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.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-23 14:12 UTC
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
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7745 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
GreycLab CImg Affected: < 4.0.0
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

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