CVE-2026-42561
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Kludex | python-multipart | < 0.0.27 | affected |
Weaknesses
- CWE-770: CWE-770: Allocation of Resources Without Limits or Throttling
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: yes
- Technical Impact: partial
python-multipart: python-multipart: Denial of Service via excessive multipart part headers
Additional References
- https://access.redhat.com/security/cve/CVE-2026-42561
- https://bugzilla.redhat.com/show_bug.cgi?id=2477309
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42561.json
References
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