Source: Microsoft · Limited verification•Last verified: •Collection Degraded
CVE-2026-19445Unknown / EvaluatingCritical (raw)CVSS —
Use-after-free of a server-side SSLContext when sni_callback switches contexts
Published: 03 Oct 2026•Last updated: 07 Oct 2026, 07:52 AM IST•Source identifier: Unknown
Dossier completeness: source-provided sections 3 / 3 · rule guidance not available. Missing source facts count as incomplete.
CISA KEV catalog
Unknown
KEV status was not determined.
CVSS score
—Critical (raw)
Vector not recorded
Metric sourceUnknown
EPSS probability
0.4%0.004
Percentile36th
Weakness type
—
No further CWE recorded
Remediation
Patch status unknown
No fixed version or KB recorded
Why It Matters
Analysis dossierWhy It Matters
— Pending vendor disclosure
SOC priority
High Severity / Review
Actively exploited
Unknown
Publicly disclosed
Unknown
Risk basis: Critical CVSS without confirmed KEV exploitation
Affected Products & Remediation
1 source-backed productAffected products and versions (source)
- azl3 python3 3.12.14-2 on Azure Linux 3.0 · version range not provided by source · Microsoft MSRC · Source
Recorded patch / KBNot provided by source
Vendor or catalog guidance (source)
- Microsoft MSRC: Release Notes
Known exploitation (source facts)
Only what a source states. Unknown means no source has said either way; it is not "not exploited".
- CISA KEV
- Unknown
- Exploited (source statement)
- Unknown
- Publicly disclosed (source)
- Unknown
Suggested hunting (rule-based inference)
SecOps Signal recommendation (rule-based inference). These steps are hunting hypotheses from the vulnerability class; they do not state or imply that exploitation occurred here or anywhere.
No rule-based guidance for this vulnerability class
CISA KEV Record
CISA KEV status was not determined for this record.
Change History & Source Data
— No recorded material change
- CNA / source
- Unknown
- Record status · verification
- UPDATED · Unknown
- CPE
- Unknown
Evidence & Provenance
Linked by the query's stored exact CVE association. Review required tables and validation status before use.
Detection Hunting Query
Target: DeviceTvmSoftwareVulnerabilities•Defender XDR
Detect endpoints exposed to CVE-2026-19445
Purpose: Exposure assessment (Category: Exposure Check)Why linked: Query metadata names CVE-2026-19445
DeviceTvmSoftwareVulnerabilities| where CveId == "CVE-2026-19445"| project DeviceId, DeviceName, OSPlatform, OSVersion, SoftwareVendor, SoftwareName, SoftwareVersion, CveId, VulnerabilitySeverityLevel, RecommendedSecurityUpdate, RecommendedSecurityUpdateId| sort by VulnerabilitySeverityLevel descSchema Checked · Not runtime validatedSource: SecOps Signal deterministic template · Limited verificationStatic screening: Passed structure and schema checks; tenant execution is not verified.
Correlated briefings
SecOps Signal surfaces public advisory facts only. A missing value means the source has not published it, not that your environment is unaffected. No tenant inventory is connected.