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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.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:c93be8fe98126684ff130da63ed753f57bb0028ab8baedd94b8b271076a9441b
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-834","description":"CWE-834: Excessive Iteration","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:6050c3ca2e8135d209b18df4214165a38af1e752ae932db3289a9829b28ea4b9 · sha256:e106e5884bd08f38… · /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:v2:6050c3ca2e8135d209b18df4214165a38af1e752ae932db3289a9829b28ea4b9 · sha256:e106e5884bd08f38… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"product":"python-multipart","vendor":"Kludex","versions":[{"status":"affected","version":"< 0.0.26"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:6050c3ca2e8135d209b18df4214165a38af1e752ae932db3289a9829b28ea4b9 · sha256:e106e5884bd08f38… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":5.3,"baseSeverity":"MEDIUM","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:L","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:6050c3ca2e8135d209b18df4214165a38af1e752ae932db3289a9829b28ea4b9 · sha256:e106e5884bd08f38… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-834","description":"CWE-834: Excessive Iteration","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:6050c3ca2e8135d209b18df4214165a38af1e752ae932db3289a9829b28ea4b9 · sha256:e106e5884bd08f38… · /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:v2:6050c3ca2e8135d209b18df4214165a38af1e752ae932db3289a9829b28ea4b9 · sha256:e106e5884bd08f38… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"name":"https://github.com/Kludex/python-multipart/releases/tag/0.0.26","tags":["x_refsource_MISC"],"url":"https://github.com/Kludex/python-multipart/releases/tag/0.0.26"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6050c3ca2e8135d209b18df4214165a38af1e752ae932db3289a9829b28ea4b9 · sha256:e106e5884bd08f38… · /containers/cna/references/1
{"name":"https://github.com/Kludex/python-multipart/security/advisories/GHSA-mj87-hwqh-73pj","tags":["x_refsource_CONFIRM"],"url":"https://github.com/Kludex/python-multipart/security/advisories/GHSA-mj87-hwqh-73pj"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6050c3ca2e8135d209b18df4214165a38af1e752ae932db3289a9829b28ea4b9 · sha256:e106e5884bd08f38… · /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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