ZDI-26-543: Microsoft Windows ICC File Parsing Out-Of-Bounds Write Remote Code Execution Vulnerability
Admiralty grading (A–F · 1–6)
Source reliability
- A Completely reliable
- B Usually reliable
- C Fairly reliable
- D Not usually reliable
- E Unreliable
- F Cannot be judged
Information credibility
- 1 Confirmed
- 2 Probably true
- 3 Possibly true
- 4 Doubtful
- 5 Improbable
- 6 Cannot be judged
NATO Admiralty (AJP-2.1) grades confidence, independent of the risk score. Cross-source corroboration isn't tracked for non-CVE news, so single-source items are capped at a lower credibility number; a low number does not imply low quality.
Key metrics
- CVSS
- 7.8
- EPSS
- 1%
Affected versions
Key insight
The advisory highlights ICC color profiles as an attack vector for remote code execution on Windows; exploitation requires interaction with the color management library.
Description
CVE-2026-54984 affects ICC file parsing in Microsoft Windows, specifically the color management library Mscms.dll. A specially crafted ICC file can trigger an out-of-bounds write, allowing an attacker to execute arbitrary code in the context of the affected process. Exploitation requires interaction with the color management library, and the exact attack vector may vary depending on the implementation. The Zero Day Initiative (ZDI) rates the vulnerability as CVSS 7.8 (high). There is no information indicating active exploitation or inclusion in CISA KEV.
Risk score
- cvss base
- 78.00
- kev bonus
- 0.00
- epss bonus
- 0.00
- poc bonus
- 15.00
- raw before weight
- 93.00
- industry weight
- 1.21
- freshness factor
- 0.50
- exploitability factor
- 1.00
- days old
- 31.00
- vendor mismatch penalty
- 0.00
Path: operational