> CVE-2026-12143 [HIGH]

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PUBLISHED
2026-06-12 19:16
MODIFIED
2026-06-12 19:16
CVSS_SCORE V3
8.7
EPSS (Prob. Exploit)
0.67%
Top 48.6%
DATA SOURCES:
NVD 🔗 2026-06-12 CWE MITRE 🔗 2026-11-01 FIRST EPSS 🔗 2026-10-25 MSRC 🔗 2026-11-02

> 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.

> AFFECTED_PRODUCTS

ℹ️ Aucun produit affecté n'a encore été publié par NVD pour cette CVE.

> CVSS V3 METRICS

CVSS_VECTOR
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

> MÉTRIQUES CVSS DÉTAILLÉES

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Métrique Valeur Interprétation
AV (Vecteur d'Attaque)
Attack Vector
Network (N)
Exploit possible à distance via réseau (HTTP, API, etc.)
AC (Complexité d'Attaque)
Attack Complexity
Low (L)
Peu de conditions requises pour exploiter
PR (Privilèges Requis)
Privileges Required
None (N)
Aucune authentification requise
UI (Interaction Utilisateur)
User Interaction
None (N)
Aucune interaction utilisateur nécessaire
S (Périmètre)
Scope
Unchanged (U)
Impact reste dans le périmètre du composant compromis
C (Impact Confidentialité)
Confidentiality Impact
None (N)
Aucune divulgation d'informations
I (Impact Intégrité)
Integrity Impact
High (H)
Modification totale des données possible
A (Impact Disponibilité)
Availability Impact
None (N)
Aucune interruption de service

> RÉSUMÉ DES IMPACTS

Confidentialité
None
Aucune divulgation d'informations
Intégrité
High
Modification totale des données possible
Disponibilité
None
Aucune interruption de service

> WEAKNESSES

CWE-93

> CWE DETAILED DESCRIPTIONS

CWE-93: Improper Neutralization of CRLF Sequences - The product uses CRLF (carriage return line feeds) as a special element, e.g. to separate lines or records, but it does not neutralize or incorrectly neutralizes CRLF sequences from inputs.

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> HISTORIQUE DES MODIFICATIONS

Première apparition
12/06/2026 19:16
Source: NVD
📊 ENRICHISSEMENT 01/11/2026 06:59
CWE
Champ modifié: Description CWE
Ancienne valeur:
CWE-93: Improper Neutralization of CRLF Sequences ('CRLF Injection') - The product uses CRLF (carriage return line feeds) as a special element, e.g. to separate lines or records, but it does not neutr...
Nouvelle valeur:
CWE-93: Improper Neutralization of CRLF Sequences - The product uses CRLF (carriage return line feeds) as a special element, e.g. to separate lines or records, but it does not neutralize or incorrectl...
📊 ENRICHISSEMENT 01/07/2026 06:01
CWE
Champ modifié: Description CWE
Ancienne valeur:
N/A
Nouvelle valeur:
CWE-93: Improper Neutralization of CRLF Sequences ('CRLF Injection') - The product uses CRLF (carriage return line feeds) as a special element, e.g. to separate lines or records, but it does not neutr...
Total des modifications: 2 Dernière mise à jour: 6 days ago

> REFERENCES

https://cwe.mitre.org/data/definitions/93.html
https://github.com/form-data/form-data/commit/64190db548c0179e37206858e39f27cf51...
https://github.com/form-data/form-data/commit/be3f3cf553978bac15a5182f1f3c3d2d38...
https://github.com/form-data/form-data/commit/c7133499c2ee1b80c678e411244f4442bf...
https://github.com/form-data/form-data/security/advisories/GHSA-hmw2-7cc7-3qxx
https://html.spec.whatwg.org/multipage/form-control-infrastructure.html#multipar...
https://www.npmjs.com/package/form-data
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