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Fencer Vulns
medium 4.3

CVE-2025-8291 json

ZIP64 End of Central Directory (EOCD) Locator record offset not checked

published 2025-10-07 13 mo ago modified 2026-10-08 31 d ago also BIT-libpython-2025-8291 , BIT-python-2025-8291 , BIT-python-min-2025-8291 , EUVD-2025-31917 , GHSA-hhv7-p4pg-wm6p

cvss
4.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 40%
public exploits
0
none known

Summary

The 'zipfile' module would not check the validity of the ZIP64 End of Central Directory (EOCD) Locator record offset value would not be used to locate the ZIP64 EOCD record, instead the ZIP64 EOCD record would be assumed to be the previous record in the ZIP archive. This could be abused to create ZIP archives that are handled differently by the 'zipfile' module compared to other ZIP implementations.

Remediation maintains this behavior, but checks that the offset specified in the ZIP64 EOCD Locator record matches the expected value.

Patch / fix

  • bitnami libpython 3.9.24, 3.10.19, 3.11.14, 3.12.12, 3.13.10, 3.14.1
  • bitnami python 3.9.24, 3.10.19, 3.11.14, 3.12.12, 3.13.10, 3.14.1
  • bitnami python-min 3.9.24, 3.10.19, 3.11.14, 3.12.12, 3.13.10, 3.14.1
  • Python Software Foundation CPython 3.9.24, 3.10.19, 3.11.14, 3.12.12, 3.13.10, 3.14.1
  • 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 3.14.0-3

debian advisories DEBIAN-CVE-2025-8291

  • python3.10 Ubuntu 22.04 LTS 3.10.12-1~22.04.12
  • python3.12 Ubuntu 24.04 LTS 3.12.3-1ubuntu0.9
  • python3.13 Ubuntu 25.10 3.13.7-1ubuntu0.1
  • python3.4 Ubuntu Pro 14.04 LTS 3.4.3-1ubuntu1~14.04.7+esm17
  • python3.5 Ubuntu Pro 14.04 LTS 3.5.2-2ubuntu0~16.04.4~14.04.1+esm8
  • python3.5 Ubuntu Pro 16.04 LTS 3.5.2-2ubuntu0~16.04.13+esm20
  • python3.6 Ubuntu Pro 18.04 LTS 3.6.9-1~18.04ubuntu1.13+esm7
  • python3.7 Ubuntu Pro 18.04 LTS 3.7.5-2ubuntu1~18.04.2+esm8

ubuntu advisories UBUNTU-CVE-2025-8291

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

  • python3.11 hummingbird 1 3.11.15-4.hum1
  • python3.11-idle hummingbird 1 3.11.15-4.hum1
  • python3.11-libs hummingbird 1 3.11.15-4.hum1
  • python3.11-test hummingbird 1 3.11.15-4.hum1
  • python3.11-tkinter hummingbird 1 3.11.15-4.hum1
  • python3.12 hummingbird 1 3.12.13-3.hum1
  • python3.12-idle hummingbird 1 3.12.13-3.hum1
  • python3.12-libs hummingbird 1 3.12.13-3.hum1

red hat advisories RHSA-2026:8822RHSA-2026:8824RHSA-2026:7661RHSA-2026:7443RHSA-2026:0354RHSA-2026:0355

  • python313 SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 3.13.11-160000.1.1
  • python313-core SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 3.13.11-160000.1.1
  • python313-documentation SLES for SAP applications 16.0, SLES 16.0 3.13.11-160000.1.1
  • python311 SLE Module for Public Cloud 15 SP4, SLE High Performance Computing 15 SP5-ESPOS, SLE High Performance Computing 15 SP4-ESPOS +6 more 3.11.14-150400.9.69.1
  • python311-core SLE Module for Public Cloud 15 SP4, SLE High Performance Computing 15 SP5-ESPOS, SLE High Performance Computing 15 SP4-ESPOS +6 more 3.11.14-150400.9.69.1
  • python311-documentation SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +5 more 3.11.14-150400.9.69.1
  • python SLE Module for Package Hub 15 SP7, SLE Module for Package Hub 15 SP6, openSUSE Leap 15.6 2.7.18-150000.89.1
  • python-base SLE Module for Package Hub 15 SP7, SLE Module for Package Hub 15 SP6, openSUSE Leap 15.6 2.7.18-150000.89.2

suse advisories SUSE-SU-2026:20125-1SUSE-SU-2026:20154-1SUSE-SU-2026:0133-1SUSE-SU-2025:4487-1SUSE-SU-2025:4398-1SUSE-SU-2025:4257-2

