Bug 2457932 (CVE-2026-6100) - CVE-2026-6100 python: Python: Arbitrary code execution or information disclosure via use-after-free in decompression modules
Summary: CVE-2026-6100 python: Python: Arbitrary code execution or information disclos...
Keywords:
Status: NEW
Alias: CVE-2026-6100
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2458008 2458009 2458010 2458012 2458015 2458017 2458011 2458013 2458014 2458016 2458018 2458019
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-04-13 18:01 UTC by OSIDB Bzimport
Modified: 2026-05-07 18:12 UTC (History)
8 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2026:11277 0 None None None 2026-04-28 01:29:36 UTC
Red Hat Product Errata RHBA-2026:11357 0 None None None 2026-04-28 13:10:11 UTC
Red Hat Product Errata RHBA-2026:11717 0 None None None 2026-04-29 13:00:48 UTC
Red Hat Product Errata RHBA-2026:12342 0 None None None 2026-04-30 14:34:56 UTC
Red Hat Product Errata RHBA-2026:12484 0 None None None 2026-04-30 19:05:55 UTC
Red Hat Product Errata RHBA-2026:13621 0 None None None 2026-05-05 10:44:15 UTC
Red Hat Product Errata RHSA-2026:10711 0 None None None 2026-04-27 01:55:24 UTC
Red Hat Product Errata RHSA-2026:10745 0 None None None 2026-04-27 09:38:49 UTC
Red Hat Product Errata RHSA-2026:10774 0 None None None 2026-04-27 12:31:40 UTC
Red Hat Product Errata RHSA-2026:10949 0 None None None 2026-04-27 14:43:00 UTC
Red Hat Product Errata RHSA-2026:10950 0 None None None 2026-04-27 14:54:47 UTC
Red Hat Product Errata RHSA-2026:11077 0 None None None 2026-04-27 21:11:00 UTC
Red Hat Product Errata RHSA-2026:13692 0 None None None 2026-05-05 11:12:55 UTC
Red Hat Product Errata RHSA-2026:13812 0 None None None 2026-05-05 17:49:53 UTC
Red Hat Product Errata RHSA-2026:14652 0 None None None 2026-05-07 04:45:35 UTC
Red Hat Product Errata RHSA-2026:14653 0 None None None 2026-05-07 04:42:03 UTC
Red Hat Product Errata RHSA-2026:14656 0 None None None 2026-05-07 05:15:42 UTC

Description OSIDB Bzimport 2026-04-13 18:01:55 UTC 
Use-after-free (UAF) was possible in the `lzma.LZMADecompressor`, `bz2.BZ2Decompressor`, and `gzip.GzipFile` when a memory allocation fails with a `MemoryError` and the decompression instance is re-used. This scenario can be triggered if the process is under memory pressure. The fix cleans up the dangling pointer in this specific error condition.

The vulnerability is only present if the program re-uses decompressor instances across multiple decompression calls even after a `MemoryError` is raised during decompression. Using the helper functions to one-shot decompress data such as `lzma.decompress()`, `bz2.decompress()`, `gzip.decompress()`, and `zlib.decompress()` are not affected as a new decompressor instance is used per call. If the decompressor instance is not re-used after an error condition, this usage is similarly not vulnerable.
Comment 2 h0gr3 2026-04-21 15:31:02 UTC 
Any POC available?
Comment 9 errata-xmlrpc 2026-04-27 01:55:23 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:10711 https://access.redhat.com/errata/RHSA-2026:10711
Comment 10 errata-xmlrpc 2026-04-27 09:38:48 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:10745 https://access.redhat.com/errata/RHSA-2026:10745
Comment 11 errata-xmlrpc 2026-04-27 12:31:38 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:10774 https://access.redhat.com/errata/RHSA-2026:10774
Comment 12 errata-xmlrpc 2026-04-27 14:42:58 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:10949 https://access.redhat.com/errata/RHSA-2026:10949
Comment 13 errata-xmlrpc 2026-04-27 14:54:36 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:10950 https://access.redhat.com/errata/RHSA-2026:10950
Comment 14 errata-xmlrpc 2026-04-27 20:52:52 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:11062 https://access.redhat.com/errata/RHSA-2026:11062
Comment 15 errata-xmlrpc 2026-04-27 21:10:59 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:11077 https://access.redhat.com/errata/RHSA-2026:11077
Comment 19 errata-xmlrpc 2026-05-05 11:12:54 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:13692 https://access.redhat.com/errata/RHSA-2026:13692
Comment 20 errata-xmlrpc 2026-05-05 17:49:51 UTC 
This issue has been addressed in the following products:

  RHEL-8 based Middleware Containers

Via RHSA-2026:13812 https://access.redhat.com/errata/RHSA-2026:13812
Comment 21 errata-xmlrpc 2026-05-07 04:42:02 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Extended Update Support

Via RHSA-2026:14653 https://access.redhat.com/errata/RHSA-2026:14653
Comment 22 errata-xmlrpc 2026-05-07 04:45:33 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:14652 https://access.redhat.com/errata/RHSA-2026:14652
Comment 23 errata-xmlrpc 2026-05-07 05:15:41 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:14656 https://access.redhat.com/errata/RHSA-2026:14656
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