Evidence used
- No CISA KEV confirmation is currently recorded.
- The selected CVSS metric records a network-reachable, unauthenticated path with no user interaction.
- EPSS is 1.00% for the current model date.
BlackTreeCVE IntelligenceFull vulnerability report · 2026
CVE-2026-100219High confidence
Microsoft QUIC Remote Code Execution Vulnerability
Microsoft · Windows 11 version 23H2
9.8CriticalCVSS 3.1
Within 72 hours
Patch availableCritical technical impact with a remotely reachable, unauthenticated path; no CISA KEV confirmation is currently recorded.
R
Open reassessment dashboard →Operational reassessment
Published severity in operational context
Published severityCritical→Operational priority:Critical, unchanged from published severity.unchanged
Compensating controls
- Validate the affected product branch and deploy the verified fixed release.
- Restrict the affected network interface to trusted sources where business-safe.
- Monitor vendor guidance and exploitation sources for a material change.
Verification
- Confirm that the asset runs Microsoft Windows 11 version 23H2 and falls inside the recorded affected range.
- Verify the installed build against the product-specific fixed version after deployment.
- Validate exposure, authentication requirements and compensating controls in the actual environment.
- Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Critical technical impact with a remotely reachable, unauthenticated path; no CISA KEV confirmation is currently recorded.
Patch available01
What, why and how
Use after free in Microsoft QUIC allows an unauthorized attacker to execute code over a network.
What
Use after free in Microsoft QUIC allows an unauthorized attacker to execute code over a network.
Why
The program can continue using memory after it has been released, producing unsafe and attacker-influenceable behaviour.
How
An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may execute code or commands in the affected security context.
What
Use after free in Microsoft QUIC allows an unauthorized attacker to execute code over a network.
Why
The program can continue using memory after it has been released, producing unsafe and attacker-influenceable behaviour.
How
An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may execute code or commands in the affected security context.
02
Exploit reality and attack path
CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.
Observed exploitation No confirmed evidence
?
Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.
Public PoC / exploit material None recorded
?
Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.
- Likely attack path
- a network path → Use After Free → execute code or commands in the affected security context
- Attack surface
- Network
- Privileges required
- None: unauthenticated exploitation is possible
- User interaction
- None
- Attack complexity
- Low: no specialised conditions are recorded
- Security boundary
- Unchanged: impact remains within the vulnerable component's security authority
- Weakness
?
CWE means Common Weakness Enumeration: a standard category for the underlying weakness. - CWE-416 ↗
CWE-416: Use After Free. The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory belongs to the code that operates on the new pointer.
- CVSS vector
?
CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity. CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:CCommon Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.
AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CHighConfidentiality impact: A successful attack can cause a major loss.IHighIntegrity impact: A successful attack can cause a major loss.AHighAvailability impact: A successful attack can cause a major loss.- Post-exploitation / living off the land
- After compromise, an attacker may use built-in shells, scripting engines, scheduled tasks and native network utilities for discovery, persistence or movement. This is a plausible LoTL path, not evidence that it has occurred for every attack.
03
Patch and workaround
Operational remediation based on structured source evidence.
- Status
?
Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change. - Patch available
- Affected
- Windows 11 version 23H2: 10.0.22631.0 < 10.0.22631.7652
- Windows 11 Version 23H2: 10.0.22631.0 < 10.0.22631.7652
- Windows 11 Version 24H2: 10.0.26100.0 < 10.0.26100.9711
- Windows 11 Version 25H2: 10.0.26200.0 < 10.0.26200.9711
- Windows 11 version 26H1: 10.0.28000.0 < 10.0.28000.3231
- Windows 11 Version 26H2: 10.0.26300.0 < 10.0.26300.9711
- Windows Server 2022: 10.0.20348.0 < 10.0.20348.5761
- Windows Server 2025: 10.0.26100.0 < 10.0.26100.33650
- Windows Server 2025 (Server Core installation): 10.0.26100.0 < 10.0.26100.33650
- Action
- Review the linked authoritative reference and apply the recorded fixed release appropriate to the affected product branch.
- Workaround
- No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
Official vendor articles5 stored documents
Linked articles are downloaded and versioned as source evidence. A CVE mention or approved update relationship does not, by itself, verify a fix for every product branch.
