RHSA-2026:85239
Vulnerability from csaf_redhat - Published: 2026-10-19 16:38 - Updated: 2026-10-19 23:40Summary
Red Hat Security Advisory: python3 security update
Severity
Important
Notes
Topic: An update for python3 is now available for Red Hat Enterprise Linux 8.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems.
Security Fix(es):
* python: python: Arbitrary file deletion via race condition during temporary directory cleanup (CVE-2026-12345)
* python: python: Certificate verification bypass via missing server_hostname validation in SSLContext.wrap_bio() (CVE-2026-19553)
* python: Use-after-free of a server-side SSLContext when sni_callback switches contexts (CVE-2026-19445)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
A flaw was found in Python. A race condition during the cleanup of temporary directories allows a local attacker with write access to replace a directory with a symbolic link (a reference pointing to another location). This can lead to unauthorized deletion or alteration of files outside the temporary directory, performed with the privileges of the process executing the cleanup.
6.3 (Medium)
Affected products
Fixed
56 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:platform-python-0:3.6.8-79.el8_10.i686 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:platform-python-debug-0:3.6.8-79.el8_10.aarch64 | — |
Vendor Fix
fix
Workaround
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|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:platform-python-debug-0:3.6.8-79.el8_10.i686 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:platform-python-debug-0:3.6.8-79.el8_10.ppc64le | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:platform-python-debug-0:3.6.8-79.el8_10.s390x | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:platform-python-debug-0:3.6.8-79.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
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|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:platform-python-devel-0:3.6.8-79.el8_10.aarch64 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:platform-python-devel-0:3.6.8-79.el8_10.i686 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:platform-python-devel-0:3.6.8-79.el8_10.ppc64le | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:platform-python-devel-0:3.6.8-79.el8_10.s390x | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:platform-python-devel-0:3.6.8-79.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:python3-debuginfo-0:3.6.8-79.el8_10.aarch64 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:python3-debuginfo-0:3.6.8-79.el8_10.i686 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:python3-debuginfo-0:3.6.8-79.el8_10.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:python3-debuginfo-0:3.6.8-79.el8_10.s390x | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:python3-debuginfo-0:3.6.8-79.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:python3-debugsource-0:3.6.8-79.el8_10.aarch64 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:python3-debugsource-0:3.6.8-79.el8_10.i686 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:python3-debugsource-0:3.6.8-79.el8_10.ppc64le | — |
Vendor Fix
fix
Workaround
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|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:python3-debugsource-0:3.6.8-79.el8_10.s390x | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:python3-debugsource-0:3.6.8-79.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:python3-idle-0:3.6.8-79.el8_10.aarch64 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:python3-idle-0:3.6.8-79.el8_10.i686 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:python3-idle-0:3.6.8-79.el8_10.ppc64le | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:python3-idle-0:3.6.8-79.el8_10.s390x | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:python3-idle-0:3.6.8-79.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:python3-test-0:3.6.8-79.el8_10.i686 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:python3-tkinter-0:3.6.8-79.el8_10.aarch64 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:python3-tkinter-0:3.6.8-79.el8_10.i686 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:python3-tkinter-0:3.6.8-79.el8_10.ppc64le | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:python3-tkinter-0:3.6.8-79.el8_10.s390x | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:python3-tkinter-0:3.6.8-79.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:platform-python-0:3.6.8-79.el8_10.aarch64 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:platform-python-0:3.6.8-79.el8_10.ppc64le | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:platform-python-0:3.6.8-79.el8_10.s390x | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:platform-python-0:3.6.8-79.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:python3-0:3.6.8-79.el8_10.src | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:python3-debuginfo-0:3.6.8-79.el8_10.aarch64 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:python3-debuginfo-0:3.6.8-79.el8_10.i686 | — |
Vendor Fix
fix
Workaround
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|
| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:python3-debuginfo-0:3.6.8-79.el8_10.ppc64le | — |
Vendor Fix
fix
Workaround
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|
| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:python3-debuginfo-0:3.6.8-79.el8_10.s390x | — |
Vendor Fix
fix
Workaround
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|
| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:python3-debuginfo-0:3.6.8-79.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
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|
| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:python3-debugsource-0:3.6.8-79.el8_10.aarch64 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:python3-debugsource-0:3.6.8-79.el8_10.i686 | — |
Vendor Fix
fix
Workaround
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|
| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:python3-debugsource-0:3.6.8-79.el8_10.ppc64le | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:python3-debugsource-0:3.6.8-79.el8_10.s390x | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:python3-debugsource-0:3.6.8-79.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
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|
| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:python3-libs-0:3.6.8-79.el8_10.aarch64 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:python3-libs-0:3.6.8-79.el8_10.i686 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:python3-libs-0:3.6.8-79.el8_10.ppc64le | — |
Vendor Fix
fix
Workaround
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|
| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:python3-libs-0:3.6.8-79.el8_10.s390x | — |
Vendor Fix
fix
Workaround
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|
| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:python3-libs-0:3.6.8-79.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:python3-test-0:3.6.8-79.el8_10.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:python3-test-0:3.6.8-79.el8_10.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:python3-test-0:3.6.8-79.el8_10.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:python3-test-0:3.6.8-79.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Moderate
A flaw was found in Python. A remote, unauthenticated TLS client can cause a use-after-free in a server that uses SSLContext.sni_callback to assign a different SSLSocket.context when selecting a certificate per server name, if nothing else keeps the original SSLContext alive. This can crash the server process or result in a call through a freed pointer. Servers that wrap their listening socket with a long-lived SSLContext are not affected. TLS clients are not affected.
