CVE-2026-19445
Use-after-free of a server-side SSLContext when sni_callback switches contexts
02 Description
Use-after-free of a server-side SSLContext when sni_callback switches contexts
03 Exploitation and scoring
- Exploitation
- Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
- SSVC decision
- Not assessed by CISA
- EPSS probability
- 0.52% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 44.2% of scored records. A rank, not a probability.
- NVD base score
- 9.2 (CVSS v4.0), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/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
- Awaiting Analysis. NVD last modified this record on 2026-10-03.
- Red Hat severity
- Important. 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
- 2026-09-30 16:16Z28 DAYS AGO
- Last updated
- 2026-10-03 00:36Z26 DAYS AGO
- Reserved
- 2026-08-10
- Assigning CNA
- PSF
- Record state
- PUBLISHED
- Severity
- Critical (CVSS 9.2)
- CNA CVSS vector
- CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N
- Weaknesses
- CWE-416Use After FreeVariant
- Data version
- 5.2
- Document digest
- bdc6f2c881df57fccb587727c238f9be5249643fca9dc7ed3c7610db003d47e2
05 Affected products
06 References
- github.comhttps://github.com/python/cpython/pull/158504
- mail.python.orghttps://mail.python.org/archives/list/security-announce@python.org/thread/QMQIUQB6WGGC3MI7I3WKQXOYOBDSPPS3/
- github.comhttps://github.com/python/cpython/issues/156293
- github.comhttps://github.com/python/cpython/commit/34a53dce8174da2fceb12fe084a4def02a10053d
- github.comhttps://github.com/python/cpython/commit/46133cd57d309652139ada74014aca7665ac552b
- github.comhttps://github.com/python/cpython/commit/63fab143d94cafae71850831acfb52041ba44af7
- github.comhttps://github.com/python/cpython/commit/cd7e51e7d4563866fbaa1e2521ae69b45daf3698
- github.comhttps://github.com/python/cpython/commit/d8717ed01717a9641686e6e6f83f0ab8af235e2c
- github.comhttps://github.com/python/cpython/commit/b12968cefe69ca1dcb8606c832ff73ee7dbf4ba8
- github.comhttps://github.com/python/cpython/commit/ec44b5a3258cbda947d5e07242ee562ed05ef24b
- www.openwall.comhttp://www.openwall.com/lists/oss-security/2026/09/30/17
07 Fixed in
AlmaLinux 8
- platform-python Fixed in 3.6.8-79.el8_10.alma.1
- platform-python-debug Fixed in 3.6.8-79.el8_10.alma.1
- platform-python-devel Fixed in 3.6.8-79.el8_10.alma.1
- python3-idle Fixed in 3.6.8-79.el8_10.alma.1
- python3-libs Fixed in 3.6.8-79.el8_10.alma.1
- python3-test Fixed in 3.6.8-79.el8_10.alma.1
- python3-tkinter Fixed in 3.6.8-79.el8_10.alma.1
- python3.12 Fixed in 3.12.15-2.el8_10
- python3.12-debug Fixed in 3.12.15-2.el8_10
- python3.12-devel Fixed in 3.12.15-2.el8_10
- python3.12-idle Fixed in 3.12.15-2.el8_10
- python3.12-libs Fixed in 3.12.15-2.el8_10
- python3.12-rpm-macros Fixed in 3.12.15-2.el8_10
- python3.12-test Fixed in 3.12.15-2.el8_10
- python3.12-tkinter Fixed in 3.12.15-2.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
- python-unversioned-command Fixed in 3.9.25-7.el9_8.6
- python3 Fixed in 3.9.25-7.el9_8.6
- python3-debug Fixed in 3.9.25-7.el9_8.6
- python3-devel Fixed in 3.9.25-7.el9_8.6
- python3-idle Fixed in 3.9.25-7.el9_8.6
- python3-libs Fixed in 3.9.25-7.el9_8.6
- python3-test Fixed in 3.9.25-7.el9_8.6
