CVE-2019-20907

In Lib/tarfile.py in Python through 3.8.3, an attacker is able to craft a TAR archive leading to an infinite loop when opened by tarfile.open, because _proc_pax lacks header validation.

CVSS 3.1

7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS

3.0% chance of exploitation in the next 30 days; higher than 87% of CVEs (scores of 2026-10-25)

CWE

CWE-835

Published

2020-07-13

Modified

2026-10-14

Record from

the NVD, synced 2026-10-19

Affected

• canonical:ubuntu_linux
• debian:debian_linux
• fedoraproject:fedora
• netapp:active_iq_unified_manager
• netapp:cloud_volumes_ontap_mediator
• opensuse:leap
• oracle:zfs_storage_appliance_kit
• python:python

References

• http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00051.html
• http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00052.html
• http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00053.html
• http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00056.html
• https://bugs.python.org/issue39017

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