CVE-2026-9669
bz2.BZ2Decompressor reuse after error can cause a stack buffer overflow
CVE-2026-9669 is fixed in 99 products on 3 platforms, first by idle-python3.14 3.14.4-1ubuntu0.1, released June 8, 2026. 10 other affected products have no fix yet. It is not reported as exploited. Patch Radar priority: High.
HighFixed on 3 platforms
CVSS
8.2
Moderate
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0043
37th percentile
bz2.BZ2Decompressor objects could be reused after a decompression error. If an application caught the resulting OSError and retried with the same decompressor, crafted input could cause the decompressor to resume from an invalid internal state and perform out-of-bounds writes to a stack buffer. This could crash the process when processing untrusted data.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Windows apps | |||
| Python 3.13 | 3.13.14 | Python 3.13 3.13.14 | Jun 10, 2026 |
| Python 3.14 | 3.14.6 | Python 3.14 3.14.6 | Jun 10, 2026 |
| Linux | |||
| idle-python3.10 · Ubuntu 22.04.1 LTS (jammy) | 3.10.12-1~22.04.16 | idle-python3.10 3.10.12-1~22.04.16 | Jul 7, 2026 |
| idle-python3.12 · Ubuntu 24.04.5 LTS (noble) | 3.12.3-1ubuntu0.15 | idle-python3.12 3.12.3-1ubuntu0.15 | Jul 7, 2026 |
| idle-python3.14 · Ubuntu 26.04.1 LTS (resolute) | 3.14.4-1ubuntu0.1 | idle-python3.14 3.14.4-1ubuntu0.1 | Jun 8, 2026 |
| libpython3.10 · Ubuntu 22.04.1 LTS (jammy) | 3.10.12-1~22.04.16 | libpython3.10 3.10.12-1~22.04.16 | Jul 7, 2026 |
| libpython3.10-minimal · Ubuntu 22.04.1 LTS (jammy) | 3.10.12-1~22.04.16 | libpython3.10-minimal 3.10.12-1~22.04.16 | Jul 7, 2026 |
| libpython3.10-stdlib · Ubuntu 22.04.1 LTS (jammy) | 3.10.12-1~22.04.16 | libpython3.10-stdlib 3.10.12-1~22.04.16 | Jul 7, 2026 |
| libpython3.10-testsuite · Ubuntu 22.04.1 LTS (jammy) | 3.10.12-1~22.04.16 | libpython3.10-testsuite 3.10.12-1~22.04.16 | Jul 7, 2026 |
| libpython3.12-minimal · Ubuntu 24.04.5 LTS (noble) | 3.12.3-1ubuntu0.15 | libpython3.12-minimal 3.12.3-1ubuntu0.15 | Jul 7, 2026 |
| libpython3.12-stdlib · Ubuntu 24.04.5 LTS (noble) | 3.12.3-1ubuntu0.15 | libpython3.12-stdlib 3.12.3-1ubuntu0.15 | Jul 7, 2026 |
| libpython3.12-testsuite · Ubuntu 24.04.5 LTS (noble) | 3.12.3-1ubuntu0.15 | libpython3.12-testsuite 3.12.3-1ubuntu0.15 | Jul 7, 2026 |
| libpython3.12t64 · Ubuntu 24.04.5 LTS (noble) | 3.12.3-1ubuntu0.15 | libpython3.12t64 3.12.3-1ubuntu0.15 | Jul 7, 2026 |
| libpython3.14 · Ubuntu 26.04.1 LTS (resolute) | 3.14.4-1ubuntu0.1 | libpython3.14 3.14.4-1ubuntu0.1 | Jun 8, 2026 |
