Microsoft · JIT Miscompilation
Affects MicrosoftSource GCVE Database
Not known to be exploited · CVSS 5.4 Medium · patch available : update Microsoft when convenient.
Data as of 14 Nov 2026, 09:46 UTC
- Patch
- Available
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:NExploitation evidence
Disclosed: evidence found.
CVE published 16 Jun 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 13 Nov 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| Microsoft Security Response Center Microsoft | Affected
| Fixed in
|
AI-suggested
No official fixes or workarounds are provided in the available data.
Description
CVE-2026-12299 is a vulnerability involving a JIT miscompilation issue in the DOM Core and HTML components of Microsoft software version 4.0. The vulnerability is identified as CWE-843, which relates to improper control flow or logic errors in code generation. No CVSS score or detailed impact information is provided, and there are no known exploits in the wild.