- python3-tkinter Fixed in 3.9.25-7.el9_8.6
- python3.12 Fixed in 3.12.15-1.el9_8
- python3.12-debug Fixed in 3.12.15-1.el9_8
- python3.12-devel Fixed in 3.12.15-1.el9_8
- python3.12-idle Fixed in 3.12.15-1.el9_8
- python3.12-libs Fixed in 3.12.15-1.el9_8
- python3.12-test Fixed in 3.12.15-1.el9_8
- python3.12-tkinter Fixed in 3.12.15-1.el9_8
- python3.14 Fixed in 3.14.8-1.el9_8
- python3.14-debug Fixed in 3.14.8-1.el9_8
- python3.14-devel Fixed in 3.14.8-1.el9_8
- python3.14-freethreading Fixed in 3.14.8-1.el9_8
- python3.14-freethreading-debug Fixed in 3.14.8-1.el9_8
- python3.14-freethreading-devel Fixed in 3.14.8-1.el9_8
- python3.14-freethreading-idle Fixed in 3.14.8-1.el9_8
- python3.14-freethreading-libs Fixed in 3.14.8-1.el9_8
- python3.14-freethreading-test Fixed in 3.14.8-1.el9_8
- python3.14-freethreading-tkinter Fixed in 3.14.8-1.el9_8
- python3.14-idle Fixed in 3.14.8-1.el9_8
- python3.14-libs Fixed in 3.14.8-1.el9_8
- python3.14-test Fixed in 3.14.8-1.el9_8
- python3.14-tkinter Fixed in 3.14.8-1.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 3.12.15-1.el10_2
- python3 Fixed in 3.12.15-1.el10_2
- python3-debug Fixed in 3.12.15-1.el10_2
- python3-devel Fixed in 3.12.15-1.el10_2
- python3-idle Fixed in 3.12.15-1.el10_2
- python3-libs Fixed in 3.12.15-1.el10_2
- python3-test Fixed in 3.12.15-1.el10_2
- python3-tkinter Fixed in 3.12.15-1.el10_2
- python3.14 Fixed in 3.14.8-1.el10_2
- python3.14-debug Fixed in 3.14.8-1.el10_2
- python3.14-devel Fixed in 3.14.8-1.el10_2
- python3.14-freethreading Fixed in 3.14.8-1.el10_2
- python3.14-freethreading-debug Fixed in 3.14.8-1.el10_2
- python3.14-freethreading-devel Fixed in 3.14.8-1.el10_2
- python3.14-freethreading-idle Fixed in 3.14.8-1.el10_2
- python3.14-freethreading-libs Fixed in 3.14.8-1.el10_2
- python3.14-freethreading-test Fixed in 3.14.8-1.el10_2
- python3.14-freethreading-tkinter Fixed in 3.14.8-1.el10_2
- python3.14-idle Fixed in 3.14.8-1.el10_2
- python3.14-libs Fixed in 3.14.8-1.el10_2
- python3.14-test Fixed in 3.14.8-1.el10_2
- python3.14-tkinter Fixed in 3.14.8-1.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
- platform-python Fixed in 3.6.8-79.el8_10.alma.1
- platform-python-debug Fixed in 3.6.8-79.el8_10.alma.1
- platform-python-devel Fixed in 3.6.8-79.el8_10.alma.1
- python3-idle Fixed in 3.6.8-79.el8_10.alma.1
- python3-libs Fixed in 3.6.8-79.el8_10.alma.1
- python3-test Fixed in 3.6.8-79.el8_10.alma.1
- python3-tkinter Fixed in 3.6.8-79.el8_10.alma.1
- python3.12 Fixed in 3.12.15-2.el8_10
- python3.12-debug Fixed in 3.12.15-2.el8_10
- python3.12-devel Fixed in 3.12.15-2.el8_10
- python3.12-idle Fixed in 3.12.15-2.el8_10
- python3.12-libs Fixed in 3.12.15-2.el8_10
- python3.12-rpm-macros Fixed in 3.12.15-2.el8_10
- python3.12-test Fixed in 3.12.15-2.el8_10
- python3.12-tkinter Fixed in 3.12.15-2.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
- python-unversioned-command Fixed in 3.9.25-7.el9_8.6
- python3 Fixed in 3.9.25-7.el9_8.6
- python3-debug Fixed in 3.9.25-7.el9_8.6
- python3-devel Fixed in 3.9.25-7.el9_8.6
- python3-idle Fixed in 3.9.25-7.el9_8.6
- python3-libs Fixed in 3.9.25-7.el9_8.6
- python3-test Fixed in 3.9.25-7.el9_8.6
- python3-tkinter Fixed in 3.9.25-7.el9_8.6
- python3.12 Fixed in 3.12.15-1.el9_8
