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Recorded 18 Oct 2026 at 14:54 UTC. This is what ChangeIntel recorded, including the title, summary, facts and links. It is not a statement of the source's current position. See the latest record.

The historical field “Public exploit code” recorded Nuclei detection-template membership. It did not establish exploit availability. The original recorded fields remain below.

The historical “Publicly disclosed: No” field could represent a missing MSRC assessment. It does not establish that the vulnerability was undisclosed. The original recorded fields remain below.

CVEMicrosoft Security Response Center

SSLContext.wrap_bio() missing validation of server_hostname parameter

SSLContext.wrap_bio() missing validation of server_hostname parameter

What it said

CVE
CVE-2026-19553
Severity
Important
CVSS base score
Not published
CVSS vector
Not published
Impact
Not stated
Exploitation detected
Not reported by MSRC
Publicly disclosed
No
Exploitability
Not assessed
Component
Mariner
Weakness
CWE-297: Improper Validation of Certificate with Host Mismatch
Issued by
PSF
Customer action
Required: apply the update
Affected products
azl3 python3 3.12.14-2 on Azure Linux 3.0
Updates that fix it
No KB listed
CISA KEV
Not listed in the collected catalog
EPSS
Not scored
Public exploit code
No Nuclei template listed
Published
3 Oct 2026 01:42 UTC
Last revised
16 Oct 2026 01:50 UTC
Revision note
Information published.

Source evidence when recorded

Microsoft security releases
Complete at observationRead 18 Oct 2026 at 14:53 UTC
CISA KEV
Complete at observationRead 18 Oct 2026 at 14:53 UTC
FIRST EPSS
Complete at observationRead 18 Oct 2026 at 14:53 UTC
Public detection templates (Nuclei)
Complete at observationRead 18 Oct 2026 at 14:53 UTC

Coverage describes the sources at this observation. A complete read then does not establish their current position.

What changed

  1. Affected products: azl3 python3 3.12.14-2 on Azure Linux 3.0, azl3 tensorflow 2.16.1-11 on Azure Linux 3.0 → azl3 python3 3.12.14-2 on Azure Linux 3.0
Page history

Changes are dated when recorded; day views use the last saved version from that UTC day, and citations stay fixed.

Cite this version
Field-level log (4)

Up to 100 recent field edits are shown; older edits may be outside retention.

  1. 18 Oct 2026 · 14:54:30 UTC Link: September 2026/security?release=2026-Sep#cves
  2. 16 Oct 2026 · 07:41:54 UTC Last revised7 Oct 2026 02:22 UTC → 16 Oct 2026 01:50 UTC
  3. 16 Oct 2026 · 07:41:54 UTC Affected productsazl3 python3 3.12.14-2 on Azure Linux 3.0, azl3 tensorflow 2.16.1-11 on Azure Linux 3.0 → azl3 python3 3.12.14-2 on Azure Linux 3.0
  4. 14 Oct 2026 · 11:22:42 UTC Source coverage: msrc-cvrfIncomplete → Current
ChangeIntel

An IT change radar: releases, security, known issues, retirements, documentation changes, and service status from public sources. Every item links to supporting evidence; dates and statuses can change after they are read.

Sources read 9 Nov 09:45 UTC · 257 of 275 readable · 255 fully read · documentation 469/469 current

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