI (RHOAI)
- Red Hat OpenShift AI 2.16
- Red Hat OpenShift Container Platform 4
- Red Hat OpenShift Dev Spaces 3.28
- Red Hat Process Automation 7
- Red Hat Quay 3
- Red Hat build of OptaPlanner 8
Timeline
- 2026-10-02 Threatist record created from CVE-2026-32141
- 2026-10-03 Alias added: GHSA-25h7-pfq9-p65f
- 2026-10-21 Fix available: RHSA-2026:86618 · Red Hat
- 2026-10-21 Fix available: Red Hat Ceph Storage 9.2 · Red Hat
- 2026-11-05 Fix available: Cluster Observability Operator 1.5 · Red Hat
References
Patch 2
More WebReflection Flatted vulnerabilities
- TI-2026-25647 flatted: Prototype Pollution via parse() CVSS 4.0HIGH 8.9
Sources
- CVE-2026-32141 · CVE Program
- CVE-2026-32141 · NVD
- FIRST EPSS
- GHSA-25h7-pfq9-p65f · GitHub Advisory Database · CC BY 4.0
- CVE-2026-32141 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences