CVE-2023-26966Public exploit

Application crash via unchecked NaN lookup indices

Published Jun 29, 2023 · Updated Nov 3, 2025

Buffer overflow in uv_encode in libtiff 4.5.0 allows context-dependent attackers to crash an application via a crafted TIFF file. When a corrupted little-endian image is converted to big-endian output, uv_encode fails to reject NaN chromaticity values before deriving lookup indices, causing an out-of-bounds read and segmentation fault. Exploitation requires an application to process attacker-controlled TIFF data through the affected LogLuv encoding path, and the demonstrated consequence is a process crash.

CVSS severity5.5
Medium
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in uv_encode in libtiff 4.5.0 allows context-dependent attackers to crash an application via a crafted TIFF file. When a corrupted little-endian image is converted to big-endian output, uv_encode fails to reject NaN chromaticity values before deriving lookup indices, causing an out-of-bounds read and segmentation fault. Exploitation requires an application to process attacker-controlled TIFF data through the affected LogLuv encoding path, and the demonstrated consequence is a process crash.

The record

CVE
CVE-2023-26966
Published
Jun 29, 2023
Updated
Nov 3, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-120, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 29, 2023CVE publishedPublication date reported by the CVE source.
  2. Nov 3, 2025Record 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 vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.5NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1204.002Malicious File

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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