CVE-2026-119083 · Package
NO FIX YET · SEE WHAT TO DO
GluonTS, a Python library for time series modeling, fails to stop tar archives with symbolic or hard links from writing files outside the intended extraction directory. An attacker who supplies a crafted tar archive can overwrite arbitrary files with the privileges of the extracting process.
first public Nov 5, 2026 · 2 sources
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Teams that use the GluonTS Python library and extract tar archives through it, especially from sources they do not trust. Code that never extracts archives with GluonTS, or that only handles archives it created itself, is not exposed to this path. The bulletin does not give further detail on which GluonTS entry points reach the vulnerable extraction utility.
Not affected if gluonts-at-0.17.0-or-later, no-untrusted-archives
Who cares aws, gluonts, lab-disclosure, ml-pipelines, python
pip show gluonts and compare it to 0.17.0.python --version; on 3.14 or later, TarFile.extractall() applies the data extraction filter by default.gluonts CVE-2026-119083 - GluonTS arbitrary file write during archive extraction
Bulletin ID: 2026-171-AWS Scope: AWS Content Type: Important (requires attention) Publication Date: 11/05/2026 08:30 AM PST
Description:
GluonTS is an open-source Python library for probabilistic time series modeling.
We identified CVE-2026-119083, an issue in the archive extraction utility in GluonTS before 0.17.0. An actor who supplies a crafted tar archive containing symbolic or hard links might be able to write arbitrary files outside the intended extraction directory with the privileges of the extracting process.
Impacted versions: < 0.17.0
Resolution:
This issue has been addressed in gluonts version 0.17.0. We recommend upgrading to the latest version and ensuring any forked or derivative code is patched to incorporate the new fixes.
Workarounds:
If you cannot upgrade immediately, do not use GluonTS to extract tar archives from untrusted or unverified sources. As defense in depth, running on Python 3.14 or later causes TarFile.extractall() to apply the data extraction filter by default, which blocks the link-based traversal described here. Upgrading to 0.17.0 remains the recommended remediation.
References:
Acknowledgement:
We would like to thank Udit Jain for collaborating on this issue through the coordinated vulnerability disclosure process.
Please email aws-security@amazon.com with any security questions or concerns.
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0.17.0This page as .md · .json · CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/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
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