RHSA-2026:74867
Vulnerability from csaf_redhat - Published: 2026-10-02 09:48 - Updated: 2026-10-06 18:22Summary
Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update
Severity
Important
Notes
Topic: An update for Red Hat Hardened Images RPMs is now available.
Details: This update includes the following RPMs:
python3.15:
* python3.15-3.15.0~rc2-1.1.hum1 (aarch64, x86_64)
* python3.15-debug-3.15.0~rc2-1.1.hum1 (aarch64, x86_64)
* python3.15-devel-3.15.0~rc2-1.1.hum1 (aarch64, x86_64)
* python3.15-freethreading-3.15.0~rc2-1.1.hum1 (aarch64, x86_64)
* python3.15-freethreading-debug-3.15.0~rc2-1.1.hum1 (aarch64, x86_64)
* python3.15-freethreading-devel-3.15.0~rc2-1.1.hum1 (aarch64, x86_64)
* python3.15-freethreading-idle-3.15.0~rc2-1.1.hum1 (aarch64, x86_64)
* python3.15-freethreading-libs-3.15.0~rc2-1.1.hum1 (aarch64, x86_64)
* python3.15-freethreading-test-3.15.0~rc2-1.1.hum1 (aarch64, x86_64)
* python3.15-freethreading-tkinter-3.15.0~rc2-1.1.hum1 (aarch64, x86_64)
* python3.15-idle-3.15.0~rc2-1.1.hum1 (aarch64, x86_64)
* python3.15-libs-3.15.0~rc2-1.1.hum1 (aarch64, x86_64)
* python3.15-test-3.15.0~rc2-1.1.hum1 (aarch64, x86_64)
* python3.15-tkinter-3.15.0~rc2-1.1.hum1 (aarch64, x86_64)
* python3.15-3.15.0~rc2-1.1.hum1.src (src)
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 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
29 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat Hardened Images:python3.15-0:3.15.0~rc2-1.1.hum1@aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:python3.15-0:3.15.0~rc2-1.1.hum1@src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:python3.15-0:3.15.0~rc2-1.1.hum1@x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:python3.15-debug-0:3.15.0~rc2-1.1.hum1@aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:python3.15-debug-0:3.15.0~rc2-1.1.hum1@x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:python3.15-devel-0:3.15.0~rc2-1.1.hum1@aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:python3.15-devel-0:3.15.0~rc2-1.1.hum1@x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:python3.15-freethreading-0:3.15.0~rc2-1.1.hum1@aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:python3.15-freethreading-0:3.15.0~rc2-1.1.hum1@x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:python3.15-freethreading-debug-0:3.15.0~rc2-1.1.hum1@aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:python3.15-freethreading-debug-0:3.15.0~rc2-1.1.hum1@x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:python3.15-freethreading-devel-0:3.15.0~rc2-1.1.hum1@aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:python3.15-freethreading-devel-0:3.15.0~rc2-1.1.hum1@x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:python3.15-freethreading-idle-0:3.15.0~rc2-1.1.hum1@aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:python3.15-freethreading-idle-0:3.15.0~rc2-1.1.hum1@x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:python3.15-freethreading-libs-0:3.15.0~rc2-1.1.hum1@aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:python3.15-freethreading-libs-0:3.15.0~rc2-1.1.hum1@x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:python3.15-freethreading-test-0:3.15.0~rc2-1.1.hum1@aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:python3.15-freethreading-test-0:3.15.0~rc2-1.1.hum1@x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:python3.15-freethreading-tkinter-0:3.15.0~rc2-1.1.hum1@aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:python3.15-freethreading-tkinter-0:3.15.0~rc2-1.1.hum1@x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:python3.15-idle-0:3.15.0~rc2-1.1.hum1@aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:python3.15-idle-0:3.15.0~rc2-1.1.hum1@x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:python3.15-libs-0:3.15.0~rc2-1.1.hum1@aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:python3.15-libs-0:3.15.0~rc2-1.1.hum1@x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:python3.15-test-0:3.15.0~rc2-1.1.hum1@aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:python3.15-test-0:3.15.0~rc2-1.1.hum1@x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:python3.15-tkinter-0:3.15.0~rc2-1.1.hum1@aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:python3.15-tkinter-0:3.15.0~rc2-1.1.hum1@x86_64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Important
References
12 references
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"vulnerabilities": [
{
"cve": "CVE-2026-19445",
"cwe": {
"id": "CWE-416",
"name": "Use After Free"
},
"discovery_date": "2026-09-30T16:44:14.851300+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2544138"
}
],
"notes": [
{
"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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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-19445"
},
{
"category": "external",
"summary": "RHBZ#2544138",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2544138"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-19445",
"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",
"url": "https://github.com/python/cpython/issues/156293"
},
{
"category": "external",
"summary": "https://github.com/python/cpython/pull/158504",
"url": "https://github.com/python/cpython/pull/158504"
},
{
"category": "external",
"summary": "https://mail.python.org/archives/list/security-announce@python.org/thread/QMQIUQB6WGGC3MI7I3WKQXOYOBDSPPS3/",
"url": "https://mail.python.org/archives/list/security-announce@python.org/thread/QMQIUQB6WGGC3MI7I3WKQXOYOBDSPPS3/"
}
],
"release_date": "2026-09-30T16:16:04.923000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-10-02T09:48:46+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
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"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
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}
]
}
Loading…
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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.
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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.
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