Red Hat Security Advisory

RHSA-2026:74088

python3.9 security update

Released 2026-09-30 · Red Hat rating Important · View on Red Hat →

Fixed in

Red Hat CodeReady Linux Builder EUS (v.9.6) python3-3.9.21-2.el9_6.7, python3-debug-3.9.21-2.el9_6.7, python3-idle-3.9.21-2.el9_6.7 +2
Red Hat Enterprise Linux AppStream EUS (v.9.6) python-unversioned-command-3.9.21-2.el9_6.7, python3-devel-3.9.21-2.el9_6.7, python3-tkinter-3.9.21-2.el9_6.7
Red Hat Enterprise Linux BaseOS EUS (v.9.6) python3-3.9.21-2.el9_6.7, python3-libs-3.9.21-2.el9_6.7, python3.9-3.9.21-2.el9_6.7

Fixes 2 records

TI-2026-12884 CVE-2026-15308 · GHSA-7qj2-q5c8-cxx5

Incremental HTMLParser feed() allows CPU-exhaustion DoS via repeated unterminated markup declarations

MEDIUM 45

The incremental HTML parser (html.parser.HTMLParser) allows for CPU denial-of-service through repeated unterminated markup declarations when processing uncontrolled data.

CVSS 4.0HIGH 8.7 Network No auth No interaction EPSS 0.00637 Published 2026-07-09 Partial fix · 3.10.21, 3.11.16 +4 CWE-400

TI-2026-10297 CVE-2026-11940 · GHSA-9mc4-rqmq-h467

tarfile extraction filter bypass allows escaping the destination directory

MEDIUM 41

tarfile.extractall() with the 'data' or 'tar' filter could be bypassed by a crafted archive where a hardlink references a symlink stored at a deeper name than the hardlink itself.

CVSS 4.0HIGH 7.8 Network No auth No interaction EPSS 0.0075 Published 2026-06-23 Partial fix · 3.10.21, 3.11.16 +4 CWE-22