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CVE-2026-114583— tar filter allows writing outside destination via empty-named symlink

Quick assessment

Affected
Python Software Foundation CPython
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

可通过精心构造的链接条目（包括名称为空或类似目录名称的符号链接）被绕过，从而将后续归档成员重定向到预期提取目录之外。这使得恶意的 tar 归档能够在调用 并指定 时，将文件写入到目标目录之外，具体取决于执行提取进程所拥有的权限。 此漏洞是 CVE-2026-7774 在 中的对应问题，而 CVE-2026-7774 此前已涵盖了 的相关风险。

CVSS 6.9 · Medium
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I. Basic Information for CVE-2026-114583

Vulnerability Information
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Vulnerability Title
tar filter allows writing outside destination via empty-named symlink
Source: CVE Program / CVE List V5
Vulnerability Description
tarfile.tar_filter could be bypassed using crafted link entries, including symlinks with empty or directory-like names, to redirect later archive members outside the intended extraction directory. This allowed a malicious tar archive to cause tarfile.extractall() with filter="tar" to write files outside the destination directory, subject to the permissions of the extracting process. This is the tarfile.tar_filter counterpart of CVE-2026-7774, which covered tarfile.data_filter.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Python Software Foundation CPython 0 ~ 3.16.0 -

II. Public POCs for CVE-2026-114583

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III. Intelligence Information for CVE-2026-114583

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Patches & Fixes for CVE-2026-114583 (4)

Mailing List Discussions for CVE-2026-114583 (1)

Other References for CVE-2026-114583 (1)

IV. Related Vulnerabilities

Same product: CPython
Same vendor: Python Software Foundation

V. Comments for CVE-2026-114583

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