Home/CVE/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 o
CVE

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 o

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.

HIGH · CVSS 7.5 EPSS 0.00323
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules8 YARA rules0
⬡

Weakness Classification

CWE-835Loop with Unreachable Exit Condition ('Infinite Loop')
▤

Affected Products & Versions

11
python>= 3.5.0 and < 3.5.10
python>= 3.6.0 and < 3.6.12
python>= 3.7.0 and < 3.7.9
python>= 3.8.0 and < 3.8.5
opensuse leapall versions
debian linuxall versions
fedoraproject fedoraall versions
canonical ubuntu linuxall versions
◈

Sigma Hunt Rules

8
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
producthighPython Reverse Shell Execution Via PTY And Socket Modules
producthighInline Python Execution - Spawn Shell Via OS System Library
producthighPython One-Liners with Base64 Decoding - Linux
producthighPython Function Execution Security Warning Disabled In Excel
producthighPython One-Liners with Base64 Decoding
producthighPython Spawning Pretty TTY on Windows
▣

Scoring & Timeline

7.5
HIGH · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD13 Jul 2020 · 01:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
⚑

Vendor Advisories

30
suse-csafopenSUSE-SU-2025:15713-1
suse-csafSUSE-SU-2025:20492-1
suse-csafSUSE-SU-2025:20154-1
suse-csafSUSE-SU-2025:20025-1
suse-csafopenSUSE-SU-2024:14434-1
🔗

References & Sources

27
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00051.htmlMailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00052.htmlMailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00053.htmlMailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00056.htmlMailing ListThird Party Advisory
https://bugs.python.org/issue39017Issue TrackingVendor Advisory
https://github.com/python/cpython/pull/21454PatchThird Party Advisory
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