CVE-2026-42561High· 7.5▾ TwilightA flaw was found in python-multipart. A remote attacker can exploit this denial of service (DoS) vulnerability by sending a specially crafted request with an excessive number of part headers or a single very large header value during multi…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 41.3 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Jul 30.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CSAF
0.7%
0.7% → 0.8%
Last analysed / modified upstream
A flaw was found in python-multipart. A remote attacker can exploit this denial of service (DoS) vulnerability by sending a specially crafted request with an excessive number of part headers or a single very large header value during multipart/form-data parsing. This can lead to excessive CPU utilization, resulting in a denial of service for the affected system.
python-multipart: python-multipart: Denial of Service via excessive multipart part headers — rated Important by Red Hat. Released 2026-05-13, updated 2026-10-15.
Affected:
Fixed:
No fix planned:
Not affected:
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://docs.redhat.com/en/documentation/red_hat_ansible_automation_platform/2.6#Upgrade https://access.redhat.com/errata/RHSA-2026:42132 Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://docs.redhat.com/en/documentation/red_hat_ansible_automation_platform/2.7#Upgrade https://access.redhat.com/errata/RHSA-2026:42142 Before applying this update, make sure all previously released errata relevant to your system have been applied. https://access.redhat.com/errata/RHSA-2026:43038
Affected packages:
python-multipart < 0.0.27Patched in:
python-multipart 0.0.27Connected by shared product, vendor, weakness, or advisory.
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