EIP-2026-115635

PRE-CVE

Microsoft DirectWrite / AFDKO - Out-of-Bounds Read in OpenType Font Handling Due to Undefined FontName Index

Title source: legacy
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for EIP-2026-115635. PoCs published by Google Security Research.

AI-analyzed exploit summary The exploit demonstrates an out-of-bounds read vulnerability in AFDKO's CFF Writer component, specifically in the `cfwSindexGetString` function, which can lead to memory disclosure. The PoC triggers the bug by crafting a malicious OpenType font file that causes an invalid SRI index (65535) to be accessed.

Description

Microsoft DirectWrite / AFDKO - Out-of-Bounds Read in OpenType Font Handling Due to Undefined FontName Index

Exploits (1)

exploitdb WORKING POC VERIFIED
by Google Security Research · textdoswindows
https://www.exploit-db.com/exploits/47100

The exploit demonstrates an out-of-bounds read vulnerability in AFDKO's CFF Writer component, specifically in the `cfwSindexGetString` function, which can lead to memory disclosure. The PoC triggers the bug by crafting a malicious OpenType font file that causes an invalid SRI index (65535) to be accessed.

Classification
Working Poc 95%
Attack Type
Info Leak
Complexity
Moderate
Reliability
Reliable
Target: AFDKO (Adobe Font Development Kit for OpenType) and Microsoft DirectWrite (Windows 10 1709+)
No auth needed
Prerequisites: Attacker must craft a malicious OpenType font file · Victim must process the font file using AFDKO or DirectWrite (e.g., via Microsoft Edge printing functionality)
devstral-2 · analyzed Feb 16, 2026 Full analysis →

Details

Status pre_cve
Tracked Since Feb 18, 2026