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Fencer Vulns
medium 6.0

CVE-2025-15282 json

Header injection via newlines in data URL mediatype

published 2026-01-20 9 mo ago modified 2026-06-17 4 mo ago also BIT-libpython-2025-15282 , BIT-python-2025-15282 , BIT-python-min-2025-15282 , EUVD-2025-206305

cvss
6.0
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 45%
public exploits
0
none known

Summary

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

Patch / fix

  • bitnami libpython 3.10.20, 3.11.15, 3.12.13, 3.13.12, 3.14.3
  • bitnami python 3.10.20, 3.11.15, 3.12.13, 3.13.12, 3.14.3
  • bitnami python-min 3.10.20, 3.11.15, 3.12.13, 3.13.12, 3.14.3
  • Python Software Foundation CPython 3.10.20, 3.11.15, 3.12.13, 3.13.12, 3.14.3, 3.15.0a6
  • pypy3 Debian 14 7.3.21+dfsg-1
  • python3.11 Debian 12 3.11.2-6+deb12u7
  • python3.13 Debian 13 3.13.5-2+deb13u1
  • python3.14 Debian 14 3.14.3-1

debian advisories DEBIAN-CVE-2025-15282

  • python3.10 Ubuntu 22.04 LTS 3.10.12-1~22.04.14
  • python3.12 Ubuntu 24.04 LTS 3.12.3-1ubuntu0.11
  • python3.13 Ubuntu 25.10 3.13.7-1ubuntu0.3
  • python3.14 Ubuntu 25.10 3.14.0-1ubuntu0.2
  • python2.7 Ubuntu Pro 14.04 LTS 2.7.6-8ubuntu0.6+esm29
  • python2.7 Ubuntu Pro 16.04 LTS 2.7.12-1ubuntu0~16.04.18+esm19
  • python2.7 Ubuntu Pro 18.04 LTS 2.7.17-1~18.04ubuntu1.13+esm14
  • python2.7 Ubuntu Pro 22.04 LTS 2.7.18-13ubuntu1.5+esm8

ubuntu advisories UBUNTU-CVE-2025-15282

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • python3.12 RHEL 9 3.12.13-2.el9_8
  • python3.12-idle RHEL 9 3.12.13-2.el9_8
  • python3.12-libs RHEL 9 3.12.13-2.el9_8
  • python3.12-test RHEL 9 3.12.13-2.el9_8
  • python3.12-tkinter RHEL 9 3.12.13-2.el9_8
  • python3.12 RHEL 10.2 3.12.13-2.el10_2
  • python3 RHEL 10.2 3.12.13-2.el10_2
  • python3-idle RHEL 10.2 3.12.13-2.el10_2

red hat advisories RHSA-2026:19177RHSA-2026:19064RHSA-2026:10950RHSA-2026:8822RHSA-2026:8824RHSA-2026:7661

  • python311 SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +6 more 3.11.15-150400.9.80.1
  • python311-core SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +6 more 3.11.15-150400.9.80.1
  • python311-documentation SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +5 more 3.11.15-150400.9.80.1
  • python311 SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Python 3 15 SP7 +1 more 3.11.15-150600.3.53.1
  • python311-core SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Python 3 15 SP7 +2 more 3.11.15-150600.3.53.1
  • python311-documentation openSUSE Leap 15.6 3.11.15-150600.3.53.1
  • python311 Linux Micro 6.1 3.11.15-slfo.1.1_1.1
  • python311-core Linux Micro 6.1 3.11.15-slfo.1.1_1.1

suse advisories SUSE-SU-2026:1117-1SUSE-SU-2026:1349-1SUSE-SU-2026:20768-1SUSE-SU-2026:20796-1SUSE-SU-2026:20665-1SUSE-SU-2026:20710-1

  • python313 openSUSE Leap 16.0 3.13.12-160000.1.1
  • python313-core openSUSE Leap 16.0 3.13.12-160000.1.1
  • python313-nogil openSUSE Leap 16.0 3.13.12-160000.1.1
  • python313-documentation openSUSE Leap 16.0 3.13.12-160000.1.1
  • python313-nogil-nogil-core openSUSE Leap 16.0 3.13.12-160000.1.1
  • python311 openSUSE Tumbleweed 3.11.14-4.1
  • python312 openSUSE Tumbleweed 3.12.12-5.1
  • python313 openSUSE Tumbleweed 3.13.12-1.1

opensuse advisories openSUSE-SU-2026:20254-1openSUSE-SU-2026:10221-1openSUSE-SU-2026:10222-1openSUSE-SU-2026:10223-1openSUSE-SU-2026:10206-1openSUSE-SU-2026:10200-1

