The incremental HTML parser (html.parser.HTMLParser) allows for CPU denial-of-service through repeated unterminated markup declarations when processing uncontrolled data.
CVSS Details
- CVSS 4.0 Base Score: 8.7 (HIGH)
- CVSS 4.0 Vector: (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X)
- CVSS 3.1 Base Score: 7.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade python3.14-freethreading-tkinterUpgrade python3.12-tkinterUpgrade python3.14-testUpgrade python3-debugUpgrade python3.14-libsUpgrade python3.12-rpm-macrosUpgrade python3.12-debugUpgrade python3.12Upgrade python3-tkinterUpgrade python3-develUpgrade python3.14-freethreading-testUpgrade python3-testUpgrade python3.14-freethreadingUpgrade python3.14Upgrade python3.14-freethreading-idleUpgrade python3.14-freethreading-libsUpgrade python3.12-libsUpgrade python3.12-testUpgrade platform-pythonUpgrade python-unversioned-commandUpgrade python3.14-freethreading-debugUpgrade python3.14-freethreading-develUpgrade python3.12-idleUpgrade python3-libsUpgrade python3Upgrade python3.14-idleUpgrade platform-python-debugUpgrade python3-idleUpgrade python3.14-tkinterUpgrade python3.14-develUpgrade python3.14-debugUpgrade platform-python-develUpgrade python3.12-devel | Jul 15, 2026 | Jul 14, 2026 |
| Alpine Linux | — | Upgrade python3 | Aug 17, 2026 | Jul 9, 2026 |
| Amazon Linux Ami 2 | — | Upgrade python3-tkinterUpgrade python3-develUpgrade python3Upgrade python-debuginfoUpgrade python3-toolsUpgrade python3-debugUpgrade python-develUpgrade python-libsUpgrade python-toolsUpgrade python3-libsUpgrade python3-debuginfoUpgrade python-testUpgrade python3-testUpgrade tkinterUpgrade python-debugUpgrade python | Aug 5, 2026 | Aug 5, 2026 |
| Amazon_linux_2023 | — | Upgrade python3.14-testUpgrade python3-tkinterUpgrade python3.13-tkinterUpgrade python3.13-libsUpgrade python3.13-testUpgrade python3.13Upgrade python3.13-debugUpgrade python3-libsUpgrade python3.14-freethreading-develUpgrade python3.14-freethreading-testUpgrade python3.14-freethreading-libsUpgrade python3.12-develUpgrade python3.14-debugUpgrade python3.14Upgrade python-unversioned-commandUpgrade python3.14-freethreading-debugUpgrade python3-idleUpgrade python3.13-freethreading-debugUpgrade python3.12-testUpgrade python3.13-idleUpgrade python3-develUpgrade python3.9-debugsourceUpgrade python3.9-debuginfoUpgrade python3.12-debugsourceUpgrade python3.13-debugsourceUpgrade python3.13-freethreadingUpgrade python3.14-freethreadingUpgrade python3.14-develUpgrade python3.14-freethreading-idleUpgrade python3.12-debugUpgrade python3.14-debuginfoUpgrade python3.14-libsUpgrade python3.13-debuginfoUpgrade python3.14-freethreading-tkinterUpgrade python3.14-debugsourceUpgrade python3.12-idleUpgrade python3Upgrade python3-debugUpgrade python3.13-develUpgrade python3-testUpgrade python3.12-tkinterUpgrade python3.12-debuginfoUpgrade python3.12-libsUpgrade python3.14-tkinterUpgrade python3.12Upgrade python3.14-idle | Aug 10, 2026 | Jul 9, 2026 |
| Ibm Aix | — | Apply the fix or workaround for python_advisory21 | Sep 15, 2026 | Sep 15, 2026 |
| Redhat_linux | — | Upgrade python3.12-tkinterUpgrade python3.14-testUpgrade python3.14-develUpgrade python3.12Upgrade python3.12-debugsourceUpgrade python3.12-develUpgrade python3.9-debugsourceUpgrade python3.14-debuginfoUpgrade python3.14Upgrade python3.14-freethreading-libsUpgrade python3-tkinterUpgrade python3.14-freethreading-develUpgrade platform-pythonUpgrade python3.12-rpm-macrosUpgrade python3.14-debugsourceUpgrade python-unversioned-commandUpgrade python3.14-freethreading-testUpgrade python3-testUpgrade python3-debugsourceUpgrade python3.14-tkinterUpgrade python3.14-freethreading-tkinterUpgrade python3.14-freethreading-idleUpgrade python3-debuginfoUpgrade python3.14-libsUpgrade python3.14-freethreading-debugUpgrade platform-python-develUpgrade python3.12-testUpgrade python3.12-debugUpgrade python3-idleUpgrade python3.14-freethreadingUpgrade python3.12-idleUpgrade python3-libsUpgrade python3.12-libsUpgrade python3.14-idleUpgrade python3Upgrade python3.12-debuginfoUpgrade python3-debugUpgrade python3-develUpgrade python3.9-debuginfoUpgrade platform-python-debugUpgrade python3.14-debugNo solution exists | Jul 15, 2026 | Jul 9, 2026 |
| Rocky_linux | — | Upgrade python3.9-debuginfoUpgrade python3.14-freethreading-debugUpgrade python3.14-idleUpgrade python3-libsUpgrade python3.14-debugUpgrade python3.12-libsUpgrade python3.14-freethreading-tkinterUpgrade platform-python-develUpgrade python3-develUpgrade python3-debugUpgrade python3.14-tkinterUpgrade python3-debuginfoUpgrade python3.14-libsUpgrade python3.12-testUpgrade platform-python-debugUpgrade python3-tkinterUpgrade python3.14-freethreadingUpgrade python3-debugsourceUpgrade python3Upgrade python3-idleUpgrade python3.12-debugUpgrade python3.12-tkinterUpgrade python3.14Upgrade python3.14-testUpgrade python3.12-idleUpgrade python3.14-freethreading-develUpgrade python3.14-develUpgrade python3.12-develUpgrade python3.12-debugsourceUpgrade python3.12Upgrade python3.14-freethreading-libsUpgrade python3.14-debugsourceUpgrade platform-pythonUpgrade python3-testUpgrade python3.14-freethreading-testUpgrade python3.14-debuginfoUpgrade python3.12-debuginfoUpgrade python3.9-debugsourceUpgrade python3.14-freethreading-idle | Jul 17, 2026 | Jul 16, 2026 |
| Ubuntu | — | Upgrade libpython3.8 (Ubuntu Pro)Upgrade python3.4 (Ubuntu Pro)Upgrade python3.8 (Ubuntu Pro)Upgrade libpython3.4 (Ubuntu Pro)Upgrade libpython3.14Upgrade python3.6 (Ubuntu Pro)Upgrade libpython3.11 (Ubuntu Pro)Upgrade python3.12Upgrade libpython3.5 (Ubuntu Pro)Upgrade python3.10Upgrade python2.7 (Ubuntu Pro)Upgrade libpython3.10Upgrade libpython3.7 (Ubuntu Pro)Upgrade python3.11 (Ubuntu Pro)Upgrade python3.14Upgrade libpython3.9 (Ubuntu Pro)Upgrade python3.5 (Ubuntu Pro)Upgrade libpython2.7 (Ubuntu Pro)Upgrade libpython3.6 (Ubuntu Pro)Upgrade libpython3.12t64Upgrade python3.7 (Ubuntu Pro)Upgrade python3.9 (Ubuntu Pro) | Sep 14, 2026 | Sep 10, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Aug 20, 2026 | Jul 9, 2026 |
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