Vulnerability · Published Oct 7, 2025 · Assigned by PSF

CVE-2025-8291ZIP64 End of Central Directory (EOCD) Locator record offset not checked

Medium 4.3

In plain English

A medium-severity security flaw in CPython from Python Software Foundation. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 41% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)4.3Medium
Exploit odds (30 days)0.5%top 59.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:10python-unversioned-command3.12.12-1.el10_1ALSA-2025:23940
AlmaLinux:9python-unversioned-command3.9.25-2.el9_7ALSA-2025:23342
AlmaLinux:9python33.9.25-2.el9_7ALSA-2025:23342
AlmaLinux:9python3-debug3.9.25-2.el9_7ALSA-2025:23342
AlmaLinux:9python3-devel3.9.25-2.el9_7ALSA-2025:23342
AlmaLinux:9python3-idle3.9.25-2.el9_7ALSA-2025:23342
AlmaLinux:9python3-libs3.9.25-2.el9_7ALSA-2025:23342
AlmaLinux:9python3-test3.9.25-2.el9_7ALSA-2025:23342
AlmaLinux:9python3-tkinter3.9.25-2.el9_7ALSA-2025:23342
AlmaLinux:8python3.123.12.12-1.el8_10ALSA-2026:0123
AlmaLinux:9python3.123.12.12-1.el9_7ALSA-2025:23323
AlmaLinux:8python3.12-debug3.12.12-1.el8_10ALSA-2026:0123
AlmaLinux:9python3.12-debug3.12.12-1.el9_7ALSA-2025:23323
AlmaLinux:8python3.12-devel3.12.12-1.el8_10ALSA-2026:0123
AlmaLinux:9python3.12-devel3.12.12-1.el9_7ALSA-2025:23323
AlmaLinux:8python3.12-idle3.12.12-1.el8_10ALSA-2026:0123
AlmaLinux:9python3.12-idle3.12.12-1.el9_7ALSA-2025:23323
AlmaLinux:8python3.12-libs3.12.12-1.el8_10ALSA-2026:0123
AlmaLinux:9python3.12-libs3.12.12-1.el9_7ALSA-2025:23323
AlmaLinux:8python3.12-rpm-macros3.12.12-1.el8_10ALSA-2026:0123
AlmaLinux:8python3.12-test3.12.12-1.el8_10ALSA-2026:0123
AlmaLinux:9python3.12-test3.12.12-1.el9_7ALSA-2025:23323
AlmaLinux:8python3.12-tkinter3.12.12-1.el8_10ALSA-2026:0123
AlmaLinux:9python3.12-tkinter3.12.12-1.el9_7ALSA-2025:23323
AlmaLinux:8python393.9.25-2.module_el8.10.0+4083+53cad1fbALSA-2025:23530
AlmaLinux:8python39-Cython0.29.21-5.module_el8.6.0+2780+a40f65e1ALSA-2025:23530
AlmaLinux:8python39-Cython0.29.21-5.module_el8.6.0+3248+c431e88cALSA-2025:23530
AlmaLinux:8python39-PyMySQL0.10.1-2.module_el8.6.0+2780+a40f65e1ALSA-2025:23530
AlmaLinux:8python39-attrs20.3.0-2.module_el8.6.0+2780+a40f65e1ALSA-2025:23530
AlmaLinux:8python39-cffi1.14.3-2.module_el8.6.0+3248+c431e88cALSA-2025:23530
AlmaLinux:8python39-cffi1.14.3-2.module_el8.6.0+2780+a40f65e1ALSA-2025:23530
AlmaLinux:8python39-chardet3.0.4-19.module_el8.6.0+2780+a40f65e1ALSA-2025:23530
AlmaLinux:8python39-cryptography3.3.1-3.module_el8.10.0+3765+2f9a457dALSA-2025:23530
AlmaLinux:8python39-debug3.9.25-2.module_el8.10.0+4083+53cad1fbALSA-2025:23530
AlmaLinux:8python39-devel3.9.25-2.module_el8.10.0+4083+53cad1fbALSA-2025:23530
