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CVE-2026-12299VulnerabilityPublished

Microsoft · JIT Miscompilation

Affects MicrosoftSource GCVE Database

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Authoritative record:CVE-2026-12299· Medium 5.4

Not known to be exploited · CVSS 5.4 Medium · patch available : update Microsoft when convenient.

Data as of 14 Nov 2026, 09:46 UTC

CVSS 3.1 base score
5.4Medium
How severe the flaw is on the 0–10 CVSS scale.
Patch
Available
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 16 Jun 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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

ProductAffectedFixed in
Microsoft Security Response Center MicrosoftAffected
  • <152
  • <140.12
  • <115.37
Fixed in
  • 152
  • 140.12
  • 115.37

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.

References

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