CVE-2026-21686Public exploitNetwork attack vector

Profile-processing interruption via LUT channel-count mismatch

Published Jan 7, 2026 · Updated Jan 7, 2026

Heap-buffer overflow in iccDEV before 2.3.1.2 allows attackers to interrupt profile processing with a crafted ICC profile. CIccTagLutAtoB::Validate indexes LUT curve arrays with color-space channel counts rather than LUT channel counts, causing an eight-byte read beyond the heap allocation. Triggering requires an application to process the profile; the demonstrated iccDumpProfile path aborts under AddressSanitizer, while other consumer behavior remains undefined.

CVSS severity7.1
High
EPSS probability0.28%
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 iccDEV before 2.3.1.2 allows attackers to interrupt profile processing with a crafted ICC profile. CIccTagLutAtoB::Validate indexes LUT curve arrays with color-space channel counts rather than LUT channel counts, causing an eight-byte read beyond the heap allocation. Triggering requires an application to process the profile; the demonstrated iccDumpProfile path aborts under AddressSanitizer, while other consumer behavior remains undefined.

The record

CVE
CVE-2026-21686
Published
Jan 7, 2026
Updated
Jan 7, 2026
Vendor
International Color Consortium
Product
iccDEV
Classifications
CWE-20, CWE-758, T1204.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 7, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 7, 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=< 2.3.1.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

International Color Consortium · iccDEVversion=< 2.3.1.2

Published CVSS scores

7.1GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/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-20Improper Input Validation
CWE-758Reliance on Undefined, Unspecified, or Implementation-Defined Behavior
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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