  • python3 AlmaLinux 10 3.12.13-2.el10_2
  • python3-idle AlmaLinux 10 3.12.13-2.el10_2
  • python3-libs AlmaLinux 10 3.12.13-2.el10_2
  • python3-test AlmaLinux 10 3.12.13-2.el10_2
  • python3-tkinter AlmaLinux 10 3.12.13-2.el10_2
  • python-unversioned-command AlmaLinux 10 3.12.13-2.el10_2
  • python3.12 AlmaLinux 9 3.12.13-2.el9_8
  • python3.12-idle AlmaLinux 9 3.12.13-2.el9_8

almalinux advisories ALSA-2026:19064ALSA-2026:19177ALSA-2026:10950

  • python3.12 Rocky Linux 10 3.12.13-2.el10_2
  • python3.12 Rocky Linux 9 3.12.13-2.el9_8
  • python3.12 Rocky Linux 8 3.12.13-2.el8_10

rocky linux advisories RLSA-2026:19064RLSA-2026:19177RLSA-2026:10950

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-15282 updated cvss 4.8

cpython: Header injection via newlines in data URL mediatype in Python

  • Red Hat Enterprise Linux 6 python, tkinter, python-libs, python-test, python-tools Red Hat Enterprise Linux 7 python, firefox, python3, tkinter, python-libs, python-test, +5 more Red Hat Enterprise Linux 8 numpy, scipy, PyYAML, firefox, python3, mod_wsgi, +84 more Red Hat Enterprise Linux 9 firefox, python3, python3.9, python3.11, python3.14, firefox-x11, +18 more Red Hat Enterprise Linux 10 firefox, python3.14 Red Hat Enterprise Linux AI (RHEL AI) 3 rhelai3/bootc-cuda-rhel9, rhelai3/bootc-aws-cuda-rhel9, rhelai3/bootc-gcp-cuda-rhel9, rhelai3/bootc-azure-cuda-rhel9
    affected: workaround, no fix available “Fix deferred”
  • Red Hat OpenShift AI (RHOAI) rhoai/odh-dashboard-rhel9
    under investigation
  • Red Hat Enterprise Linux AppStream (v. 8) python3.12 3.12.13-2.el8_10, python3.12-libs 3.12.13-2.el8_10, python3.12-tkinter 3.12.13-2.el8_10, python3.12-rpm-macros 3.12.13-2.el8_10
    fixed: vendor fix RHSA-2026:10950
  • Red Hat Enterprise Linux AppStream (v. 9) python3.12 3.12.13-2.el9_8, python3.12-libs 3.12.13-2.el9_8, python3.12-tkinter 3.12.13-2.el9_8
    fixed: vendor fix RHSA-2026:19177
  • Red Hat Enterprise Linux AppStream (v. 10) python3-tkinter 3.12.13-2.el10_2, python-unversioned-command 3.12.13-2.el10_2 Red Hat Enterprise Linux BaseOS (v. 10) python3 3.12.13-2.el10_2, python3.12 3.12.13-2.el10_2, python3-libs 3.12.13-2.el10_2
    fixed: vendor fix RHSA-2026:19064
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) python3.12 3.12.13-2.el9_8, python3.12-idle 3.12.13-2.el9_8, python3.12-test 3.12.13-2.el9_8, python3.12-tkinter 3.12.13-2.el9_8
    fixed: vendor fix RHSA-2026:19177
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) python3-idle 3.12.13-2.el10_2, python3-test 3.12.13-2.el10_2
    fixed: vendor fix RHSA-2026:19064
  • Red Hat Enterprise Linux CRB (v. 8) python3.12 3.12.13-2.el8_10, python3.12-idle 3.12.13-2.el8_10, python3.12-test 3.12.13-2.el8_10, python3.12-tkinter 3.12.13-2.el8_10
    fixed: vendor fix RHSA-2026:10950
show 3 more
  • Red Hat Hardened Images python3 3.14.4-1.hum1, python3.14 3.14.4-1.hum1, python3.11 3.11.15-4.hum1, python3.12 3.12.13-3.hum1, python3.13 3.13.13-1.hum1, python3-idle 3.14.4-1.hum1, +22 more
    fixed: vendor fix RHSA-2026:7661
  • Red Hat Update Infrastructure 5 rhui5/rhua-rhel9 1779798222, rhui5/rhua-tp-rhel9 1787241260, rhui5/installer-rhel9 1779798165, rhui5/installer-tp-rhel9 1787135742
    fixed: vendor fix RHSA-2026:21275
  • Red Hat Update Infrastructure 5 rhui5/cds-rhel9 1779798159, rhui5/cds-tp-rhel9 1787241206, rhui5/haproxy-rhel9 1779798164, rhui5/cds-kubernetes-tp-rhel9 1787241211
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
9 mo ago

Exploit prediction

0.54% chance of exploitation in the next 30 days, higher than 45% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 6.0 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
CNA 4.0 6.0 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

Affected packages

ecosystem package affected fixed in
bitnami libpython
<3.10.20
>=3.11.0, <3.11.15
>=3.12.0, <3.12.13
>=3.13.0, <3.13.12
>=3.14.0, <3.14.3
3.10.20
3.11.15
3.12.13
3.13.12
3.14.3
bitnami python
<3.10.20
>=3.11.0, <3.11.15
>=3.12.0, <3.12.13
>=3.13.0, <3.13.12
>=3.14.0, <3.14.3
3.10.20
3.11.15
3.12.13
3.13.12
3.14.3
bitnami python-min
<3.10.20
>=3.11.0, <3.11.15
>=3.12.0, <3.12.13
>=3.13.0, <3.13.12
>=3.14.0, <3.14.3
3.10.20
3.11.15
3.12.13
3.13.12
3.14.3

Affected products

  • Python Software Foundation CPython

Classification

Weakness
  • CWE-93 Improper Neutralization of CRLF Sequences

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.