AlmaLinux:8python39-idle3.9.25-2.module_el8.10.0+4083+53cad1fbALSA-2025:23530
AlmaLinux:8python39-idna2.10-4.module_el8.10.0+3849+a48d89aaALSA-2025:23530
AlmaLinux:8python39-iniconfig1.1.1-2.module_el8.6.0+2780+a40f65e1ALSA-2025:23530
AlmaLinux:8python39-libs3.9.25-2.module_el8.10.0+4083+53cad1fbALSA-2025:23530
AlmaLinux:8python39-lxml4.6.5-1.module_el8.6.0+3248+c431e88cALSA-2025:23530
AlmaLinux:8python39-lxml4.6.5-1.module_el8.6.0+2780+a40f65e1ALSA-2025:23530
AlmaLinux:8python39-mod_wsgi4.7.1-7.module_el8.10.0+3989+a618fe15.1ALSA-2025:23530
AlmaLinux:8python39-more-itertools8.5.0-2.module_el8.6.0+2780+a40f65e1ALSA-2025:23530
AlmaLinux:8python39-numpy1.19.4-3.module_el8.6.0+3248+c431e88cALSA-2025:23530
AlmaLinux:8python39-numpy1.19.4-3.module_el8.6.0+2780+a40f65e1ALSA-2025:23530
AlmaLinux:8python39-numpy-doc1.19.4-3.module_el8.6.0+2780+a40f65e1ALSA-2025:23530
AlmaLinux:8python39-numpy-f2py1.19.4-3.module_el8.6.0+3248+c431e88cALSA-2025:23530
AlmaLinux:8python39-numpy-f2py1.19.4-3.module_el8.6.0+2780+a40f65e1ALSA-2025:23530
AlmaLinux:8python39-packaging20.4-4.module_el8.6.0+2780+a40f65e1ALSA-2025:23530
AlmaLinux:8python39-pip20.2.4-9.module_el8.10.0+3765+2f9a457dALSA-2025:23530
AlmaLinux:8python39-pip-wheel20.2.4-9.module_el8.10.0+3765+2f9a457dALSA-2025:23530
AlmaLinux:8python39-pluggy0.13.1-3.module_el8.6.0+2780+a40f65e1ALSA-2025:23530
AlmaLinux:8python39-ply3.11-10.module_el8.6.0+2780+a40f65e1ALSA-2025:23530
AlmaLinux:8python39-psutil5.8.0-4.module_el8.6.0+3248+c431e88cALSA-2025:23530
AlmaLinux:8python39-psutil5.8.0-4.module_el8.6.0+2780+a40f65e1ALSA-2025:23530
AlmaLinux:8python39-psycopg22.8.6-3.module_el8.10.0+3765+2f9a457dALSA-2025:23530
AlmaLinux:8python39-psycopg2-doc2.8.6-3.module_el8.10.0+3765+2f9a457dALSA-2025:23530
AlmaLinux:8python39-psycopg2-tests2.8.6-3.module_el8.10.0+3765+2f9a457dALSA-2025:23530
AlmaLinux:8python39-py1.10.0-1.module_el8.6.0+2780+a40f65e1ALSA-2025:23530
AlmaLinux:8python39-pybind112.7.1-1.module_el8.6.0+2780+a40f65e1ALSA-2025:23530
AlmaLinux:8python39-pybind112.7.1-1.module_el8.6.0+3248+c431e88cALSA-2025:23530
AlmaLinux:8python39-pybind11-devel2.7.1-1.module_el8.6.0+2780+a40f65e1ALSA-2025:23530
AlmaLinux:8python39-pybind11-devel2.7.1-1.module_el8.6.0+3248+c431e88cALSA-2025:23530
AlmaLinux:8python39-pycparser2.20-3.module_el8.6.0+2780+a40f65e1ALSA-2025:23530
AlmaLinux:8python39-pyparsing2.4.7-5.module_el8.6.0+2780+a40f65e1ALSA-2025:23530
AlmaLinux:8python39-pysocks1.7.1-4.module_el8.6.0+2780+a40f65e1ALSA-2025:23530
AlmaLinux:8python39-pytest6.0.2-2.module_el8.6.0+2780+a40f65e1ALSA-2025:23530
AlmaLinux:8python39-pyyaml5.4.1-1.module_el8.6.0+2780+a40f65e1ALSA-2025:23530
