Security November 2026 CVE-2026-100204
Use after free in HEIF Image Extensions allows an unauthorized attacker to execute code locally.
Severity Important
CVSS base score 7.0
Impact Remote Code Execution
Exploitation detected No known exploitation (MSRC assessment)
Exploitability Exploitation Less Likely
Publicly disclosed No (MSRC assessment)
EPSS · 30-day forecast No EPSS score collected
Customer action Required: follow the MSRC remediation guidance More details
CVSS vector CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Public detection template No Nuclei template is listed in the current collected catalog
Component HEIF Image Extensions
Weakness CWE-416: Use After Free
Issued by Microsoft
Last revised 10 Nov 2026 CVSS 3.1 base metrics Red raises the risk · green lowers it
Attack vector LocalAV:L
Attack complexity HighAC:H
Privileges required NonePR:N
User interaction RequiredUI:R
Scope UnchangedS:U
Confidentiality HighC:H
Integrity HighI:H
Availability HighA:H
0 KBs No KB listed No KB update is listed in the collected MSRC record. Check the MSRC advisory for product releases and other remedies.
8 affected products
HEIF Image Extension on Windows 10 version 1809 HEIF Image Extension on Windows 10 version 21H2 HEIF Image Extension on Windows 10 version 22H2 HEIF Image Extension on Windows 11 version 23H2 HEIF Image Extension on Windows 11 version 24H2 HEIF Image Extension on Windows 11 version 25H2 HEIF Image Extension on Windows 11 version 26H1 HEIF Image Extension on Windows 11 version 26H2 Source. This summary comes from MSRC's public CVRF document for November 2026. If the MSRC page is blocked in your browser, the NVD and CVE.org records carry the same identifier. None of this says whether your devices are affected.
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Explore global source statements, affected packages and advisory history for CVE-2026-100204 . The catalog has a separate collection scope from Microsoft release records.
CISA KEV is observed exploitation evidence. FIRST EPSS is a dated prediction of exploitation in the next 30 days. Missing scores are unknown. This collector requests predictions only for explicit CVE aliases in the public NuGet archive; Microsoft release views retain their existing prediction scope.
No collected risk observation for these identifiers. This does not establish absence of exploitation or a zero probability.
cve-program · CVE-2026-100204 Published HEIF Image Extensions Remote Code Execution Vulnerability Use after free in HEIF Image Extensions allows an unauthorized attacker to execute code locally.
Source published 10 Nov 2026 18:15:06 UTC
Source modified 10 Nov 2026 23:46:30 UTC
Observed here 11 Nov 2026 02:25:43 UTC
Source terms CVE Program Terms of Use Original source record · Cite this exact observation · Complete original publisher JSON
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CVSS 3.1 · 7.0 CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C