  • python313 openSUSE Leap 16.0 3.13.11-160000.1.1
  • python313-core openSUSE Leap 16.0 3.13.11-160000.1.1
  • python313-nogil openSUSE Leap 16.0 3.13.11-160000.1.1
  • python313-documentation openSUSE Leap 16.0 3.13.11-160000.1.1
  • python313-nogil-nogil-core openSUSE Leap 16.0 3.13.11-160000.1.1
  • python39 openSUSE Tumbleweed 3.9.24-2.1
  • python310 openSUSE Tumbleweed 3.10.19-2.1
  • python311 openSUSE Tumbleweed 3.11.14-2.1

opensuse advisories openSUSE-SU-2026:20081-1openSUSE-SU-2025:15792-1openSUSE-SU-2025:15768-1openSUSE-SU-2025:15760-1openSUSE-SU-2025:15750-1openSUSE-SU-2025:15748-1

  • python3.12 AlmaLinux 8 3.12.12-1.el8_10
  • python3.12-idle AlmaLinux 8 3.12.12-1.el8_10
  • python3.12-libs AlmaLinux 8 3.12.12-1.el8_10
  • python3.12-test AlmaLinux 8 3.12.12-1.el8_10
  • python3.12-tkinter AlmaLinux 8 3.12.12-1.el8_10
  • python3.12-rpm-macros AlmaLinux 8 3.12.12-1.el8_10
  • python-unversioned-command AlmaLinux 10 3.12.12-1.el10_1
  • python39 AlmaLinux 8 3.9.25-2.module_el8.10.0+4083+53cad1fb

almalinux advisories ALSA-2026:0123ALSA-2025:23940ALSA-2025:23530ALSA-2025:23323ALSA-2025:23342

  • python3.12 Rocky Linux 8 3.12.12-1.el8_10
  • python3.12 Rocky Linux 10 3.12.12-1.el10_1
  • python3.12 Rocky Linux 9 3.12.12-1.el9_7
  • python3.9 Rocky Linux 9 3.9.25-2.el9_7
  • numpy Rocky Linux 8 1.19.4-3.module+el8.10.0+1582+bc278001
  • numpy Rocky Linux 8 1.19.4-3.module+el8.10.0+1860+afcc1c71
  • scipy Rocky Linux 8 1.5.4-5.module+el8.10.0+1860+afcc1c71
  • scipy Rocky Linux 8 1.5.4-5.module+el8.10.0+1582+bc278001

rocky linux advisories RLSA-2026:0123RLSA-2025:23940RLSA-2025:23323RLSA-2025:23342RLSA-2025:23530

  • python3 Azure Linux 3.0 3.12.9-5
  • python3 CBL-Mariner 2.0 3.9.19-16

azure linux advisories AZL-68318AZL-68321

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-2025-8291 updated cvss 4.3

cpython: python: Python zipfile End of Central Directory (EOCD) Locator record offset not checked

