#36923: URLField.to_python() mangles mailto: URLs
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Reporter: waveywhite | Owner: Natalia
| Bidart
Type: Bug | Status: assigned
Component: Forms | Version: 5.2
Severity: Normal | Resolution:
Keywords: mailto urlfield | Triage Stage: Accepted
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Comment (by Natalia <124304+nessita@…>):
In [changeset:"b3e8ec8cc310489fe80174b14b11edb970d682ea" b3e8ec8c]:
{{{#!CommitTicketReference repository=""
revision="b3e8ec8cc310489fe80174b14b11edb970d682ea"
[4.2.x] Fixed CVE-2026-25673 -- Simplified URLField scheme detection.
This simplicaftion mitigates a potential DoS in URLField on Windows. The
usage of `urlsplit()` in `URLField.to_python()` was replaced with
`str.partition(":")` for URL scheme detection. On Windows, `urlsplit()`
performs Unicode normalization which is slow for certain characters,
making `URLField` vulnerable to DoS via specially crafted POST payloads.
Thanks Seokchan Yoon for the report, and Jake Howard and Shai Berger
for the review.
Refs #36923.
Co-authored-by: Jacob Walls <[email protected]>
Backport of 951ffb3832cd83ba672c1e3deae2bda128eb9cca from main.
}}}
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Ticket URL: <https://code.djangoproject.com/ticket/36923#comment:12>
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