| libpython3.14-minimal · Ubuntu 26.04.1 LTS (resolute) | 3.14.4-1ubuntu0.1 | libpython3.14-minimal 3.14.4-1ubuntu0.1 | Jun 8, 2026 |
| libpython3.14-stdlib · Ubuntu 26.04.1 LTS (resolute) | 3.14.4-1ubuntu0.1 | libpython3.14-stdlib 3.14.4-1ubuntu0.1 | Jun 8, 2026 |
| libpython3.14-testsuite · Ubuntu 26.04.1 LTS (resolute) | 3.14.4-1ubuntu0.1 | libpython3.14-testsuite 3.14.4-1ubuntu0.1 | Jun 8, 2026 |
| python · sles 15.7 | 2.7.18-150000.133.1 | SUSE-SU-2026:4411-1 | Oct 1, 2026 |
| python-base · sles 15.7 | 2.7.18-150000.133.1 | SUSE-SU-2026:4411-1 | Oct 1, 2026 |
| python-unversioned-command · amzn 2023 | 3.9.25-1.amzn2023.0.8 | ALAS2023-2026-1963 | Jul 20, 2026 |
| python3 · amzn 2023 | 3.9.25-1.amzn2023.0.8 | ALAS2023-2026-1963 | Jul 20, 2026 |
| python3 · sles 15.6 | 3.6.15-150300.10.129.1 | SUSE-SU-2026:4754-1 | Nov 7, 2026 |
| python3 · sles 15.7 | 3.6.15-150300.10.129.1 | SUSE-SU-2026:4754-1 | Nov 7, 2026 |
| python3-core · sles 15.6 | 3.6.15-150300.10.129.1 | SUSE-SU-2026:4754-1 | Nov 7, 2026 |
| python3-core · sles 15.7 | 3.6.15-150300.10.129.1 | SUSE-SU-2026:4754-1 | Nov 7, 2026 |
| python3-debug · amzn 2023 | 3.9.25-1.amzn2023.0.8 | ALAS2023-2026-1963 | Jul 20, 2026 |
| python3-devel · amzn 2023 | 3.9.25-1.amzn2023.0.8 | ALAS2023-2026-1963 | Jul 20, 2026 |
| python3-idle · amzn 2023 | 3.9.25-1.amzn2023.0.8 | ALAS2023-2026-1963 | Jul 20, 2026 |
| python3-libs · amzn 2023 | 3.9.25-1.amzn2023.0.8 | ALAS2023-2026-1963 | Jul 20, 2026 |
| python3-test · amzn 2023 | 3.9.25-1.amzn2023.0.8 | ALAS2023-2026-1963 | Jul 20, 2026 |
| python3-tkinter · amzn 2023 | 3.9.25-1.amzn2023.0.8 | ALAS2023-2026-1963 | Jul 20, 2026 |
| python3.10 · Ubuntu 22.04.1 LTS (jammy) | 3.10.12-1~22.04.16 | python3.10 3.10.12-1~22.04.16 | Jul 7, 2026 |
| python3.10-examples · Ubuntu 22.04.1 LTS (jammy) | 3.10.12-1~22.04.16 | python3.10-examples 3.10.12-1~22.04.16 | Jul 7, 2026 |
| python3.10-full · Ubuntu 22.04.1 LTS (jammy) | 3.10.12-1~22.04.16 | python3.10-full 3.10.12-1~22.04.16 | Jul 7, 2026 |
| python3.10-minimal · Ubuntu 22.04.1 LTS (jammy) | 3.10.12-1~22.04.16 | python3.10-minimal 3.10.12-1~22.04.16 | Jul 7, 2026 |
| python3.10-nopie · Ubuntu 22.04.1 LTS (jammy) | 3.10.12-1~22.04.16 | python3.10-nopie 3.10.12-1~22.04.16 | Jul 7, 2026 |
| python3.10-venv · Ubuntu 22.04.1 LTS (jammy) | 3.10.12-1~22.04.16 | python3.10-venv 3.10.12-1~22.04.16 | Jul 7, 2026 |
| python3.11 · Debian 12.15 (bookworm) | 3.11.2-6+deb12u9 | DEBIAN-CVE-2026-9669 | Jun 24, 2026 |
| python3.11 · amzn 2023 | 3.11.15-1.amzn2023.0.4 | ALAS2023-2026-1953 | Jul 20, 2026 |