AlmaLinux:8python39-pyyaml5.4.1-1.module_el8.6.0+3248+c431e88cALSA-2025:23530
AlmaLinux:8python39-requests2.25.0-3.module_el8.9.0+3634+fb2a896cALSA-2025:23530
AlmaLinux:8python39-rpm-macros3.9.25-2.module_el8.10.0+4083+53cad1fbALSA-2025:23530
AlmaLinux:8python39-scipy1.5.4-5.module_el8.9.0+3634+fb2a896cALSA-2025:23530
AlmaLinux:8python39-setuptools50.3.2-7.module_el8.10.0+4040+9207bbc0ALSA-2025:23530
AlmaLinux:8python39-setuptools-wheel50.3.2-7.module_el8.10.0+4040+9207bbc0ALSA-2025:23530
AlmaLinux:8python39-six1.15.0-3.module_el8.6.0+2780+a40f65e1ALSA-2025:23530
AlmaLinux:8python39-test3.9.25-2.module_el8.10.0+4083+53cad1fbALSA-2025:23530
AlmaLinux:8python39-tkinter3.9.25-2.module_el8.10.0+4083+53cad1fbALSA-2025:23530
AlmaLinux:8python39-toml0.10.1-5.module_el8.6.0+2780+a40f65e1ALSA-2025:23530
AlmaLinux:8python39-urllib31.25.10-5.module_el8.10.0+3765+2f9a457dALSA-2025:23530
AlmaLinux:8python39-wcwidth0.2.5-3.module_el8.6.0+2780+a40f65e1ALSA-2025:23530
AlmaLinux:8python39-wheel1:0.35.1-4.module_el8.6.0+2780+a40f65e1ALSA-2025:23530
AlmaLinux:8python39-wheel-wheel1:0.35.1-4.module_el8.6.0+2780+a40f65e1ALSA-2025:23530
Debian:12jythonno fix listedDEBIAN-CVE-2025-8291
Debian:13jythonno fix listedDEBIAN-CVE-2025-8291
Debian:14jythonno fix listedDEBIAN-CVE-2025-8291
Debian:12pypy3no fix listedDEBIAN-CVE-2025-8291
Debian:13pypy3no fix listedDEBIAN-CVE-2025-8291
Debian:14pypy37.3.21+dfsg-1DEBIAN-CVE-2025-8291
Debian:12python3.113.11.2-6+deb12u7DEBIAN-CVE-2025-8291
Debian:13python3.133.13.5-2+deb13u1DEBIAN-CVE-2025-8291
Debian:14python3.143.14.0-3DEBIAN-CVE-2025-8291
Rocky Linux:8Cython0:0.29.21-5.module+el8.10.0+1860+afcc1c71RLSA-2025:23530
Rocky Linux:8Cython0:0.29.21-5.module+el8.10.0+1582+bc278001RLSA-2025:23530
Rocky Linux:8PyYAML0:5.4.1-1.module+el8.10.0+1860+afcc1c71RLSA-2025:23530
Rocky Linux:8PyYAML0:5.4.1-1.module+el8.9.0+1418+f0d66789RLSA-2025:23530
Rocky Linux:8PyYAML0:5.4.1-1.module+el8.10.0+1582+bc278001RLSA-2025:23530
Rocky Linux:8mod_wsgi0:4.7.1-7.module+el8.10.0+1978+d4f111ba.1RLSA-2025:23530
Rocky Linux:8mod_wsgi0:4.7.1-7.module+el8.10.0+1582+bc278001RLSA-2025:23530
Rocky Linux:8mod_wsgi0:4.7.1-7.module+el8.10.0+1860+afcc1c71RLSA-2025:23530
Rocky Linux:8numpy0:1.19.4-3.module+el8.10.0+1582+bc278001RLSA-2025:23530
Rocky Linux:8numpy0:1.19.4-3.module+el8.10.0+1860+afcc1c71RLSA-2025:23530
Rocky Linux:8pybind110:2.7.1-1.module+el8.9.0+1357+a3b80af7RLSA-2025:23530
Rocky Linux:8pytest0:6.0.2-2.module+el8.10.0+1860+afcc1c71RLSA-2025:23530
Rocky Linux:8pytest0:6.0.2-2.module+el8.10.0+1582+bc278001RLSA-2025:23530
Rocky Linux:8python-PyMySQL0:0.10.1-2.module+el8.10.0+1860+afcc1c71RLSA-2025:23530
