CVE-2026-4224
Stack overflow parsing XML with deeply nested DTD content models
02 Description
Stack overflow parsing XML with deeply nested DTD content models
03 Exploitation and scoring
- Exploitation
- Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
- SSVC decision
- ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
- AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
- Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
- EPSS probability
- 0.70% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 52.6% of scored records. A rank, not a probability.
- NVD base score
- 6.0 (CVSS v4.0), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:4.0/AV:N/AC:L/AT:P/PR:L/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
- NVD analysis status
- Modified. NVD last modified this record on 2026-08-13.
- Red Hat severity
- Moderate. Red Hat's rating for its own products, not a CVSS rating.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2026-03-16 17:52Z7 MO AGO
- Last updated
- 2026-08-13 00:27Z2 MO AGO
- Reserved
- 2026-03-15
- Assigning CNA
- PSF
- Record state
- PUBLISHED
- Severity
- Medium (CVSS 6.0)
- CNA CVSS vector
- CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
- Weaknesses
- Data version
- 5.2
- Document digest
- fe23bee2fdc98677053fe062e8a116ab4ed84b5c30a63da6d304f76398d78f41
05 Affected products
06 References
- github.comhttps://github.com/python/cpython/commit/eb0e8be3a7e11b87d198a2c3af1ed0eccf532768
- mail.python.orghttps://mail.python.org/archives/list/security-announce@python.org/thread/5M7CGUW3XBRY7II4DK43KF7NQQ3TPZ6R/
- github.comhttps://github.com/python/cpython/issues/145986
- github.comhttps://github.com/python/cpython/pull/145987
- github.comhttps://github.com/python/cpython/commit/196edfb06a7458377d4d0f4b3cd41724c1f3bd4a
- github.comhttps://github.com/python/cpython/commit/e0a8a6da90597a924b300debe045cdb4628ee1f3
- github.comhttps://github.com/python/cpython/commit/642865ddf4b232da1f3b1f7abcfa3254c4bfe785
- github.comhttps://github.com/python/cpython/commit/af856a7177326ac25d9f66cc6dd28b554d914fee
- github.comhttps://github.com/python/cpython/commit/24ce88b285f56ee11626cf5e472af3cd8cc7c621
- www.openwall.comhttp://www.openwall.com/lists/oss-security/2026/03/16/4
07 Fixed in
AlmaLinux 8
- python3.12 Fixed in 3.12.13-2.el8_10
- python3.12-debug Fixed in 3.12.13-2.el8_10
- python3.12-devel Fixed in 3.12.13-2.el8_10
- python3.12-idle Fixed in 3.12.13-2.el8_10
- python3.12-libs Fixed in 3.12.13-2.el8_10
- python3.12-rpm-macros Fixed in 3.12.13-2.el8_10
- python3.12-test Fixed in 3.12.13-2.el8_10
- python3.12-tkinter Fixed in 3.12.13-2.el8_10
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
AlmaLinux 9
- python3.12 Fixed in 3.12.13-2.el9_8
- python3.12-debug Fixed in 3.12.13-2.el9_8
- python3.12-devel Fixed in 3.12.13-2.el9_8
- python3.12-idle Fixed in 3.12.13-2.el9_8
- python3.12-libs Fixed in 3.12.13-2.el9_8
- python3.12-test Fixed in 3.12.13-2.el9_8
- python3.12-tkinter Fixed in 3.12.13-2.el9_8
- python3.14 Fixed in 3.14.4-2.el9_8
- python3.14-debug Fixed in 3.14.4-2.el9_8
- python3.14-devel Fixed in 3.14.4-2.el9_8
- python3.14-freethreading Fixed in 3.14.4-2.el9_8
- python3.14-freethreading-debug Fixed in 3.14.4-2.el9_8
- python3.14-freethreading-devel Fixed in 3.14.4-2.el9_8
- python3.14-freethreading-idle Fixed in 3.14.4-2.el9_8