- python3.12-debug Fixed in 3.12.15-1.el9_8
- python3.12-devel Fixed in 3.12.15-1.el9_8
- python3.12-idle Fixed in 3.12.15-1.el9_8
- python3.12-libs Fixed in 3.12.15-1.el9_8
- python3.12-test Fixed in 3.12.15-1.el9_8
- python3.12-tkinter Fixed in 3.12.15-1.el9_8
- python3.14 Fixed in 3.14.8-1.el9_8
- python3.14-debug Fixed in 3.14.8-1.el9_8
- python3.14-devel Fixed in 3.14.8-1.el9_8
- python3.14-freethreading Fixed in 3.14.8-1.el9_8
- python3.14-freethreading-debug Fixed in 3.14.8-1.el9_8
- python3.14-freethreading-devel Fixed in 3.14.8-1.el9_8
- python3.14-freethreading-idle Fixed in 3.14.8-1.el9_8
- python3.14-freethreading-libs Fixed in 3.14.8-1.el9_8
- python3.14-freethreading-test Fixed in 3.14.8-1.el9_8
- python3.14-freethreading-tkinter Fixed in 3.14.8-1.el9_8
- python3.14-idle Fixed in 3.14.8-1.el9_8
- python3.14-libs Fixed in 3.14.8-1.el9_8
- python3.14-test Fixed in 3.14.8-1.el9_8
- python3.14-tkinter Fixed in 3.14.8-1.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 3.12.15-1.el10_2
- python3 Fixed in 3.12.15-1.el10_2
- python3-debug Fixed in 3.12.15-1.el10_2
- python3-devel Fixed in 3.12.15-1.el10_2
- python3-idle Fixed in 3.12.15-1.el10_2
- python3-libs Fixed in 3.12.15-1.el10_2
- python3-test Fixed in 3.12.15-1.el10_2
- python3-tkinter Fixed in 3.12.15-1.el10_2
- python3.14 Fixed in 3.14.8-1.el10_2
- python3.14-debug Fixed in 3.14.8-1.el10_2
- python3.14-devel Fixed in 3.14.8-1.el10_2
- python3.14-freethreading Fixed in 3.14.8-1.el10_2
- python3.14-freethreading-debug Fixed in 3.14.8-1.el10_2
- python3.14-freethreading-devel Fixed in 3.14.8-1.el10_2
- python3.14-freethreading-idle Fixed in 3.14.8-1.el10_2
- python3.14-freethreading-libs Fixed in 3.14.8-1.el10_2
- python3.14-freethreading-test Fixed in 3.14.8-1.el10_2
- python3.14-freethreading-tkinter Fixed in 3.14.8-1.el10_2
- python3.14-idle Fixed in 3.14.8-1.el10_2
- python3.14-libs Fixed in 3.14.8-1.el10_2
- python3.14-test Fixed in 3.14.8-1.el10_2
- python3.14-tkinter Fixed in 3.14.8-1.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
- pypy3 No fix yet
- python3.11 Fixed in 3.11.2-6+deb12u9
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- pypy3 No fix yet
- python3.13 No fix yet
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- pypy3 Fixed in 8.0.1+dfsg-1
- python3.13 No fix yet
- python3.14 Fixed in 3.14.8-1
- python3.15 Fixed in 3.15.0~rc3-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 22.04 LTS
- python3.10 No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 24.04 LTS
- python3.12 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
- 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 26.10
- 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 Pro 14.04 LTS
- python2.7 No fix yet
- python3.4 No fix yet
- python3.5 No fix yet
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 No fix yet
- python3.5 No fix yet
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 No fix yet
- python3.6 No fix yet
- python3.7 No fix yet
- python3.8 No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 20.04 LTS
- python2.7 No fix yet
- python3.8 No fix yet
- python3.9 No fix yet
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 No fix yet
- python3.11 No fix yet
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.