| python3.11-debug · amzn 2023 | 3.11.15-1.amzn2023.0.4 | ALAS2023-2026-1953 | Jul 20, 2026 |
| python3.11-debuginfo · amzn 2023 | 3.11.15-1.amzn2023.0.4 | ALAS2023-2026-1953 | Jul 20, 2026 |
| python3.11-debugsource · amzn 2023 | 3.11.15-1.amzn2023.0.4 | ALAS2023-2026-1953 | Jul 20, 2026 |
| python3.11-devel · amzn 2023 | 3.11.15-1.amzn2023.0.4 | ALAS2023-2026-1953 | Jul 20, 2026 |
| python3.11-idle · amzn 2023 | 3.11.15-1.amzn2023.0.4 | ALAS2023-2026-1953 | Jul 20, 2026 |
| python3.11-libs · amzn 2023 | 3.11.15-1.amzn2023.0.4 | ALAS2023-2026-1953 | Jul 20, 2026 |
| python3.11-test · amzn 2023 | 3.11.15-1.amzn2023.0.4 | ALAS2023-2026-1953 | Jul 20, 2026 |
| python3.11-tkinter · amzn 2023 | 3.11.15-1.amzn2023.0.4 | ALAS2023-2026-1953 | Jul 20, 2026 |
| python3.12 · Ubuntu 24.04.5 LTS (noble) | 3.12.3-1ubuntu0.15 | python3.12 3.12.3-1ubuntu0.15 | Jul 7, 2026 |
| python3.12 · amzn 2023 | 3.12.13-2.amzn2023.0.4 | ALAS2023-2026-1954 | Jul 20, 2026 |
| python3.12-debug · amzn 2023 | 3.12.13-2.amzn2023.0.4 | ALAS2023-2026-1954 | Jul 20, 2026 |
| python3.12-debuginfo · amzn 2023 | 3.12.13-2.amzn2023.0.4 | ALAS2023-2026-1954 | Jul 20, 2026 |
| python3.12-debugsource · amzn 2023 | 3.12.13-2.amzn2023.0.4 | ALAS2023-2026-1954 | Jul 20, 2026 |
| python3.12-devel · amzn 2023 | 3.12.13-2.amzn2023.0.4 | ALAS2023-2026-1954 | Jul 20, 2026 |
| python3.12-examples · Ubuntu 24.04.5 LTS (noble) | 3.12.3-1ubuntu0.15 | python3.12-examples 3.12.3-1ubuntu0.15 | Jul 7, 2026 |
| python3.12-full · Ubuntu 24.04.5 LTS (noble) | 3.12.3-1ubuntu0.15 | python3.12-full 3.12.3-1ubuntu0.15 | Jul 7, 2026 |
| python3.12-idle · amzn 2023 | 3.12.13-2.amzn2023.0.4 | ALAS2023-2026-1954 | Jul 20, 2026 |
| python3.12-libs · amzn 2023 | 3.12.13-2.amzn2023.0.4 | ALAS2023-2026-1954 | Jul 20, 2026 |
| python3.12-minimal · Ubuntu 24.04.5 LTS (noble) | 3.12.3-1ubuntu0.15 | python3.12-minimal 3.12.3-1ubuntu0.15 | Jul 7, 2026 |
| python3.12-nopie · Ubuntu 24.04.5 LTS (noble) | 3.12.3-1ubuntu0.15 | python3.12-nopie 3.12.3-1ubuntu0.15 | Jul 7, 2026 |
| python3.12-test · amzn 2023 | 3.12.13-2.amzn2023.0.4 | ALAS2023-2026-1954 | Jul 20, 2026 |
| python3.12-tkinter · amzn 2023 | 3.12.13-2.amzn2023.0.4 | ALAS2023-2026-1954 | Jul 20, 2026 |
| python3.12-venv · Ubuntu 24.04.5 LTS (noble) | 3.12.3-1ubuntu0.15 | python3.12-venv 3.12.3-1ubuntu0.15 | Jul 7, 2026 |
| python3.13 · Debian 13.5 (trixie) | 3.13.5-2+deb13u3 | DEBIAN-CVE-2026-9669 | Jun 24, 2026 |
| python3.13 · amzn 2023 | 3.13.14-1.amzn2023.0.1 | ALAS2023-2026-1910 | Jul 6, 2026 |