- python3.14-freethreading-libs Fixed in 3.14.4-2.el9_8
- python3.14-freethreading-test Fixed in 3.14.4-2.el9_8
- python3.14-freethreading-tkinter Fixed in 3.14.4-2.el9_8
- python3.14-idle Fixed in 3.14.4-2.el9_8
- python3.14-libs Fixed in 3.14.4-2.el9_8
- python3.14-test Fixed in 3.14.4-2.el9_8
- python3.14-tkinter Fixed in 3.14.4-2.el9_8
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
AlmaLinux 10
- python-unversioned-command Fixed in 3.12.13-2.el10_2
- python3 Fixed in 3.12.13-2.el10_2
- python3-debug Fixed in 3.12.13-2.el10_2
- python3-devel Fixed in 3.12.13-2.el10_2
- python3-idle Fixed in 3.12.13-2.el10_2
- python3-libs Fixed in 3.12.13-2.el10_2
- python3-test Fixed in 3.12.13-2.el10_2
- python3-tkinter Fixed in 3.12.13-2.el10_2
- python3.14 Fixed in 3.14.4-2.el10_2
- python3.14-debug Fixed in 3.14.4-2.el10_2
- python3.14-devel Fixed in 3.14.4-2.el10_2
- python3.14-freethreading Fixed in 3.14.4-2.el10_2
- python3.14-freethreading-debug Fixed in 3.14.4-2.el10_2
- python3.14-freethreading-devel Fixed in 3.14.4-2.el10_2
- python3.14-freethreading-idle Fixed in 3.14.4-2.el10_2
- python3.14-freethreading-libs Fixed in 3.14.4-2.el10_2
- python3.14-freethreading-test Fixed in 3.14.4-2.el10_2
- python3.14-freethreading-tkinter Fixed in 3.14.4-2.el10_2
- python3.14-idle Fixed in 3.14.4-2.el10_2
- python3.14-libs Fixed in 3.14.4-2.el10_2
- python3.14-test Fixed in 3.14.4-2.el10_2
- python3.14-tkinter Fixed in 3.14.4-2.el10_2
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 8
- python3.12 Fixed in 3.12.13-2.el8_10
- python3.12-debug Fixed in 3.12.13-2.el8_10
- python3.12-devel Fixed in 3.12.13-2.el8_10
- python3.12-idle Fixed in 3.12.13-2.el8_10
- python3.12-libs Fixed in 3.12.13-2.el8_10
- python3.12-rpm-macros Fixed in 3.12.13-2.el8_10
- python3.12-test Fixed in 3.12.13-2.el8_10
- python3.12-tkinter Fixed in 3.12.13-2.el8_10
Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 9
- python3.12 Fixed in 3.12.13-2.el9_8
- python3.12-debug Fixed in 3.12.13-2.el9_8
- python3.12-devel Fixed in 3.12.13-2.el9_8
- python3.12-idle Fixed in 3.12.13-2.el9_8
- python3.12-libs Fixed in 3.12.13-2.el9_8
- python3.12-test Fixed in 3.12.13-2.el9_8
- python3.12-tkinter Fixed in 3.12.13-2.el9_8
- python3.14 Fixed in 3.14.4-2.el9_8
- python3.14-debug Fixed in 3.14.4-2.el9_8
- python3.14-devel Fixed in 3.14.4-2.el9_8
- python3.14-freethreading Fixed in 3.14.4-2.el9_8
- python3.14-freethreading-debug Fixed in 3.14.4-2.el9_8
- python3.14-freethreading-devel Fixed in 3.14.4-2.el9_8
- python3.14-freethreading-idle Fixed in 3.14.4-2.el9_8
- python3.14-freethreading-libs Fixed in 3.14.4-2.el9_8
- python3.14-freethreading-test Fixed in 3.14.4-2.el9_8
- python3.14-freethreading-tkinter Fixed in 3.14.4-2.el9_8
- python3.14-idle Fixed in 3.14.4-2.el9_8
- python3.14-libs Fixed in 3.14.4-2.el9_8
- python3.14-test Fixed in 3.14.4-2.el9_8
- python3.14-tkinter Fixed in 3.14.4-2.el9_8
Derived from AlmaLinux 9. Partial coverage: only packages taken from AlmaLinux 9 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 10
- python-unversioned-command Fixed in 3.12.13-2.el10_2
- python3 Fixed in 3.12.13-2.el10_2
- python3-debug Fixed in 3.12.13-2.el10_2
- python3-devel Fixed in 3.12.13-2.el10_2
- python3-idle Fixed in 3.12.13-2.el10_2
- python3-libs Fixed in 3.12.13-2.el10_2
- python3-test Fixed in 3.12.13-2.el10_2
