CVE-2026-47667 (GCVE-0-2026-47667)

Vulnerability from cvelistv5 – Published: 2026-07-21 19:57 – Updated: 2026-07-23 14:13
VLAI
Title
CImg Library: Uncontrolled Memory Allocation and Memory Leak in `_load_analyze()` via Crafted NIfTI/Analyze Header
Summary
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.
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
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
Assigner
Impacted products
Vendor Product Version
GreycLab CImg Affected: < 4.0.0
Create a notification for this product.
Show details on NVD website

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
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