CVE-2026-3276
Potential DoS via quadratic complexity in unicodedata.normalize()
CVE-2026-3276 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: Routine.
RoutineFixed on 3 platforms
CVSS
6.3
Moderate
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0049
42nd percentile
unicodedata.normalize() can take excessive CPU time when processing specially crafted Unicode input containing long runs of combining characters with alternating Canonical Combining Class values. This affects all normalization forms.
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 | 2.7.18-150000.123.1 | SUSE-SU-2026:3635-1 | Aug 18, 2026 |
| python-base · sles 15.7 | 2.7.18-150000.123.1 | SUSE-SU-2026:3635-1 | Aug 18, 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-2026-3276 | 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-2026-3276 | 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-2026-3276 | 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 | 3.11.15-150600.3.65.1 | SUSE-SU-2026:3648-1 | Aug 19, 2026 |
| python311 · sles 15.7 | 3.11.15-150600.3.65.1 | SUSE-SU-2026:3648-1 | Aug 19, 2026 |
| python311-core · sles 15.6 | 3.11.15-150600.3.65.1 | SUSE-SU-2026:3648-1 | Aug 19, 2026 |
| python311-core · sles 15.7 | 3.11.15-150600.3.65.1 | SUSE-SU-2026:3648-1 | Aug 19, 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 | 3.13.14-150700.4.53.1 | SUSE-SU-2026:3649-1 | Aug 19, 2026 |
| python313-core · sles 15.7 | 3.13.14-150700.4.53.1 | SUSE-SU-2026:3649-1 | Aug 19, 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 |
Patch Radar data is free to use with attribution. Terms and how to credit it.
Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.