CVE-2026-42561
Full vulnerability record from the local CVENow database.
Description
Python-Multipart is a streaming multipart parser for Python. Prior to 0.0.27, python-multipart has a denial of service vulnerability in multipart part header parsing. When parsing multipart/form-data, MultipartParser previously had no limit on the number of part headers or the size of an individual part header. An attacker could send a request with either many repeated headers without terminating the header block or a single very large header value, causing excessive CPU work before request rejection or completion. This vulnerability is fixed in 0.0.27.
Severity
HIGH
CVSS score
7.5
(v3.1)
Vulnerability status
Deferred
Source identifier
Published
2026-05-13 21:16:47.070000
Last modified
2026-10-26 14:10:00.130000
View original CVE JSON
{
"id": "CVE-2026-42561",
"sourceIdentifier": "[email protected]",
"published": "2026-05-13T21:16:47.070",
"lastModified": "2026-10-26T14:10:00.130",
"vulnStatus": "Deferred",
"cveTags": [],
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"value": "Python-Multipart is a streaming multipart parser for Python. Prior to 0.0.27, python-multipart has a denial of service vulnerability in multipart part header parsing. When parsing multipart/form-data, MultipartParser previously had no limit on the number of part headers or the size of an individual part header. An attacker could send a request with either many repeated headers without terminating the header block or a single very large header value, causing excessive CPU work before request rejection or completion. This vulnerability is fixed in 0.0.27."
},
{
"lang": "es",
"value": "Python-Multipart es un analizador multipart en streaming para Python. Antes de 0.0.27, python-multipart tiene una vulnerabilidad de denegación de servicio en el análisis de encabezados de partes multipart. Al analizar datos multipart/form-data, MultipartParser no tenía previamente un límite en el número de encabezados de parte o el tamaño de un encabezado de parte individual. Un atacante podría enviar una solicitud con muchos encabezados repetidos sin terminar el bloque de encabezados o un único valor de encabezado muy grande, causando un trabajo excesivo de la CPU antes del rechazo o la finalización de la solicitud. Esta vulnerabilidad está corregida en 0.0.27."
}
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{
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