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Vulnerabilities

Vulnerability · CVE-2025-15282

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

Published Jan 20, 2026 · catalog updated Mar 3, 2026 · Python Software Foundation CPython

Last checked Nov 6, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-15282. EPSS is 0.54%. Act only if a listed version of Python Software Foundation CPython is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Medium6.0
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.54%
Remediation
Version ranges on file
Affected products
vendor Python Software Foundation CPython 3.11.0 <3.11.15

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

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor Python Software Foundation CPython 3.11.0 <3.11.153.11.0 <3.11.15

How to fix CVE-2025-15282

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-15282. EPSS is 0.54%. Act only if a listed version of Python Software Foundation CPython is installed.

Which versions are affected?

Compare what you have installed with Python Software Foundation CPython 3.11.0 <3.11.15 3.11.0 <3.11.15. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.54%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Jan 20, 2026 · EUVD

    Detected

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

  2. Mar 3, 2026 · EUVD

    Updated

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

Sources

  • CVE.orgVulnerability recordCVE-2025-15282

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-15282

    30-day exploitation probability 0.54%

    first.org
  • EUVDVulnerability recordEUVD-2025-206305

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

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Nov 6, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSNov 6, 2026
  • CVE.orgNov 4, 2026
  • EUVDNov 2, 2026