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CVE-2026-53537

Python-Multipart is a streaming multipart parser for Python. Prior to 0.0.30, parse_options_header parsed Content-Disposition (and Content-Type) headers with email.message.Message, which transparently applies RFC 2231/5987 decoding. The extended parameter syntax (filename*=charset'lang'value, name*=..., and the filename*0/filename*1 continuation form) is decoded and surfaced under the bare filename/name key, and overrides the plain parameter when both are present. RFC 7578 §4.2 explicitly forbid
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:dac4e74598cbf49b597612026df7a599b85e4ef121e810c93fdc975ea8782989
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-436","description":"CWE-436: Interpretation Conflict","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:671163c0dd2d04849c20061d4535a7c42a47eae73a94ebf756e77c0956280dec · sha256:bcf57ac941d6adb8… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-20","description":"CWE-20: Improper Input Validation","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:671163c0dd2d04849c20061d4535a7c42a47eae73a94ebf756e77c0956280dec · sha256:bcf57ac941d6adb8… · /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:v2:671163c0dd2d04849c20061d4535a7c42a47eae73a94ebf756e77c0956280dec · sha256:bcf57ac941d6adb8… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":3.7,"baseSeverity":"LOW","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:671163c0dd2d04849c20061d4535a7c42a47eae73a94ebf756e77c0956280dec · sha256:bcf57ac941d6adb8… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-436","description":"CWE-436: Interpretation Conflict","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:671163c0dd2d04849c20061d4535a7c42a47eae73a94ebf756e77c0956280dec · sha256:bcf57ac941d6adb8… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-20","description":"CWE-20: Improper Input Validation","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:671163c0dd2d04849c20061d4535a7c42a47eae73a94ebf756e77c0956280dec · sha256:bcf57ac941d6adb8… · /containers/cna/problemTypes/0/descriptions/0

Source references

1 source assertion
{"name":"https://github.com/Kludex/python-multipart/security/advisories/GHSA-vffw-93wf-4j4q","tags":["x_refsource_CONFIRM"],"url":"https://github.com/Kludex/python-multipart/security/advisories/GHSA-vffw-93wf-4j4q"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:671163c0dd2d04849c20061d4535a7c42a47eae73a94ebf756e77c0956280dec · sha256:bcf57ac941d6adb8… · /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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