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CVE-2026-12143: form-data does not escape CR/LF/quote in multipart field names and filenames (CRLF injection)

High · CVSS 7.5 (CVSS 3.1)EPSS 0.67%, 52th percentilePublished Updated Assigner: harborist

Description

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.

Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N · CWE-93

Tracked companies

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Mapped from the CVE’s affected-product data, NVD CPE matches, vendor advisories or package feeds. A mapping means the vendor’s software is named, not that its hosted service was exposed.

Status incidents that name it

No tracked status incident names this CVE.

Affected vendors and products

Red Hat: Cryostat 4Red Hat: Migration Toolkit for Applications 8Red Hat: Network Observability OperatorRed Hat: OpenShift PipelinesRed Hat: OpenShift Service Mesh 3Red Hat: Red Hat 3scale API Management Platform 2Red Hat: Red Hat AMQ Broker 7.13.6Red Hat: Red Hat AMQ Broker 7.14.1Red Hat: Red Hat Ansible Automation Platform 2Red Hat: Red Hat Ansible Automation Platform 2.6 for RHEL 9Red Hat: Red Hat build of Apache Camel for Spring Boot 4Red Hat: Red Hat build of Apache Camel - HawtIO 4Red Hat: Red Hat build of Apicurio Registry 3Red Hat: Red Hat Build of Podman DesktopRed Hat: Red Hat Build of Podman Desktop - Tech PreviewRed Hat: Red Hat Data Grid 8.6.2Red Hat: Red Hat Discovery 2Red Hat: Red Hat Enterprise Linux AI (RHEL AI) 3Red Hat: Red Hat Fuse 7Red Hat: Red Hat Hardened ImagesRed Hat: Red Hat JBoss Enterprise Application Platform 7Red Hat: Red Hat JBoss Enterprise Application Platform 8Red Hat: Red Hat JBoss Enterprise Application Platform Expansion PackRed Hat: Red Hat OpenShift AI (RHOAI)Red Hat: Red Hat OpenShift Container Platform 4Red Hat: Red Hat OpenShift GitOpsRed Hat: Red Hat OpenShift Virtualization 4Red Hat: Red Hat Satellite 6

References

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