CVE-2026-28356 is a high-severity Regular Expression Denial of Service (ReDoS) vulnerability affecting the `multipart` Python library, specifically versions prior to 1.2.2, 1.3.1, and 1.4.0-dev. This flaw allows remote attackers to trigger exponential backtracking by sending maliciously crafted HTTP or multipart segment headers, leading to a denial of service for web applications utilizing the library. With a CVSS score of 7.5 (HIGH), the vulnerability is easily exploitable over the network without authentication, primarily impacting system availability. Currently, there is no evidence of active exploitation, public exploit code, or significant community discussion regarding this CVE.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
| Defnull | Multipart | < 1.2.2, >= 1.3.0, < 1.3.1CNA affected |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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