CVE-2026-12143

Fixed in a distro release EPSS <1%CVSS 7.5

form-data is a library for creating readable multipart/form-data streams. In versions through 4.0.5, the `field` argument to `FormData#append` and the `filename` option are concatenated verbatim into the `Content-Disposition` header without escaping carriage return (CR), line feed (LF), or double-quote (") characters. An application that passes attacker-controlled data as a field name or filename (for example, an API gateway that turns JSON object keys into multipart field names) allows the attacker to terminate the header line and inject additional headers, or to smuggle entire additional multipart parts, into the request the application forwards to a backend. This can let the attacker add or override form fields (e.g. set `is_admin=true`) seen by the downstream parser. This is an instance of CWE-93 (CRLF injection). The fix escapes CR, LF, and `"` as `%0D`, `%0A`, and `%22` in field names and filenames, matching the serialization browsers use per the WHATWG HTML multipart/form-data encoding algorithm. Exploitation requires the consuming application to use untrusted input as a field name or filename; applications that use only fixed/trusted field names are not affected. Fixed in 2.5.6, 3.0.5, and 4.0.6.

Published 2026-06-12 · CVE record · OSV

Products: form-data, Red Hat Cryostat 4 on RHEL 9, Red Hat AMQ Broker 7.13.6, Red Hat AMQ Broker 7.14.1, Red Hat Ansible Automation Platform 2.6 for RHEL 9, Red Hat Data Grid 8.6.2, Red Hat Enterprise Linux 10, Red Hat Cluster Observability Operator 1.5.0, Red Hat multicluster engine for Kubernetes 2.1, Red Hat multicluster engine for Kubernetes 2.11, Red Hat multicluster engine for Kubernetes 2.6, Red Hat multicluster engine for Kubernetes 2.8, Red Hat multicluster engine for Kubernetes 2.9, Red Hat Advanced Cluster Management for Kubernetes 2.11, Red Hat Advanced Cluster Management for Kubernetes 2.13, Red Hat Advanced Cluster Management for Kubernetes 2.14, Red Hat Advanced Cluster Management for Kubernetes 2.15, Red Hat Advanced Cluster Management for Kubernetes 2.16, Red Hat Advanced Cluster Security 4.9, Red Hat Advanced Cluster Security for Kubernetes 4.10, Red Hat Ansible Automation Platform 2.1, Red Hat Ansible Automation Platform 2.2, Red Hat Ansible Automation Platform 2.6, Red Hat Ansible Automation Platform 2.7, Red Hat Developer Hub 1.10, Red Hat Developer Hub 1.9, Red Hat Migration Toolkit 1.8, Red Hat Migration Toolkit for Applications 8.1, Red Hat OpenShift AI 3.4, Red Hat OpenShift Container Platform 4.19, Red Hat OpenShift Container Platform 4.20, Red Hat OpenShift Container Platform 4.21, Red Hat OpenShift Container Platform 4.22, Red Hat Openshift Data Foundation 4.18, Red Hat Openshift Data Foundation 4.19, Red Hat Openshift Data Foundation 4.20, Red Hat OpenShift Dev Spaces 3.29, Red Hat OpenShift Dev Spaces 3.30, Red Hat OpenShift Service Mesh 2.6, Red Hat OpenShift Service Mesh 3.0, Red Hat OpenShift Service Mesh 3.1, Red Hat OpenShift Service Mesh 3.2, Red Hat OpenShift Service Mesh 3.3, Red Hat Quay 3.10, Red Hat Quay 3.12, Red Hat Quay 3.15, Red Hat Quay 3.16, Red Hat Quay 3.9, Red Hat Satellite 6.18, Red Hat Satellite 6.19, Red Hat Cryostat 4, Red Hat Migration Toolkit for Applications 8, Red Hat Network Observability Operator, Red Hat Node HealthCheck Operator, Red Hat OpenShift Pipelines, Red Hat OpenShift Service Mesh 3, Red Hat 3scale API Management Platform 2, Red Hat Ansible Automation Platform 2, Red Hat build of Apache Camel for Spring Boot 4, Red Hat build of Apache Camel - HawtIO 4, Red Hat build of Apicurio Registry 3, Red Hat Build of Podman Desktop, Red Hat Build of Podman Desktop - Tech Preview, Red Hat Discovery 2, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat Enterprise Linux AI (RHEL AI) 3, Red Hat Fuse 7, Red Hat Hardened Images, 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 Container Platform 4, Red Hat OpenShift GitOps, Red Hat OpenShift Virtualization 4, Red Hat Satellite 6, Red Hat Trusted Artifact Signer, Red Hat Trusted Profile Analyzer

Fixed upstream

Distro releases