Red Hat Security Advisory

RHSA-2026:19570

python3.9 security update

Released 2026-05-20 · Red Hat rating Important · View on Red Hat →

Fixed in

Red Hat Enterprise Linux AppStream E4S (v.9.2) python-unversioned-command-3.9.16-1.el9_2.14, python3-devel-3.9.16-1.el9_2.14, python3-tkinter-3.9.16-1.el9_2.14
Red Hat Enterprise Linux BaseOS E4S (v.9.2) python3-3.9.16-1.el9_2.14, python3-libs-3.9.16-1.el9_2.14, python3.9-3.9.16-1.el9_2.14

Fixes 2 records

TI-2026-05344 CVE-2026-6100 · GHSA-pg25-7cx5-cvcm

Use-after-free in lzma.LZMADecompressor, bz2.BZ2Decompressor, and gzip.GzipFile after re-use under memory pressure

MEDIUM 42

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.

CVSS 4.0CRITICAL 9.1 Network No auth No interaction EPSS 0.00579 Published 2026-04-13 Partial fix · 3.10.21, 3.11.16 +4 CWE-416

TI-2026-04175 CVE-2026-4786 · GHSA-cccx-m78h-m3xw

Incomplete mitigation of CVE-2026-4519, %action expansion for command injection to webbrowser.open()

LOW 33

Mitgation of CVE-2026-4519 was incomplete.

CVSS 4.0HIGH 7.0 Local No auth User interaction EPSS 0.0029 Published 2026-04-13 Partial fix · 3.10.21, 3.11.16 +4 CWE-77