CVE-2026-47667

CImg Library is a C++ library for image processing. Prior to version 4.0.0 in `_load_analyze()`, the header_size field is read as an `unsigned int` from the first 4 bytes of an Analyze/NIfTI file and passed directly to `new unsigned char[header_size]` without being bounded against the actual file size. A value up to ~4 GB is accepted. If the subsequent `fread` returns `short` as it will for any malformed file), the function throws a `CImgIOException` and the allocated buffer is never freed. A 6-byte crafted file is sufficient to trigger an allocation of ~1.3 GB per call, with the full allocation leaked on every error path. The issue is reachable via `load_analyze()` and the generic `load()` when the file extension is .hdr, .img, or .nii. Version 4.0.0 fixes the issue.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/GreycLab/CImg/commit/6a69bf725ffd111a4c7dc61cc15e3661abd158ee
https://github.com/GreycLab/CImg/issues/480
https://github.com/GreycLab/CImg/security/advisories/GHSA-rmfc-grgj-qwhv

Configurations

No configuration.

History

21 Jul 2026, 20:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-07-21 20:17

Updated : 2026-07-21 20:17

NVD link : CVE-2026-47667

Mitre link : CVE-2026-47667

CVE.ORG link : CVE-2026-47667

JSON object : View

Products Affected

No product.

CWE

CWE-401

Missing Release of Memory after Effective Lifetime

CWE-789

Memory Allocation with Excessive Size Value

CWE-1284

Improper Validation of Specified Quantity in Input

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