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Fencer Vulns
high 8.2

CVE-2026-11972 json

tarfile opened in streaming mode mishandles EOF

published 2026-06-23 4 mo ago modified 2026-10-25 14 d ago also BIT-libpython-2026-11972 , BIT-python-2026-11972 , BIT-python-min-2026-11972 , EUVD-2026-38630

cvss
8.2
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 54%
public exploits
0
none known

Summary

When using the "tarfile" module with a file opened in "streaming mode" (mode="r|") the tarfile module did not properly handle EOF, making archive parsing take exponentially longer.

Patch / fix

  • bitnami libpython 3.10.21, 3.11.16, 3.12.14, 3.13.15, 3.14.7
  • bitnami python 3.10.21, 3.11.16, 3.12.14, 3.13.15, 3.14.7
  • bitnami python-min 3.10.21, 3.11.16, 3.12.14, 3.13.15, 3.14.7
  • Python Software Foundation CPython 3.10.21, 3.11.16, 3.12.14, 3.13.15, 3.14.7, 3.15.0b4
  • pypy3 Debian 14 8.0.0+dfsg-1
  • python3.13 Debian 13 3.13.5-2+deb13u5
  • python3.14 Debian 14 3.14.7-1

debian advisories DEBIAN-CVE-2026-11972

  • python3.13 hummingbird 1 3.13.15-1.hum1
  • python3.13-idle hummingbird 1 3.13.15-1.hum1
  • python3.13-libs hummingbird 1 3.13.15-1.hum1
  • python3.13-test hummingbird 1 3.13.15-1.hum1
  • python3.13-tkinter hummingbird 1 3.13.15-1.hum1
  • python3.13-freethreading hummingbird 1 3.13.15-1.hum1
  • python3 hummingbird 1 3.14.7-1.hum1
  • python3.14 hummingbird 1 3.14.7-1.hum1

red hat advisories RHSA-2026:54554RHSA-2026:54534RHSA-2026:35812RHSA-2026:35813RHSA-2026:35806RHSA-2026:35807

  • python3 SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +11 more 3.6.15-150300.10.129.1
  • python3-core SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +12 more 3.6.15-150300.10.129.1
  • grafana Multi Linux Manager Tools SLE-15 12.4.10-150002.4.27.1
  • mgr-push Multi Linux Manager Tools SLE-15 5.2.5-150002.3.12.1
  • spacecmd Multi Linux Manager Tools SLE-15 5.2.10-150002.3.15.1
  • uyuni-tools Multi Linux Manager Tools SLE-Micro-5, Multi Linux Manager Tools SLE-15 5.2.17-150002.3.20.1
  • venv-salt-minion Multi Linux Manager Tools SLE-Micro-5, Multi Linux Manager Tools SLE-15 3006.0-150002.5.22.1
  • spacewalk-client-tools Multi Linux Manager Tools SLE-15 5.2.7-150002.3.12.1

suse advisories SUSE-SU-2026:4754-1SUSE-SU-2026:4585-1SUSE-SU-2026:4584-1SUSE-SU-2026:4583-1SUSE-SU-2026:4582-1SUSE-SU-2026:4581-1

  • python314 openSUSE Tumbleweed 3.14.7-1.1
  • python313 openSUSE Leap 16.0 3.13.14-160000.2.1
  • python313-core openSUSE Leap 16.0 3.13.14-160000.2.1
  • python313-nogil openSUSE Leap 16.0 3.13.14-160000.2.1
  • python313-documentation openSUSE Leap 16.0 3.13.14-160000.2.1
  • python313-nogil-nogil-core openSUSE Leap 16.0 3.13.14-160000.2.1
  • python313 openSUSE Tumbleweed 3.13.14-2.1
  • python310 openSUSE Tumbleweed 3.10.20-8.1

opensuse advisories openSUSE-SU-2026:11597-1openSUSE-SU-2026:21595-1openSUSE-SU-2026:11534-1openSUSE-SU-2026:11426-1openSUSE-SU-2026:11427-1openSUSE-SU-2026:11428-1