- python3-tkinter Fixed in 3.12.13-2.el10_2
- python3.14 Fixed in 3.14.4-2.el10_2
- python3.14-debug Fixed in 3.14.4-2.el10_2
- python3.14-devel Fixed in 3.14.4-2.el10_2
- python3.14-freethreading Fixed in 3.14.4-2.el10_2
- python3.14-freethreading-debug Fixed in 3.14.4-2.el10_2
- python3.14-freethreading-devel Fixed in 3.14.4-2.el10_2
- python3.14-freethreading-idle Fixed in 3.14.4-2.el10_2
- python3.14-freethreading-libs Fixed in 3.14.4-2.el10_2
- python3.14-freethreading-test Fixed in 3.14.4-2.el10_2
- python3.14-freethreading-tkinter Fixed in 3.14.4-2.el10_2
- python3.14-idle Fixed in 3.14.4-2.el10_2
- python3.14-libs Fixed in 3.14.4-2.el10_2
- python3.14-test Fixed in 3.14.4-2.el10_2
- python3.14-tkinter Fixed in 3.14.4-2.el10_2
Derived from AlmaLinux 10. Partial coverage: only packages taken from AlmaLinux 10 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
Debian 12
- python3.11 Fixed in 3.11.2-6+deb12u8
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- python3.13 Fixed in 3.13.5-2+deb13u2
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- python3.13 Fixed in 3.13.14-1
- python3.14 Fixed in 3.14.3-4
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 20.04 LTS
- pypy3 No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 22.04 LTS
- pypy3 No fix yet
- python3.10 Fixed in 3.10.12-1~22.04.16
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 24.04 LTS
- pypy3 No fix yet
- python3.12 Fixed in 3.12.3-1ubuntu0.15
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 25.10
- pypy3 No fix yet
- python3.13 No fix yet
- python3.14 No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 26.04 LTS
- pypy3 No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 26.10
- pypy3 No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 14.04 LTS
- python2.7 Fixed in 2.7.6-8ubuntu0.6+esm30Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro
- python3.4 Fixed in 3.4.3-1ubuntu1~14.04.7+esm21Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro
- python3.5 Fixed in 3.5.2-2ubuntu0~16.04.4~14.04.1+esm11Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 16.04 LTS
- python2.7 Fixed in 2.7.12-1ubuntu0~16.04.18+esm22Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro
- python3.5 Fixed in 3.5.2-2ubuntu0~16.04.13+esm25Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 18.04 LTS
- python2.7 Fixed in 2.7.17-1~18.04ubuntu1.13+esm15Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- python3.6 Fixed in 3.6.9-1~18.04ubuntu1.13+esm10Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- python3.7 Fixed in 3.7.5-2ubuntu1~18.04.2+esm11Available with Ubuntu Pro: https://ubuntu.com/pro
- python3.8 Fixed in 3.8.0-3ubuntu1~18.04.2+esm11Available with Ubuntu Pro: https://ubuntu.com/pro
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 20.04 LTS
- python3.8 Fixed in 3.8.10-0ubuntu1~20.04.18+esm7Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- python3.9 Fixed in 3.9.5-3ubuntu0~20.04.1+esm11Available with Ubuntu Pro: https://ubuntu.com/pro
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 22.04 LTS
- python2.7 Fixed in 2.7.18-13ubuntu1.5+esm9Available with Ubuntu Pro: https://ubuntu.com/pro
- python3.11 Fixed in 3.11.0~rc1-1~22.04.1+esm2Available with Ubuntu Pro: https://ubuntu.com/pro
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.