Out‑of‑Bound Read in Microsoft Windows GDI Bitmap Parsing (CVE‑2026‑25181) Enables Information Disclosure
What It Is — A low‑severity out‑of‑bounds read in the Windows GDI bitmap parser allows a local attacker to read memory beyond the allocated buffer, potentially exposing sensitive data. The flaw can be chained with other vulnerabilities for remote code execution.
Exploitability — Requires local access and user interaction (e.g., opening a crafted bitmap). No public exploit code is known; CVSS 3.3 (Low).
Affected Products — Microsoft Windows (all supported versions that include the GDI library).
TPRM Impact — Third‑party services that run on Windows or embed Windows‑based components may inadvertently leak data to malicious actors, increasing supply‑chain risk.
Recommended Actions —
- Deploy Microsoft’s security update for CVE‑2026‑25181 immediately.
- Enforce strict file‑type controls; block untrusted bitmap files from being opened on endpoint devices.
- Conduct a review of any third‑party applications that process bitmap images on Windows hosts.
- Update incident‑response playbooks to include this vulnerability as a potential data‑leak vector.
Source: Zero Day Initiative Advisory