- October 13, 2026—KB5126646 (OS Build 26100.33650) | Microsoft Support →Original publisher ↗Searchable text snapshot · Captured 14 Oct 2026October 13, 2026—KB5126646 (OS Build 26100.33650) Applies To Windows Server 2025, all editions This cumulative update for Windows Server 2025 (KB5126646), includes the latest security fixes and improvements, along with non-security updates from last month’s optional preview release. Visit the Windows release health da
- October 13, 2026—KB5126653 (OS Build 22621.7652) | Microsoft Support →Original publisher ↗Searchable text snapshot · Captured 14 Oct 2026October 13, 2026—KB5126653 (OS Build 22621.7652) Applies To Windows 11 version 23H2, all editions This cumulative update for Windows 11, version 23H2 (KB5126653), includes the latest security fixes and improvements, along with non-security updates from last month’s optional preview release. Visit the Windows release h
- October 13, 2026—KB5126655 (OS Build 20348.5761) | Microsoft Support →Original publisher ↗Searchable text snapshot · Captured 14 Oct 2026October 13, 2026—KB5126655 (OS Build 20348.5761) Applies To Windows Server 2022 This cumulative update for Windows Server 2022 (KB5126655), includes the latest security fixes and improvements, along with non-security updates from last month’s optional preview release. Visit the Windows release health dashboard for the
- October 13, 2026—KB5127646 (OS Build 28000.3231) | Microsoft Support →Original publisher ↗Searchable text snapshot · Captured 14 Oct 2026October 13, 2026—KB5127646 (OS Build 28000.3231) Applies To Windows 11 version 26H1, all editions This cumulative update for Windows 11, version 26H1 (KB5127646) includes the latest security fixes and improvements, along with non-security updates from last month's optional preview release. Visit the Windows release he
- October 13, 2026—KB5127648 (OS Builds 26300.9711, 26200.9711 and 26100.9711) | Microsoft Support →Original publisher ↗Searchable text snapshot · Captured 14 Oct 2026October 13, 2026—KB5127648 (OS Builds 26300.9711, 26200.9711 and 26100.9711) Applies To Windows 11 version 26H2, all editions Windows 11 version 25H2, all editions Windows 11 version 24H2, all editions Want a quick overview?: Watch the Windows 11 release note video for this update. Announcements and messages This sec
04
Evidence and provenance
Published 13 Oct 2026 · Last source change 14 Oct 2026, 17:59 UTC · CWE-416 · Use After Free
CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source FIRST · tracked since 2026-10-14
?
The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.European sourceENISA EUVD · EUVD-2026-100332
Product sourceCNA
Remediation sourceCVE/CNA references
CWE sourceOther authority
NVD statusNVD awaiting enrichment
Core structured fields are present and their contributing authorities are shown above.
Material change intelligence
View recent updates ↗What changed after publication
- Vendor guidanceAuthoritative vendor guidance changed: removed remediation: acn.gov.it/aggiornamenti-mensili-microsoft-25.CNA ↗
- Before
- remediation: acn.gov.it/aggiornamenti-mensili-microsoft-25
- After
- no authoritative guidance recorded
- Remediation statusRemediation status changed from Mitigation available to Awaiting fix.CNA ↗
- Before
- Mitigation available
- After
- Awaiting fix
- Vendor guidanceAuthoritative vendor guidance changed: removed remediation: acn.gov.it/aggiornamenti-mensili-microsoft-25.CNA ↗
- Before
- remediation: acn.gov.it/aggiornamenti-mensili-microsoft-25
- After
- no authoritative guidance recorded
- Remediation statusRemediation status changed from Mitigation available to Awaiting fix.CNA ↗
- Before
- Mitigation available
- After
- Awaiting fix
- Remediation statusRemediation status changed from Awaiting fix to Mitigation available.CSIRT Italia ↗
- Before
- Awaiting fix
- After
- Mitigation available
- BlackTree coverageBlackTree article coverage changed from no BlackTree article to 1 BlackTree article.BlackTree editorial ↗
- Before
- no BlackTree article
- After
- 1 BlackTree article
- ENISA EUVD mappingEUVD-2026-100332 was added to the official ENISA EUVD mapping for this CVE.ENISA EUVD ↗
- Before
- not recorded
- After
- {"euvdId":"EUVD-2026-100332"}
- Catalogue recordCVE added to the BlackTree catalogue.CNA ↗
- CVSS scoreCVSS vector changed while the displayed base score remained 9.8.CNA ↗
- Before
- 9.8 (CVSS 3.1 · CNA · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
- After
- 9.8 (CVSS 3.1 · CNA · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C)
CVE published
Remediation guidance recorded
Technical terms and abbreviations used in this report
- CVE
- Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
- CVSS
- Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
- EPSS
- Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
- CWE
- Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
- CNA
- CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
- CISA ADP
- Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
- NVD
- National Vulnerability Database: NIST's enrichment service for CVE records.
- CERT / CSIRT
- A computer security incident response team that publishes warnings or coordinates incident response.
- PoC
- Proof of concept: public material that demonstrates or helps reproduce exploitation.
- CSAF
- Common Security Advisory Framework: a machine-readable format for security advisories.
- LoTL
- Living off the land: abuse of legitimate tools or system functions during an attack.