CVE-2026-42561 (GCVE-0-2026-42561)

Vulnerability from cvelistv5 – Published: 2026-05-13 20:55 – Updated: 2026-07-22 12:08
VLAI
Title
Python-Multipart: Denial of Service via unbounded multipart part headers
Summary
Python-Multipart is a streaming multipart parser for Python. Prior to 0.0.27, python-multipart has a denial of service vulnerability in multipart part header parsing. When parsing multipart/form-data, MultipartParser previously had no limit on the number of part headers or the size of an individual part header. An attacker could send a request with either many repeated headers without terminating the header block or a single very large header value, causing excessive CPU work before request rejection or completion. This vulnerability is fixed in 0.0.27.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-770 - Allocation of Resources Without Limits or Throttling
  • CWE-606 - Unchecked Input for Loop Condition
Assigner
References
Impacted products
Vendor Product Version
Kludex python-multipart Affected: < 0.0.27
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Red Hat Red Hat Ansible Automation Platform 2.6 Unaffected: 1783832856 , < * (rpm)
    cpe:/a:redhat:ansible_automation_platform:2.6::el9
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Red Hat Red Hat Ansible Automation Platform 2.6 Unaffected: 1783920640 , < * (rpm)
    cpe:/a:redhat:ansible_automation_platform:2.6::el9
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Red Hat Red Hat Ansible Automation Platform 2.7 Unaffected: 1783923914 , < * (rpm)
    cpe:/a:redhat:ansible_automation_platform:2.7::el9
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Red Hat Red Hat Ansible Automation Platform 2.7 Unaffected: 1783918403 , < * (rpm)
    cpe:/a:redhat:ansible_automation_platform:2.7::el9
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Red Hat Red Hat Migration Toolkit for Applications 8.2 Unaffected: 1784109883 , < * (rpm)
    cpe:/a:redhat:migration_toolkit_applications:8.2::el9
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Red Hat Red Hat OpenShift AI 3.3 Unaffected: 1782887848 , < * (rpm)
    cpe:/a:redhat:openshift_ai:3.3::el9
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Red Hat Exploit Intelligence     cpe:/a:redhat:exploit_intelligence:0
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Red Hat OpenShift Lightspeed     cpe:/a:redhat:openshift_lightspeed
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Red Hat Red Hat AI Inference Server     cpe:/a:redhat:ai_inference_server:3
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Red Hat Red Hat Ansible Automation Platform 2     cpe:/a:redhat:ansible_automation_platform:2
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Red Hat Red Hat Enterprise Linux AI (RHEL AI) 3     cpe:/a:redhat:enterprise_linux_ai:3
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Red Hat Red Hat OpenShift AI (RHOAI)     cpe:/a:redhat:openshift_ai
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Red Hat Red Hat Satellite 6     cpe:/a:redhat:satellite:6
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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.