CVE-2026-47667Public exploitNetwork attack vector

Service interruption via unbounded NIfTI header allocation

Published Jul 21, 2026 · Updated Jul 21, 2026

Resource exhaustion in GREYC CImg before 4.0.0 allows remote attackers to interrupt services with crafted Analyze/NIfTI files. The _load_analyze() path trusts the file's unsigned header_size, allocates that many bytes without a file-size bound, and leaks the buffer when fread is short. Exploitation requires a host application to process an attacker-controlled .hdr, .img, or .nii file and can cause an OOM kill or progressive memory exhaustion.

CVSS severity7.5
High
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in GREYC CImg before 4.0.0 allows remote attackers to interrupt services with crafted Analyze/NIfTI files. The _load_analyze() path trusts the file's unsigned header_size, allocates that many bytes without a file-size bound, and leaks the buffer when fread is short. Exploitation requires a host application to process an attacker-controlled .hdr, .img, or .nii file and can cause an OOM kill or progressive memory exhaustion.

The record

CVE
CVE-2026-47667
Published
Jul 21, 2026
Updated
Jul 21, 2026
Vendor
GREYC
Product
CImg
Classifications
CWE-789, CWE-401, CWE-1284, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 21, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 4.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

GREYC · CImgversion=< 4.0.0

Published CVSS scores

7.5GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-789Memory Allocation with Excessive Size Value
CWE-401Missing Release of Memory after Effective Lifetime
CWE-1284Improper Validation of Specified Quantity in Input
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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