CVE-2025-15282: Header injection via newlines in data URL mediatype | LiveThreat CVE Feed — Verisq

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Medium severity · published Jan 20, 2026

CVE-2025-15282

Header injection via newlines in data URL mediatype

6.0

CVSS

0.5%

EPSS

No

On KEV

Description

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

Exploitation

Is it being used?

Exploit prediction (EPSS)0.5% · higher than 45% of CVEs

Exploited in the wildNo evidence yet

CISA KEVNot listed

Ransomware campaign useNot known

Affected products

Which versions

CP

CPython · Python Software Foundation

before 3.10.20; 3.11.0 before 3.11.15; 3.12.0 before 3.12.13; 3.13.0 before 3.13.12; 3.14.0 before 3.14.3; 3.15.0a1 before 3.15.0a6 · source: vendor

Affected product

CP

CPython

Python Software Foundation

All CPython CVEs

References

https://nvd.nist.gov/vuln/detail/CVE-2025-15282

https://www.cve.org/CVERecord?id=CVE-2025-15282

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

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

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

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

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

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

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