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Recorded 19 Oct 2026 at 15:12 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

HEVC Video Extensions Remote Code Execution Vulnerability

Heap-based buffer overflow in Microsoft Windows Codecs Library allows an unauthorized attacker to execute code locally.

What it said

CVE
CVE-2026-58599
Severity
Critical
CVSS base score
7.8
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Impact
Remote Code Execution
Exploitation detected
Not reported by MSRC
Publicly disclosed
No
Exploitability
Exploitation Less Likely
Component
Microsoft Windows Codecs Library
Weakness
CWE-122: Heap-based Buffer Overflow
Issued by
Microsoft
Customer action
Required: apply the update
Affected products
HEVC Video Extensions, HEVC Video Extensions for Licensed Applications, HEVC Video Extensions from Device Manufacturer on Windows 10 Version 1809 for 32-bit Systems, HEVC Video Extensions from Device Manufacturer on Windows 10 Version 1809 for x64-based Systems, HEVC Video Extensions from Device Manufacturer on Windows 10 Version 21H2 for 32-bit Systems, HEVC Video Extensions from Device Manufacturer on Windows 10 Version 21H2 for ARM64-based Systems, HEVC Video Extensions from Device Manufacturer on Windows 10 Version 21H2 for x64-based Systems, HEVC Video Extensions from Device Manufacturer on Windows 10 Version 22H2 for 32-bit Systems, HEVC Video Extensions from Device Manufacturer on Windows 10 Version 22H2 for ARM64-based Systems, HEVC Video Extensions from Device Manufacturer on Windows 10 Version 22H2 for x64-based Systems, HEVC Video Extensions from Device Manufacturer on Windows 11 Version 23H2 for ARM64-based Systems, HEVC Video Extensions from Device Manufacturer on Windows 11 Version 23H2 for x64-based Systems, HEVC Video Extensions from Device Manufacturer on Windows 11 Version 24H2 for ARM64-based Systems, HEVC Video Extensions from Device Manufacturer on Windows 11 Version 24H2 for x64-based Systems, HEVC Video Extensions from Device Manufacturer on Windows 11 Version 25H2 for ARM64-based Systems, HEVC Video Extensions from Device Manufacturer on Windows 11 Version 25H2 for x64-based Systems, HEVC Video Extensions from Device Manufacturer on Windows 11 Version 26H1 for ARM64-based Systems, HEVC Video Extensions from Device Manufacturer on Windows 11 version 26H1 for x64-based Systems, HEVC Video Extensions from Device Manufacturer on Windows Server 2019, HEVC Video Extensions from Device Manufacturer on Windows Server 2019 (Server Core installation), HEVC Video Extensions from Device Manufacturer on Windows Server 2022, HEVC Video Extensions from Device Manufacturer on Windows Server 2022 (Server Core installation), HEVC Video Extensions from Device Manufacturer on Windows Server 2025, HEVC Video Extensions from Device Manufacturer on Windows Server 2025 (Server Core installation)
Updates that fix it
No KB listed
CISA KEV
Not listed in the collected catalog
EPSS
0.5%; scored 19 Oct 2026
Public exploit code
No Nuclei template listed
Published
8 Sep 2026 07:00 UTC
Last revised
8 Sep 2026 07:00 UTC
Revision note
Information published.

Source evidence when recorded

Microsoft security releases
Complete at observationRead 19 Oct 2026 at 15:11 UTC
CISA KEV
Complete at observationRead 19 Oct 2026 at 15:11 UTC
FIRST EPSS
Complete at observationRead 19 Oct 2026 at 15:11 UTC
Public detection templates (Nuclei)
Complete at observationRead 19 Oct 2026 at 15:11 UTC

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

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 (7)

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

  1. 19 Oct 2026 · 15:12:40 UTC EPSS0.5%; scored 18 Oct 2026 → 0.5%; scored 19 Oct 2026
  2. 18 Oct 2026 · 14:54:30 UTC EPSS0.5%; scored 16 Oct 2026 → 0.5%; scored 18 Oct 2026
  3. 18 Oct 2026 · 14:54:30 UTC Link: September 2026/security?release=2026-Sep#cves
  4. 16 Oct 2026 · 16:13:25 UTC EPSS0.5%; scored 15 Oct 2026 → 0.5%; scored 16 Oct 2026
  5. 15 Oct 2026 · 21:30:54 UTC EPSS0.5%; scored 14 Oct 2026 → 0.5%; scored 15 Oct 2026
  6. 15 Oct 2026 · 01:07:54 UTC EPSS0.5%; scored 13 Oct 2026 → 0.5%; scored 14 Oct 2026
  7. 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 11 Nov 06:50 UTC · 275 of 275 readable · 273 fully read · documentation 469/469 current

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