| python3.13-debug · amzn 2023 | 3.13.14-1.amzn2023.0.1 | ALAS2023-2026-1910 | Jul 6, 2026 |
| python3.13-debuginfo · amzn 2023 | 3.13.14-1.amzn2023.0.1 | ALAS2023-2026-1910 | Jul 6, 2026 |
| python3.13-debugsource · amzn 2023 | 3.13.14-1.amzn2023.0.1 | ALAS2023-2026-1910 | Jul 6, 2026 |
| python3.13-devel · amzn 2023 | 3.13.14-1.amzn2023.0.1 | ALAS2023-2026-1910 | Jul 6, 2026 |
| python3.13-freethreading · amzn 2023 | 3.13.14-1.amzn2023.0.1 | ALAS2023-2026-1910 | Jul 6, 2026 |
| python3.13-freethreading-debug · amzn 2023 | 3.13.14-1.amzn2023.0.1 | ALAS2023-2026-1910 | Jul 6, 2026 |
| python3.13-idle · amzn 2023 | 3.13.14-1.amzn2023.0.1 | ALAS2023-2026-1910 | Jul 6, 2026 |
| python3.13-libs · amzn 2023 | 3.13.14-1.amzn2023.0.1 | ALAS2023-2026-1910 | Jul 6, 2026 |
| python3.13-test · amzn 2023 | 3.13.14-1.amzn2023.0.1 | ALAS2023-2026-1910 | Jul 6, 2026 |
| python3.13-tkinter · amzn 2023 | 3.13.14-1.amzn2023.0.1 | ALAS2023-2026-1910 | Jul 6, 2026 |
| python3.14 · Debian 14 | 3.14.6-1 | DEBIAN-CVE-2026-9669 | Jun 24, 2026 |
| python3.14 · Ubuntu 26.04.1 LTS (resolute) | 3.14.4-1ubuntu0.1 | python3.14 3.14.4-1ubuntu0.1 | Jun 8, 2026 |
| python3.14 · amzn 2023 | 3.14.6-1.amzn2023.0.1 | ALAS2023-2026-1929 | Jul 6, 2026 |
| python3.14-debug · amzn 2023 | 3.14.6-1.amzn2023.0.1 | ALAS2023-2026-1929 | Jul 6, 2026 |
| python3.14-debuginfo · amzn 2023 | 3.14.6-1.amzn2023.0.1 | ALAS2023-2026-1929 | Jul 6, 2026 |
| python3.14-debugsource · amzn 2023 | 3.14.6-1.amzn2023.0.1 | ALAS2023-2026-1929 | Jul 6, 2026 |
| python3.14-devel · amzn 2023 | 3.14.6-1.amzn2023.0.1 | ALAS2023-2026-1929 | Jul 6, 2026 |
| python3.14-examples · Ubuntu 26.04.1 LTS (resolute) | 3.14.4-1ubuntu0.1 | python3.14-examples 3.14.4-1ubuntu0.1 | Jun 8, 2026 |
| python3.14-freethreading · amzn 2023 | 3.14.6-1.amzn2023.0.1 | ALAS2023-2026-1929 | Jul 6, 2026 |
| python3.14-freethreading-debug · amzn 2023 | 3.14.6-1.amzn2023.0.1 | ALAS2023-2026-1929 | Jul 6, 2026 |
| python3.14-freethreading-devel · amzn 2023 | 3.14.6-1.amzn2023.0.1 | ALAS2023-2026-1929 | Jul 6, 2026 |
| python3.14-freethreading-idle · amzn 2023 | 3.14.6-1.amzn2023.0.1 | ALAS2023-2026-1929 | Jul 6, 2026 |
| python3.14-freethreading-libs · amzn 2023 | 3.14.6-1.amzn2023.0.1 | ALAS2023-2026-1929 | Jul 6, 2026 |
| python3.14-freethreading-test · amzn 2023 | 3.14.6-1.amzn2023.0.1 | ALAS2023-2026-1929 | Jul 6, 2026 |
| python3.14-freethreading-tkinter · amzn 2023 | 3.14.6-1.amzn2023.0.1 | ALAS2023-2026-1929 | Jul 6, 2026 |
| python3.14-full · Ubuntu 26.04.1 LTS (resolute) | 3.14.4-1ubuntu0.1 | python3.14-full 3.14.4-1ubuntu0.1 | Jun 8, 2026 |
