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Vulnerability Details CVE-2026-53540

Python-Multipart is a streaming multipart parser for Python. Prior to 0.0.31, parse_form() did not validate the Content-Length header before using it to bound its chunked read of the request body. A negative Content-Length turned the bounded read into a read-until-EOF, so the entire body was loaded into memory in a single read instead of in fixed-size chunks. This vulnerability is fixed in 0.0.31.

Exploit prediction scoring system (EPSS) score

EPSS Score 0.002

EPSS Ranking 12.1%

CVSS Severity

CVSS v3 Score 3.7

References

https://github.com/Kludex/python-multipart/security/advisories/GHSA-v9pg-7xvm-68hf

Products affected by CVE-2026-53540

Fastapiexpert » Python-Multipart » Version: 0.0.1

cpe:2.3:a:fastapiexpert:python-multipart:0.0.1
Fastapiexpert » Python-Multipart » Version: 0.0.10

cpe:2.3:a:fastapiexpert:python-multipart:0.0.10
Fastapiexpert » Python-Multipart » Version: 0.0.11

cpe:2.3:a:fastapiexpert:python-multipart:0.0.11
Fastapiexpert » Python-Multipart » Version: 0.0.12

cpe:2.3:a:fastapiexpert:python-multipart:0.0.12
Fastapiexpert » Python-Multipart » Version: 0.0.13

cpe:2.3:a:fastapiexpert:python-multipart:0.0.13
Fastapiexpert » Python-Multipart » Version: 0.0.14

cpe:2.3:a:fastapiexpert:python-multipart:0.0.14
Fastapiexpert » Python-Multipart » Version: 0.0.15

cpe:2.3:a:fastapiexpert:python-multipart:0.0.15
Fastapiexpert » Python-Multipart » Version: 0.0.16

cpe:2.3:a:fastapiexpert:python-multipart:0.0.16
Fastapiexpert » Python-Multipart » Version: 0.0.17

cpe:2.3:a:fastapiexpert:python-multipart:0.0.17
Fastapiexpert » Python-Multipart » Version: 0.0.18

cpe:2.3:a:fastapiexpert:python-multipart:0.0.18
Fastapiexpert » Python-Multipart » Version: 0.0.19

cpe:2.3:a:fastapiexpert:python-multipart:0.0.19
Fastapiexpert » Python-Multipart » Version: 0.0.2

cpe:2.3:a:fastapiexpert:python-multipart:0.0.2
Fastapiexpert » Python-Multipart » Version: 0.0.20

cpe:2.3:a:fastapiexpert:python-multipart:0.0.20
Fastapiexpert » Python-Multipart » Version: 0.0.21

cpe:2.3:a:fastapiexpert:python-multipart:0.0.21
Fastapiexpert » Python-Multipart » Version: 0.0.22

cpe:2.3:a:fastapiexpert:python-multipart:0.0.22
Fastapiexpert » Python-Multipart » Version: 0.0.23

cpe:2.3:a:fastapiexpert:python-multipart:0.0.23
Fastapiexpert » Python-Multipart » Version: 0.0.24

cpe:2.3:a:fastapiexpert:python-multipart:0.0.24
Fastapiexpert » Python-Multipart » Version: 0.0.25

cpe:2.3:a:fastapiexpert:python-multipart:0.0.25
Fastapiexpert » Python-Multipart » Version: 0.0.26

cpe:2.3:a:fastapiexpert:python-multipart:0.0.26
Fastapiexpert » Python-Multipart » Version: 0.0.27

cpe:2.3:a:fastapiexpert:python-multipart:0.0.27
Fastapiexpert » Python-Multipart » Version: 0.0.28

cpe:2.3:a:fastapiexpert:python-multipart:0.0.28
Fastapiexpert » Python-Multipart » Version: 0.0.29

cpe:2.3:a:fastapiexpert:python-multipart:0.0.29
Fastapiexpert » Python-Multipart » Version: 0.0.3

cpe:2.3:a:fastapiexpert:python-multipart:0.0.3
Fastapiexpert » Python-Multipart » Version: 0.0.30

cpe:2.3:a:fastapiexpert:python-multipart:0.0.30
Fastapiexpert » Python-Multipart » Version: 0.0.4

cpe:2.3:a:fastapiexpert:python-multipart:0.0.4
Fastapiexpert » Python-Multipart » Version: 0.0.5

cpe:2.3:a:fastapiexpert:python-multipart:0.0.5
Fastapiexpert » Python-Multipart » Version: 0.0.6

cpe:2.3:a:fastapiexpert:python-multipart:0.0.6
Fastapiexpert » Python-Multipart » Version: 0.0.7

cpe:2.3:a:fastapiexpert:python-multipart:0.0.7
Fastapiexpert » Python-Multipart » Version: 0.0.8

cpe:2.3:a:fastapiexpert:python-multipart:0.0.8
Fastapiexpert » Python-Multipart » Version: 0.0.9

cpe:2.3:a:fastapiexpert:python-multipart:0.0.9

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Vulnerable Software

Vulnerability Details CVE-2026-53540

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