Vulnerability Details CVE-2026-40347
Python-Multipart is a streaming multipart parser for Python. Versions prior to 0.0.26 have a denial of service vulnerability when parsing crafted `multipart/form-data` requests with large preamble or epilogue sections. Upgrade to version 0.0.26 or later, which skips ahead to the next boundary candidate when processing leading CR/LF data and immediately discards epilogue data after the closing boundary.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 5.1%
CVSS Severity
CVSS v3 Score 5.3
References
Products affected by CVE-2026-40347
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cpe:2.3:a:fastapiexpert:python-multipart:0.0.1
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cpe:2.3:a:fastapiexpert:python-multipart:0.0.10
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cpe:2.3:a:fastapiexpert:python-multipart:0.0.11
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cpe:2.3:a:fastapiexpert:python-multipart:0.0.12
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cpe:2.3:a:fastapiexpert:python-multipart:0.0.13
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cpe:2.3:a:fastapiexpert:python-multipart:0.0.14
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cpe:2.3:a:fastapiexpert:python-multipart:0.0.15
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cpe:2.3:a:fastapiexpert:python-multipart:0.0.16
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cpe:2.3:a:fastapiexpert:python-multipart:0.0.17
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cpe:2.3:a:fastapiexpert:python-multipart:0.0.18
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cpe:2.3:a:fastapiexpert:python-multipart:0.0.19
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cpe:2.3:a:fastapiexpert:python-multipart:0.0.2
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cpe:2.3:a:fastapiexpert:python-multipart:0.0.20
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cpe:2.3:a:fastapiexpert:python-multipart:0.0.21
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cpe:2.3:a:fastapiexpert:python-multipart:0.0.22
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cpe:2.3:a:fastapiexpert:python-multipart:0.0.23
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cpe:2.3:a:fastapiexpert:python-multipart:0.0.24
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cpe:2.3:a:fastapiexpert:python-multipart:0.0.25
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cpe:2.3:a:fastapiexpert:python-multipart:0.0.3
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cpe:2.3:a:fastapiexpert:python-multipart:0.0.4
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cpe:2.3:a:fastapiexpert:python-multipart:0.0.5
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cpe:2.3:a:fastapiexpert:python-multipart:0.0.6
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cpe:2.3:a:fastapiexpert:python-multipart:0.0.7
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cpe:2.3:a:fastapiexpert:python-multipart:0.0.8
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cpe:2.3:a:fastapiexpert:python-multipart:0.0.9