8.1 (High)
Affected products
Fixed
56 products, the same list as for
CVE-2026-12345
Threats
Impact
Important
A flaw was found in Python. When establishing secure connections using the SSLContext.wrap_bio() function with hostname checking enabled, the module fails to validate that a target server hostname is supplied. Because of this missing check, certificate hostname verification is silently skipped rather than triggering an error. A remote man-in-the-middle attacker could exploit this defect to spoof trusted endpoints and intercept or tamper with sensitive encrypted traffic.
7.4 (High)
Affected products
Fixed
56 products, the same list as for
CVE-2026-12345
Threats
Impact
Important
References
27 references
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"text": "This vulnerability is rated as Moderate severity rather than Important because successful exploitation requires local system access, existing permissions to manipulate the target directory structure, and winning a narrow timing window during deletion. In Red Hat Enterprise Linux environments, standard temporary directory creation restricts access to the executing user, significantly limiting exposure to unprivileged local attackers. Applications running with elevated privileges that operate on shared or world-writable directories are at risk of unintended target file removal or permission tampering.",
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"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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{
"cve": "CVE-2026-19445",
"cwe": {
"id": "CWE-416",
"name": "Use After Free"
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"ids": [
{
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"text": "2544138"
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{
"category": "description",
"text": "A flaw was found in Python. A remote, unauthenticated TLS client can cause a use-after-free in a server that uses SSLContext.sni_callback to assign a different SSLSocket.context when selecting a certificate per server name, if nothing else keeps the original SSLContext alive. This can crash the server process or result in a call through a freed pointer. Servers that wrap their listening socket with a long-lived SSLContext are not affected. TLS clients are not affected.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "python: Use-after-free of a server-side SSLContext when sni_callback switches contexts",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This issue is rated Important. A remote unauthenticated client can trigger a server-side use-after-free when SNI callback code switches SSLSocket.context and drops the last reference to the original SSLContext, which can crash the process or call through a freed pointer (C:H/I:H/A:H). It is not Critical: exploitation requires a specific, non-default server pattern (per-connection or replaced SSLContext with sni_callback); the common pattern of wrapping the listening socket is explicitly not affected, so Attack Complexity is High. Red Hat ASLR, NX, and glibc heap hardening raise the bar for reliable code execution from the UAF but do not remove the crash/DoS impact, so Availability remains High.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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"category": "external",
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{
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"url": "https://www.cve.org/CVERecord?id=CVE-2026-19445"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-19445",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-19445"
},
{
"category": "external",
"summary": "https://github.com/python/cpython/issues/156293",
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"url": "https://mail.python.org/archives/list/security-announce@python.org/thread/QMQIUQB6WGGC3MI7I3WKQXOYOBDSPPS3/"
}
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{
"category": "vendor_fix",
"date": "2026-10-19T16:38:57+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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"title": "python: Use-after-free of a server-side SSLContext when sni_callback switches contexts"
},
{
"cve": "CVE-2026-19553",
"cwe": {
"id": "CWE-297",
"name": "Improper Validation of Certificate with Host Mismatch"
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"discovery_date": "2026-09-30T16:41:50.203373+00:00",
"ids": [
{
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"text": "2544127"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in Python. When establishing secure connections using the SSLContext.wrap_bio() function with hostname checking enabled, the module fails to validate that a target server hostname is supplied. Because of this missing check, certificate hostname verification is silently skipped rather than triggering an error. A remote man-in-the-middle attacker could exploit this defect to spoof trusted endpoints and intercept or tamper with sensitive encrypted traffic.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "python: python: Certificate verification bypass via missing server_hostname validation in SSLContext.wrap_bio()",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This issue is rated Important because a man-in-the-middle attacker can cause Python clients using SSLContext.wrap_bio() (or asyncio TLS helpers that call it) to skip certificate hostname verification when check_hostname is enabled but server_hostname is omitted or empty, compromising confidentiality and integrity of the TLS session (C:H/I:H). It is not Critical: exploitation requires an on-path attacker and that specific API misuse (AC:H).",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-19553"
},
{
"category": "external",
"summary": "RHBZ#2544127",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2544127"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-19553",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-19553"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-19553",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-19553"
},
{
"category": "external",
"summary": "https://github.com/python/cpython/issues/156793",
"url": "https://github.com/python/cpython/issues/156793"
},
{
"category": "external",
"summary": "https://github.com/python/cpython/pull/158503",
"url": "https://github.com/python/cpython/pull/158503"
},
{
"category": "external",
"summary": "https://mail.python.org/archives/list/security-announce@python.org/thread/QNZRG3YOAMTHDCMVCICXGY6YEFPY2VDL/",
"url": "https://mail.python.org/archives/list/security-announce@python.org/thread/QNZRG3YOAMTHDCMVCICXGY6YEFPY2VDL/"
}
],
"release_date": "2026-09-30T16:17:39.368000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-10-19T16:38:57+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 7.4,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
"version": "3.1"
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]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "python: python: Certificate verification bypass via missing server_hostname validation in SSLContext.wrap_bio()"
}
]
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.