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.
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Affected Vendors & Products
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History
Thu, 14 May 2026 21:30:00 +0000
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ssvc
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Wed, 13 May 2026 22:45:00 +0000
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Kludex
Kludex python-multipart |
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Kludex
Kludex python-multipart |
Wed, 13 May 2026 21:15:00 +0000
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| 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. | |
| Title | Python-Multipart: Denial of Service via unbounded multipart part headers | |
| Weaknesses | CWE-770 | |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: GitHub_M
Published: 2026-05-13T20:55:11.767Z
Updated: 2026-05-14T19:52:12.815Z
Reserved: 2026-04-28T16:56:50.192Z
Link: CVE-2026-42561
Updated: 2026-05-14T16:04:40.895Z
Status : Deferred
Published: 2026-05-13T21:16:47.070
Modified: 2026-05-14T17:00:31.310
Link: CVE-2026-42561
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