CVE-2026-21685Public exploitNetwork attack vector

Service interruption via unchecked zero-length curve data

Published Jan 7, 2026 · Updated Jan 7, 2026

Undefined behavior in iccDEV before 2.3.1.2 allows remote attackers to interrupt applications that process crafted ICC profiles. CIccTagLut16::Read() reads a curve count from an untrusted LUT16 tag and binds a reference through the curve-data accessor even when that count leaves no element at index zero. No privileges are required, but a user must cause a consuming application to process the malformed profile; the observed result is a sanitizer-detected null-pointer reference and profile rejection.

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

Undefined behavior in iccDEV before 2.3.1.2 allows remote attackers to interrupt applications that process crafted ICC profiles. CIccTagLut16::Read() reads a curve count from an untrusted LUT16 tag and binds a reference through the curve-data accessor even when that count leaves no element at index zero. No privileges are required, but a user must cause a consuming application to process the malformed profile; the observed result is a sanitizer-detected null-pointer reference and profile rejection.

The record

CVE
CVE-2026-21685
Published
Jan 7, 2026
Updated
Jan 7, 2026
Vendor
International Color Consortium
Product
iccDEV
Classifications
CWE-758, CWE-20
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

7.1GitHubCVSS: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-758Reliance on Undefined, Unspecified, or Implementation-Defined Behavior
CWE-20Improper Input Validation

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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