  • 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
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 scipy, python3, python36, python3.11, python-nose, python-wheel, +31 more Red Hat Enterprise Linux 9 python3.11, python3.11-idle, python3.11-libs, python3.11-test, python3.11-tkinter Red Hat Enterprise Linux AI (RHEL AI) rhelai1/bootc-amd-rhel9, rhelai1/bootc-nvidia-rhel9, rhelai1/bootc-azure-amd-rhel9, rhelai1/bootc-aws-nvidia-rhel9, rhelai1/bootc-gcp-nvidia-rhel9, rhelai1/bootc-azure-nvidia-rhel9
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Ceph Storage 7 rhceph 1769508455
    fixed: vendor fix RHSA-2026:1858
  • Red Hat Ceph Storage 8 rhceph 1769512383
    fixed: vendor fix RHSA-2026:1652
  • Red Hat CodeReady Linux Builder EUS (v.9.4) python3.12 3.12.1-4.el9_4.8, python3.12-idle 3.12.1-4.el9_4.8, python3.12-test 3.12.1-4.el9_4.8, python3.12-tkinter 3.12.1-4.el9_4.8
    fixed: vendor fix RHSA-2026:0354
  • Red Hat CodeReady Linux Builder EUS (v.9.6) python3.12 3.12.9-1.el9_6.3, python3.12-idle 3.12.9-1.el9_6.3, python3.12-test 3.12.9-1.el9_6.3, python3.12-tkinter 3.12.9-1.el9_6.3
    fixed: vendor fix RHSA-2026:0355
  • Red Hat Discovery 2 discovery 1767888970, discovery 1767904573
    fixed: vendor fix RHSA-2026:0414
  • Red Hat Enterprise Linux AppStream (v. 8) python3.12 3.12.12-1.el8_10, python3.12-libs 3.12.12-1.el8_10, python3.12-tkinter 3.12.12-1.el8_10, python3.12-rpm-macros 3.12.12-1.el8_10, scipy 1.5.4-5.module+el8.9.0+19644+d68f775d, numpy 1.19.4-3.module+el8.9.0+19644+d68f775d, +53 more
    fixed: vendor fix RHSA-2025:23530
show 15 more
  • Red Hat Enterprise Linux AppStream (v. 9) python3.12 3.12.12-1.el9_7, python3-tkinter 3.9.25-2.el9_7, python3.12-libs 3.12.12-1.el9_7, python3.12-tkinter 3.12.12-1.el9_7, python-unversioned-command 3.9.25-2.el9_7
    fixed: vendor fix RHSA-2025:23342
  • Red Hat Enterprise Linux AppStream (v. 10) python3-tkinter 3.12.12-1.el10_1, python-unversioned-command 3.12.12-1.el10_1
    fixed: vendor fix RHSA-2025:23940
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) python3-tkinter 3.12.9-2.el10_0.4, python-unversioned-command 3.12.9-2.el10_0.4
    fixed: vendor fix RHSA-2026:0353
  • Red Hat Enterprise Linux AppStream EUS (v.9.4) python3.12 3.12.1-4.el9_4.8, python3.12-libs 3.12.1-4.el9_4.8, python3.12-tkinter 3.12.1-4.el9_4.8
    fixed: vendor fix RHSA-2026:0354
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) python3.12 3.12.9-1.el9_6.3, python3.12-libs 3.12.9-1.el9_6.3, python3.12-tkinter 3.12.9-1.el9_6.3
    fixed: vendor fix RHSA-2026:0355
  • Red Hat Enterprise Linux BaseOS (v. 9) python3 3.9.25-2.el9_7, python3.9 3.9.25-2.el9_7, python3-libs 3.9.25-2.el9_7
    fixed: vendor fix RHSA-2025:23342
  • Red Hat Enterprise Linux BaseOS (v. 10) python3 3.12.12-1.el10_1, python3.12 3.12.12-1.el10_1, python3-libs 3.12.12-1.el10_1
    fixed: vendor fix RHSA-2025:23940
  • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) python3 3.12.9-2.el10_0.4, python3.12 3.12.9-2.el10_0.4, python3-libs 3.12.9-2.el10_0.4
    fixed: vendor fix RHSA-2026:0353
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) python3 3.9.25-2.el9_7, python3.12 3.12.12-1.el9_7, python3-idle 3.9.25-2.el9_7, python3-test 3.9.25-2.el9_7, python3-tkinter 3.9.25-2.el9_7, python3.12-idle 3.12.12-1.el9_7, +2 more
    fixed: vendor fix RHSA-2025:23342
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) python3-idle 3.12.12-1.el10_1, python3-test 3.12.12-1.el10_1
    fixed: vendor fix RHSA-2025:23940
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) python3-idle 3.12.9-2.el10_0.4, python3-test 3.12.9-2.el10_0.4
    fixed: vendor fix RHSA-2026:0353
  • Red Hat Enterprise Linux CRB (v. 8) python3.12 3.12.12-1.el8_10, python3.12-idle 3.12.12-1.el8_10, python3.12-test 3.12.12-1.el8_10, python3.12-tkinter 3.12.12-1.el8_10, pytest 6.0.2-2.module+el8.9.0+19644+d68f775d, Cython 0.29.21-5.module+el8.9.0+19644+d68f775d, +20 more
    fixed: vendor fix RHSA-2025:23530
  • 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 1768221100, rhui5 1768221107, rhui5 1768296285, rhui5 1768377012
    fixed: vendor fix RHSA-2026:0685
  • Red Hat Ceph Storage 7 rhceph 1769511650, rhceph 1769512818, rhceph 1769513068, rhceph 1769514555, rhceph 1769523636 Red Hat Ceph Storage 8 rhceph 1768902743, rhceph 1768903190, rhceph 1768903749, rhceph 1768907469, rhceph 1768915405
    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
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
12 mo ago

Exploit prediction

0.47% chance of exploitation in the next 30 days, higher than 40% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/google/security-research/security/advisories/GHSA-hhv7-p4pg-wm6p referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
OSV 3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

Affected packages

ecosystem package affected fixed in
bitnami libpython
<3.9.24
>=3.10.0, <3.10.19
>=3.11.0, <3.11.14
>=3.12.0, <3.12.12
>=3.13.0, <3.13.10
>=3.14.0, <3.14.1
3.9.24
3.10.19
3.11.14
3.12.12
3.13.10
3.14.1
bitnami python
<3.9.24
>=3.10.0, <3.10.19
>=3.11.0, <3.11.14
>=3.12.0, <3.12.12
>=3.13.0, <3.13.10
>=3.14.0, <3.14.1
3.9.24
3.10.19
3.11.14
3.12.12
3.13.10
3.14.1
bitnami python-min
<3.9.24
>=3.10.0, <3.10.19
>=3.11.0, <3.11.14
>=3.12.0, <3.12.12
>=3.13.0, <3.13.10
>=3.14.0, <3.14.1
3.9.24
3.10.19
3.11.14
3.12.12
3.13.10
3.14.1

Affected products

  • Python Software Foundation CPython

Classification

Weakness
  • CWE-1285 Improper Validation of Specified Index, Position, or Offset in Input

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.