CVE-2026-82049
tarfile extraction filters allow file modification and content disclosure via hard link to symlink
Description
In CPython 3.13 and earlier, the tarfile module's data and tar extraction filters are vulnerable to crafted archives containing a hard link to a symbolic link. Such archives may cause extraction to modify the permissions or modification time of a file outside the destination directory, or expose the contents of that file within the extracted tree.
INFO
Published Date :
Sept. 14, 2026, 7:17 p.m.
Last Modified :
Oct. 11, 2026, 1:16 a.m.
Remotely Exploit :
No
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-82049
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 4.0 | HIGH | 28c92f92-d60d-412d-b760-e73465c3df22 | ||||
| CVSS 4.0 | HIGH | [email protected] |
Solution
- Update CPython to version 3.13.1 or later.
- Apply vendor-supplied security patches promptly.
- Review and sanitize archive contents before extraction.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-82049.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-82049 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-82049
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-82049 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-82049 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
Oct. 11, 2026
Action Type Old Value New Value Added Reference https://github.com/python/cpython/commit/cccc7ec30212dba2abef53ce4a2bed112ddb690c -
CVE Modified by [email protected]
Oct. 02, 2026
Action Type Old Value New Value Added Affected Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/82xxx/CVE-2026-82049.json">CVE-2026-82049</a> -
CVE Modified by [email protected]
Sep. 30, 2026
Action Type Old Value New Value Added Affected Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/82xxx/CVE-2026-82049.json">CVE-2026-82049</a> -
CVE Modified by [email protected]
Sep. 30, 2026
Action Type Old Value New Value Added Reference https://github.com/python/cpython/commit/c66df4e70435d257fd488b35ea129c6f317433a8 Added Reference https://github.com/python/cpython/commit/cc1689830c6b9aaddded2fb9f2fe8116867e2c0e -
CVE Modified by [email protected]
Sep. 30, 2026
Action Type Old Value New Value Added Reference https://github.com/python/cpython/commit/197663d63afed27f66e10e23c194e8a634e60913 Added Reference https://github.com/python/cpython/commit/28f315486b3da0352b9a1de1c3c97f4127ba4771 -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Sep. 16, 2026
Action Type Old Value New Value Changed SSVC {'id': 'CVE-2026-82049', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-09-14T19:42:40.262634Z'} {'id': 'CVE-2026-82049', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-09-15T00:00:00+00:00'} -
CVE Modified by [email protected]
Sep. 15, 2026
Action Type Old Value New Value Added Affected Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/82xxx/CVE-2026-82049.json">CVE-2026-82049</a> Added Reference https://github.com/python/cpython/commit/b38be2e6cf9d989075ab73412c63e003ebad4ff3 Added Reference https://github.com/python/cpython/commit/b8f23e307097552eaea2604383a12ab280520d0d -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Sep. 14, 2026
Action Type Old Value New Value Added Reference http://www.openwall.com/lists/oss-security/2026/09/14/27 -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Sep. 14, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-82049', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-09-14T19:42:40.262634Z'} -
CVE Modified by [email protected]
Sep. 14, 2026
Action Type Old Value New Value Added Affected Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/82xxx/CVE-2026-82049.json">CVE-2026-82049</a> -
New CVE Received by [email protected]
Sep. 14, 2026
Action Type Old Value New Value Added Description In CPython 3.13 and earlier, the tarfile module's data and tar extraction filters are vulnerable to crafted archives containing a hard link to a symbolic link. Such archives may cause extraction to modify the permissions or modification time of a file outside the destination directory, or expose the contents of that file within the extracted tree. Added CVSS V4.0 AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/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 Added CWE CWE-59 Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/82xxx/CVE-2026-82049.json">CVE-2026-82049</a> Added Reference https://github.com/python/cpython/commit/5a57248b22ad3b9aafcaaadae2c304a1923daeca Added Reference https://github.com/python/cpython/issues/157190 Added Reference https://github.com/python/cpython/pull/157191 Added Reference https://mail.python.org/archives/list/[email protected]/thread/EFJWGAZJA56AKSBR2WHMHQZO7RRLZPRH/