Rocky Linux:8python-PyMySQL0:0.10.1-2.module+el8.10.0+1582+bc278001RLSA-2025:23530
Rocky Linux:8python-PyMySQL0:0.10.1-2.module+el8.10.0+1910+234ad790RLSA-2025:23530
Rocky Linux:8python-PyMySQL0:0.10.1-2.module+el8.10.0+1592+61442852RLSA-2025:23530
Rocky Linux:8python-attrs0:20.3.0-2.module+el8.10.0+1582+bc278001RLSA-2025:23530
Rocky Linux:8python-attrs0:20.3.0-2.module+el8.10.0+1860+afcc1c71RLSA-2025:23530
Rocky Linux:8python-cffi0:1.14.3-2.module+el8.10.0+1860+afcc1c71RLSA-2025:23530
Rocky Linux:8python-cffi0:1.14.3-2.module+el8.10.0+1582+bc278001RLSA-2025:23530
Rocky Linux:8python-chardet0:3.0.4-19.module+el8.10.0+1582+bc278001RLSA-2025:23530
Rocky Linux:8python-chardet0:3.0.4-19.module+el8.10.0+1860+afcc1c71RLSA-2025:23530
Rocky Linux:8python-chardet0:3.0.4-19.module+el8.9.0+1418+f0d66789RLSA-2025:23530
Rocky Linux:8python-cryptography0:3.3.1-3.module+el8.10.0+1697+7e517775RLSA-2025:23530
Rocky Linux:8python-cryptography0:3.3.1-3.module+el8.10.0+1860+afcc1c71RLSA-2025:23530
Rocky Linux:8python-idna0:2.10-4.module+el8.10.0+1809+41195054RLSA-2025:23530
Rocky Linux:8python-idna0:2.10-4.module+el8.10.0+1860+afcc1c71RLSA-2025:23530
Rocky Linux:8python-iniconfig0:1.1.1-2.module+el8.9.0+1332+dd574197RLSA-2025:23530
Rocky Linux:8python-lxml0:4.6.5-1.module+el8.10.0+1582+bc278001RLSA-2025:23530
Rocky Linux:8python-more-itertools0:8.5.0-2.module+el8.10.0+1860+afcc1c71RLSA-2025:23530
Rocky Linux:8python-more-itertools0:8.5.0-2.module+el8.10.0+1582+bc278001RLSA-2025:23530
Rocky Linux:8python-packaging0:20.4-4.module+el8.10.0+1582+bc278001RLSA-2025:23530
Rocky Linux:8python-packaging0:20.4-4.module+el8.10.0+1860+afcc1c71RLSA-2025:23530
Rocky Linux:8python-pluggy0:0.13.1-3.module+el8.10.0+1582+bc278001RLSA-2025:23530
Rocky Linux:8python-pluggy0:0.13.1-3.module+el8.10.0+1860+afcc1c71RLSA-2025:23530
Rocky Linux:8python-ply0:3.11-10.module+el8.10.0+1860+afcc1c71RLSA-2025:23530
Rocky Linux:8python-ply0:3.11-10.module+el8.9.0+1418+f0d66789RLSA-2025:23530
Rocky Linux:8python-ply0:3.11-10.module+el8.10.0+1582+bc278001RLSA-2025:23530
Rocky Linux:8python-psutil0:5.8.0-4.module+el8.9.0+1357+a3b80af7RLSA-2025:23530
Rocky Linux:8python-psycopg20:2.8.6-3.module+el8.10.0+1660+b5b6f004RLSA-2025:23530
Rocky Linux:8python-psycopg20:2.8.6-3.module+el8.10.0+1860+afcc1c71RLSA-2025:23530
Rocky Linux:8python-py0:1.10.0-1.module+el8.10.0+1582+bc278001RLSA-2025:23530
Rocky Linux:8python-py0:1.10.0-1.module+el8.10.0+1860+afcc1c71RLSA-2025:23530
Rocky Linux:8python-pycparser0:2.20-3.module+el8.10.0+1860+afcc1c71RLSA-2025:23530
Rocky Linux:8python-pycparser0:2.20-3.module+el8.10.0+1582+bc278001RLSA-2025:23530
