OpenImageIO CVE-2026-43908: High-Severity Integer Overflow Leads to RCE
The National Vulnerability Database has disclosed CVE-2026-43908, a critical vulnerability in OpenImageIO, a widely used toolset for image file manipulation in VFX and animation. This high-severity flaw, rated 8.8 CVSS, stems from a signed 32-bit integer overflow within the ConvertCbYCrYToRGB() function. Specifically, the i * 3 pixel-loop index expression can compute a large negative pointer offset, resulting in an out-of-bounds write.
This memory corruption ultimately crashes the process, but the implications are far more severe. Out-of-bounds writes are prime vectors for remote code execution. Attackers can meticulously craft image files to trigger this overflow, manipulating memory to execute arbitrary code within the context of the application processing the image. Given OpenImageIO’s prevalence in media pipelines, this isn’t just a crash; it’s a potential supply chain vulnerability for any organization handling external image assets.
The fix is available in OpenImageIO versions 3.0.18.0 and 3.1.13.0. Defenders must prioritize patching. This isn’t a theoretical risk; it’s a direct path for an attacker to compromise systems by simply feeding a malformed image. The attacker’s calculus here is straightforward: target an organization’s media ingestion pipeline with a poisoned asset, and gain a foothold.
What This Means For You
- If your organization uses OpenImageIO, especially in any pipeline processing untrusted image files, you are exposed. Prioritize patching to versions 3.0.18.0 or 3.1.13.0 immediately. Audit any systems that handle image uploads or conversions for the presence of vulnerable OpenImageIO versions. This is a critical RCE vector that requires urgent attention.
Related ATT&CK Techniques
🛡️ Detection Rules
3 rules · 6 SIEM formats3 detection rules auto-generated for this incident, mapped to MITRE ATT&CK. Sigma YAML is free — export to any SIEM format via the Intel Bot.
CVE-2026-43908: OpenImageIO Integer Overflow RCE Attempt
title: CVE-2026-43908: OpenImageIO Integer Overflow RCE Attempt
id: scw-2026-05-14-ai-1
status: experimental
level: critical
description: |
Detects attempts to exploit CVE-2026-43908 by looking for specific OpenImageIO executables (convert.exe, oiiotool.exe) being invoked with command lines that contain the vulnerable integer overflow expression 'i * 3' within the pixel-loop index calculation. This indicates a potential attempt to trigger the out-of-bounds write leading to RCE.
author: SCW Feed Engine (AI-generated)
date: 2026-05-14
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2026-43908/
tags:
- attack.initial_access
- attack.t1190
logsource:
category: process_creation
detection:
selection:
Image|endswith:
- 'convert.exe'
- 'oiiotool.exe'
CommandLine|contains:
- 'i * 3'
condition: selection
falsepositives:
- Legitimate administrative activity
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-43908 | Buffer Overflow | OpenImageIO versions prior to 3.0.18.0 and 3.1.13.0 |
| CVE-2026-43908 | Memory Corruption | OpenImageIO function ConvertCbYCrYToRGB() with signed 32-bit integer overflow in pixel-loop index expression i * 3 |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | May 14, 2026 at 23:17 UTC |
This content was AI-rewritten and enriched by Shimi's Cyber World based on the original source. All intellectual property rights remain with the original author.
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