| python3.14-gdbm · Ubuntu 26.04.1 LTS (resolute) | 3.14.4-1ubuntu0.1 | python3.14-gdbm 3.14.4-1ubuntu0.1 | Jun 8, 2026 |
| python3.14-idle · amzn 2023 | 3.14.6-1.amzn2023.0.1 | ALAS2023-2026-1929 | Jul 6, 2026 |
| python3.14-libs · amzn 2023 | 3.14.6-1.amzn2023.0.1 | ALAS2023-2026-1929 | Jul 6, 2026 |
| python3.14-minimal · Ubuntu 26.04.1 LTS (resolute) | 3.14.4-1ubuntu0.1 | python3.14-minimal 3.14.4-1ubuntu0.1 | Jun 8, 2026 |
| python3.14-nopie · Ubuntu 26.04.1 LTS (resolute) | 3.14.4-1ubuntu0.1 | python3.14-nopie 3.14.4-1ubuntu0.1 | Jun 8, 2026 |
| python3.14-test · amzn 2023 | 3.14.6-1.amzn2023.0.1 | ALAS2023-2026-1929 | Jul 6, 2026 |
| python3.14-tk · Ubuntu 26.04.1 LTS (resolute) | 3.14.4-1ubuntu0.1 | python3.14-tk 3.14.4-1ubuntu0.1 | Jun 8, 2026 |
| python3.14-tkinter · amzn 2023 | 3.14.6-1.amzn2023.0.1 | ALAS2023-2026-1929 | Jul 6, 2026 |
| python3.14-venv · Ubuntu 26.04.1 LTS (resolute) | 3.14.4-1ubuntu0.1 | python3.14-venv 3.14.4-1ubuntu0.1 | Jun 8, 2026 |
| python3.9-debuginfo · amzn 2023 | 3.9.25-1.amzn2023.0.8 | ALAS2023-2026-1963 | Jul 20, 2026 |
| python3.9-debugsource · amzn 2023 | 3.9.25-1.amzn2023.0.8 | ALAS2023-2026-1963 | Jul 20, 2026 |
| python311 · sles 15.6 | 3.11.17-150600.3.74.1 | SUSE-SU-2026:4946-1 | Nov 7, 2026 |
| python311 · sles 15.7 | 3.11.17-150600.3.74.1 | SUSE-SU-2026:4946-1 | Nov 7, 2026 |
| python311-core · sles 15.6 | 3.11.17-150600.3.74.1 | SUSE-SU-2026:4946-1 | Nov 7, 2026 |
| python311-core · sles 15.7 | 3.11.17-150600.3.74.1 | SUSE-SU-2026:4946-1 | Nov 7, 2026 |
| python312 · sles 15.6 | 3.12.14-150600.3.68.1 | SUSE-SU-2026:4534-1 | Oct 6, 2026 |
| python312-core · sles 15.6 | 3.12.14-150600.3.68.1 | SUSE-SU-2026:4534-1 | Oct 6, 2026 |
| python313 · sles 15.7 | 3.13.15-150700.4.56.1 | SUSE-SU-2026:4401-1 | Sep 30, 2026 |
| python313-core · sles 15.7 | 3.13.15-150700.4.56.1 | SUSE-SU-2026:4401-1 | Sep 30, 2026 |
| No fix yet | |||
| Python 2 (Windows apps) | No fix yet | no-fix | n/a |
| Python 3.10 (Windows apps) | No fix yet | no-fix | n/a |
| Python 3.11 (Windows apps) | No fix yet | no-fix | n/a |
| Python 3.12 (Windows apps) | No fix yet | no-fix | n/a |
| Python 3.5 (Windows apps) | No fix yet | no-fix | n/a |
| Python 3.6 (Windows apps) | No fix yet | no-fix | n/a |
| Python 3.7 (Windows apps) | No fix yet | no-fix | n/a |
| Python 3.8 (Windows apps) | No fix yet | no-fix | n/a |
| Python 3.9 (Windows apps) | No fix yet | no-fix | n/a |
| Python3 (macOS) | No fix yet | no-fix | n/a |
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