CVE-2023-42299Public exploitNetwork attack vector

Code execution via unchecked GIF palette index

Published Nov 2, 2023 · Updated Sep 17, 2024

Heap-buffer overflow in OpenImageIO 2.4.12.0 allows remote attackers to execute code or crash an image-processing service via a crafted GIF. GIFInput::read_subimage_data uses each decoded pixel value as a palette index without checking it against the active color map's ColorCount, causing an out-of-bounds heap read. Exploitation requires a target application to process the malformed GIF; the demonstrated proof of concept aborts under AddressSanitizer, while the CVE record also reports code execution.

CVSS severity9.8
Critical
EPSS probability1.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-buffer overflow in OpenImageIO 2.4.12.0 allows remote attackers to execute code or crash an image-processing service via a crafted GIF. GIFInput::read_subimage_data uses each decoded pixel value as a palette index without checking it against the active color map's ColorCount, causing an out-of-bounds heap read. Exploitation requires a target application to process the malformed GIF; the demonstrated proof of concept aborts under AddressSanitizer, while the CVE record also reports code execution.

The record

CVE
CVE-2023-42299
Published
Nov 2, 2023
Updated
Sep 17, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-120
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 2, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

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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