CVE-2025-15282

Published: Jan 20, 2026Modified: Jun 17, 2026Deferred

6.0

Vector

CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:XShow less

Source: CNA (Secondary)

Description

User-controlled data URLs parsed by urllib.request.DataHandler allow injecting headers through newlines in the data URL mediatype.

Related CWEs

Improper Neutralization of CRLF Sequences ('CRLF Injection')

The product uses CRLF (carriage return line feeds) as a special element, e.g. to separate lines or records, but it does not neutralize or incorrectly neutralizes CRLF sequences from inputs.

References (9)

https://github.com/python/cpython/commit/05356b1cc153108aaf27f3b72ce438af4aa218c0

Source: cna@python.org

https://github.com/python/cpython/commit/34d76b00dabde81a793bd06dd8ecb057838c4b38

Source: cna@python.org

https://github.com/python/cpython/commit/3f396ca9d7bbe2a50ea6b8c9b27c0082884d9f80

Source: cna@python.org

https://github.com/python/cpython/commit/4ed11d3cd288e6b90196a15c5a825a45d318fe47

Source: cna@python.org

https://github.com/python/cpython/commit/a35ca3be5842505dab74dc0b90b89cde0405017a

Source: cna@python.org

https://github.com/python/cpython/commit/f25509e78e8be6ea73c811ac2b8c928c28841b9f

Source: cna@python.org

https://github.com/python/cpython/issues/143925

Source: cna@python.org

https://github.com/python/cpython/pull/143926

Source: cna@python.org

https://mail.python.org/archives/list/security-announce@python.org/thread/X66HL7SISGJT33J53OHXMZT4DFLMHVKF/

Source: cna@python.org

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