CVE Explorer

CVE-2026-53539

Python-Multipart is a streaming multipart parser for Python. Prior to 0.0.30, when parsing application/x-www-form-urlencoded bodies, QuerystringParser located the field separator with a two step lookup: it first scanned the entire remaining buffer for &, and only when no & existed anywhere ahead did it fall back to scanning for ;. For a body that uses ; as the separator and contains no &, every field iteration performed a full failed & scan over the entire remaining buffer before locating the ne

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:ea9192b7d7756d8f6c531303f3152261dd97dc341de9c5032198f3ff07b674c3

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-407","description":"CWE-407: Inefficient Algorithmic Complexity","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:09bc8290b90b4f5697e24aae77023e143d924619850ce2108da199d765dd855c · sha256:159b4c88440b2120… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-400","description":"CWE-400: Uncontrolled Resource Consumption","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:09bc8290b90b4f5697e24aae77023e143d924619850ce2108da199d765dd855c · sha256:159b4c88440b2120… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion

{"product":"python-multipart","vendor":"Kludex","versions":[{"status":"affected","version":"< 0.0.30"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:09bc8290b90b4f5697e24aae77023e143d924619850ce2108da199d765dd855c · sha256:159b4c88440b2120… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion

{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:09bc8290b90b4f5697e24aae77023e143d924619850ce2108da199d765dd855c · sha256:159b4c88440b2120… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions

{"cweId":"CWE-407","description":"CWE-407: Inefficient Algorithmic Complexity","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:09bc8290b90b4f5697e24aae77023e143d924619850ce2108da199d765dd855c · sha256:159b4c88440b2120… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-400","description":"CWE-400: Uncontrolled Resource Consumption","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:09bc8290b90b4f5697e24aae77023e143d924619850ce2108da199d765dd855c · sha256:159b4c88440b2120… · /containers/cna/problemTypes/0/descriptions/0

Source references

1 source assertion

{"name":"https://github.com/Kludex/python-multipart/security/advisories/GHSA-5rvq-cxj2-64vf","tags":["x_refsource_CONFIRM"],"url":"https://github.com/Kludex/python-multipart/security/advisories/GHSA-5rvq-cxj2-64vf"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:09bc8290b90b4f5697e24aae77023e143d924619850ce2108da199d765dd855c · sha256:159b4c88440b2120… · /containers/cna/references/0

Attribution and limitations

CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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