  • python3 Alpine 3.23, Alpine 3.22, Alpine 3.21 3.12.14-r0
  • python3 Alpine 3.24 3.14.7-r0

alpine advisories ALPINE-CVE-2026-11972

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • python3 Azure Linux 3.0 3.12.9-14

azure linux advisories AZL-91248

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

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-2026-11972 updated cvss 6.5

python: Python tarfile module: Denial of Service via improper EOF handling in streaming mode

  • Red Hat Exploit Intelligence exploit-intelligence-tech-preview/vulnerability-analysis-rhel9 Red Hat AI Inference Server rhaii/vllm-cpu-rhel9, rhaii/vllm-tpu-rhel9, rhaii/vllm-cuda-rhel9, rhaii/vllm-rocm-rhel9, rhaiis/vllm-cpu-rhel9, rhaiis/vllm-tpu-rhel9, +9 more Red Hat Enterprise Linux 6 python, tkinter, python-libs, python-test, python-tools Red Hat Enterprise Linux 7 python, python3, tkinter, python-libs, python-test, python-tools, +4 more Red Hat Enterprise Linux 8 scipy, python3, python36, python3.12, python-nose, python-wheel, +31 more Red Hat Enterprise Linux 9 python3, python3.9, python3.12, python3.14, python3-idle, python3-libs, +16 more
    +6 more products
    Red Hat Enterprise Linux 10 python3.12, python3.14 Red Hat Enterprise Linux AI (RHEL AI) 3 rhelai3/bootc-cuda-rhel9, rhelai3/bootc-rocm-rhel9, rhelai3/bootc-gaudi-rhel9, rhelai3/bootc-aws-cuda-rhel9, rhelai3/bootc-gcp-cuda-rhel9, rhelai3/bootc-azure-cuda-rhel9, +1 more Red Hat OpenShift AI (RHOAI) rhoai/odh-automl-rhel9, rhoai/odh-mlflow-rhel9, rhoai/odh-autorag-rhel9, rhoai/odh-mlserver-rhel9, rhai/base-image-cpu-rhel9, rhai/base-image-tpu-rhel9, +57 more Red Hat OpenShift Dev Spaces devspaces/code-rhel9 Red Hat OpenShift Virtualization 4 container-native-virtualization/ocp-virt-validation-checkup-rhel9 Red Hat Self-service automation portal 2 ansible-automation-platform/bootc-automation-portal-rhel9
    affected: workaround, no fix available “Avoid using tarfile streaming mode (mode='r|') with untrusted tar archives. Use the standard file-based mode (mode='r') instead where possible.”
  • Red Hat Hardened Images python3 3.14.7-1.hum1, python3.14 3.14.7-1.hum1, python3.13 3.13.15-1.hum1, python3-idle 3.14.7-1.hum1, python3-libs 3.14.7-1.hum1, python3-test 3.14.7-1.hum1, +38 more
    fixed: vendor fix “Avoid using tarfile streaming mode (mode='r|') with untrusted tar archives. Use the standard file-based mode (mode='r') instead where possible.” RHSA-2026:54534

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
4 mo ago

Exploit prediction

0.71% chance of exploitation in the next 30 days, higher than 54% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 8.2 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CNA 4.0 8.2 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/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
<3.10.21
>=3.11.0, <3.11.16
>=3.12.0, <3.12.14
>=3.13.0, <3.13.15
>=3.14.0, <3.14.7
3.10.21
3.11.16
3.12.14
3.13.15
3.14.7
bitnami python
<3.10.21
>=3.11.0, <3.11.16
>=3.12.0, <3.12.14
>=3.13.0, <3.13.15
>=3.14.0, <3.14.7
3.10.21
3.11.16
3.12.14
3.13.15
3.14.7
bitnami python-min
<3.10.21
>=3.11.0, <3.11.16
>=3.12.0, <3.12.14
>=3.13.0, <3.13.15
>=3.14.0, <3.14.7
3.10.21
3.11.16
3.12.14
3.13.15
3.14.7

Affected products

  • Python Software Foundation CPython

Classification

Weakness
  • CWE-252 Unchecked Return Value
  • CWE-606 Unchecked Input for Loop Condition
  • CWE-770 Allocation of Resources Without Limits or Throttling

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.