CVE-2026-62897

Local code execution via font subsetter overflow

Published Aug 11, 2026 · Updated Aug 25, 2026

Integer overflow in Windows Presentation Foundation in Microsoft .NET and .NET Framework allows local users to execute code via crafted font data. The WPF TrueType subsetter performs size and record-count arithmetic on untrusted CMap, sbit, kern, and related font tables, and wrapped values can invalidate bounds assumptions and lead to out-of-bounds memory access during font subsetting. Reachability depends on a local application path that loads attacker-controlled font-bearing content and on user interaction, so successful exploitation runs code in the vulnerable process rather than providing network-only reach.

CVSS severity7.0
High
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in Windows Presentation Foundation in Microsoft .NET and .NET Framework allows local users to execute code via crafted font data. The WPF TrueType subsetter performs size and record-count arithmetic on untrusted CMap, sbit, kern, and related font tables, and wrapped values can invalidate bounds assumptions and lead to out-of-bounds memory access during font subsetting. Reachability depends on a local application path that loads attacker-controlled font-bearing content and on user interaction, so successful exploitation runs code in the vulnerable process rather than providing network-only reach.

The record

CVE
CVE-2026-62897
Published
Aug 11, 2026
Updated
Aug 25, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-190, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.0Microsoft CorporationCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound
T1204.002User Execution: Malicious File

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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