Rocky Linux:8python-pysocks0:1.7.1-4.module+el8.9.0+1418+f0d66789RLSA-2025:23530
Rocky Linux:8python-pysocks0:1.7.1-4.module+el8.10.0+1582+bc278001RLSA-2025:23530
Rocky Linux:8python-pysocks0:1.7.1-4.module+el8.10.0+1860+afcc1c71RLSA-2025:23530
Rocky Linux:8python-requests0:2.25.0-3.module+el8.10.0+1860+afcc1c71RLSA-2025:23530
Rocky Linux:8python-requests0:2.25.0-3.module+el8.10.0+1582+bc278001RLSA-2025:23530
Rocky Linux:8python-toml0:0.10.1-5.module+el8.9.0+1332+dd574197RLSA-2025:23530
Rocky Linux:8python-urllib30:1.25.10-5.module+el8.10.0+1860+afcc1c71RLSA-2025:23530
Rocky Linux:8python-urllib30:1.25.10-5.module+el8.10.0+1545+03246da9RLSA-2025:23530
Rocky Linux:8python-wcwidth0:0.2.5-3.module+el8.10.0+1860+afcc1c71RLSA-2025:23530
Rocky Linux:8python-wcwidth0:0.2.5-3.module+el8.10.0+1582+bc278001RLSA-2025:23530
Rocky Linux:8python-wheel1:0.35.1-4.module+el8.10.0+1582+bc278001RLSA-2025:23530
Rocky Linux:8python-wheel1:0.35.1-4.module+el8.10.0+1860+afcc1c71RLSA-2025:23530
Rocky Linux:10python3.120:3.12.12-1.el10_1RLSA-2025:23940
Rocky Linux:8python3.120:3.12.12-1.el8_10RLSA-2026:0123
Rocky Linux:9python3.120:3.12.12-1.el9_7RLSA-2025:23323
Rocky Linux:9python3.90:3.9.25-2.el9_7RLSA-2025:23342
Rocky Linux:8python3x-pip0:20.2.4-9.module+el8.10.0+1721+e52d6351RLSA-2025:23530
Rocky Linux:8python3x-pip0:20.2.4-9.module+el8.10.0+1860+afcc1c71RLSA-2025:23530
Rocky Linux:8python3x-pyparsing0:2.4.7-5.module+el8.10.0+1582+bc278001RLSA-2025:23530
Rocky Linux:8python3x-pyparsing0:2.4.7-5.module+el8.10.0+1860+afcc1c71RLSA-2025:23530
Rocky Linux:8python3x-setuptools0:50.3.2-7.module+el8.10.0+2057+30213a2bRLSA-2025:23530
Rocky Linux:8python3x-six0:1.15.0-3.module+el8.10.0+1582+bc278001RLSA-2025:23530
Rocky Linux:8python3x-six0:1.15.0-3.module+el8.10.0+1860+afcc1c71RLSA-2025:23530
Rocky Linux:8scipy0:1.5.4-5.module+el8.10.0+1860+afcc1c71RLSA-2025:23530
Rocky Linux:8scipy0:1.5.4-5.module+el8.10.0+1582+bc278001RLSA-2025:23530
Ubuntu:22.04:LTSpython3.103.10.12-1~22.04.12USN-7886-1
Ubuntu:22.04:LTSpython3.103.10.12-1~22.04.12UBUNTU-CVE-2025-8291
Ubuntu:24.04:LTSpython3.123.12.3-1ubuntu0.9USN-7886-1
Ubuntu:24.04:LTSpython3.123.12.3-1ubuntu0.9UBUNTU-CVE-2025-8291
Ubuntu:25.10python3.133.13.7-1ubuntu0.1UBUNTU-CVE-2025-8291
Ubuntu:25.10python3.133.13.7-1ubuntu0.1USN-7886-2
Ubuntu:25.10python3.14no fix listedUBUNTU-CVE-2025-8291

Affected products (as reported)

VendorProductVersions
Python Software Foundation CPython 0 – before 3.9.243.10.0 – before 3.10.193.11.0 – before 3.11.143.12.0 – before 3.12.123.13.0 – before 3.13.103.14.0 – before 3.14.1

Weakness: CWE-1285 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

References