How broadly exploitable is this undefined behavior issue?

Exploitability depends on how the undefined behavior manifests in a given build and environment. In many cases it may result only in crashes or data corruption, but in some configurations it could be shaped into a memory-safety exploit, especially if the affected code runs with significant privileges or processes attacker-controlled profiles at scale.

What level of access does an attacker need to leverage this vulnerability?

An attacker typically needs the ability to provide or influence ICC profiles consumed by the application, such as by uploading images, embedding profiles in documents, or feeding crafted color profiles into automated processing pipelines. No direct code execution access is required—only control over the profile data.

What is the safest general fix pattern for affected code?

The safest pattern is to ensure that all constructors and tag handlers validate their inputs thoroughly before use and do not rely on behavior that the language leaves undefined. This includes adding explicit bounds, range, and structural checks for all profile-driven values, and refactoring logic that depends on ambiguous or implementation-defined constructs into well-defined, defensive code paths.

Severity:

HIGH RISK

(7.1)

Undefined Behavior from Improper Input Handling (CWE-758/CWE-20) in iccDEV CIccTagCurve

CVE-2026-21687

Published:

Jan 7, 2026

Status:

Analyzed

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-306

CRITICAL RISK

CRITICAL

(9.8)

Missing Authentication for Forgot-Password Email Change API (CWE-306)

Account Takeover / Loss of Account Control

February 17, 2026

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in node-sonos-http-api TTS Provider for macOS

Remote Code Execution on the Server Host

February 17, 2026

Vulnerability Type

Category:

Undefined Behavior / Improper Input Validation

CWE:

CWE-20;CWE-758

Impact:

Potential Memory Corruption and Application Compromise

Severity:

HIGH RISK

(7.1)

CVSS Version:

3.1

Vulnerability Type

Category:

Undefined Behavior / Improper Input Validation

CWE:

CWE-20;CWE-758

Impact:

Potential Memory Corruption and Application Compromise

Severity:

HIGH RISK

(7.1)

CVSS Version:

3.1

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Undefined Behavior from Improper Input Handling (CWE-758/CWE-20) in iccDEV CIccTagCurve

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

CRITICAL RISK

CRITICAL

(9.8)

Missing Authentication for Forgot-Password Email Change API (CWE-306)

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in node-sonos-http-api TTS Provider for macOS

Vulnerability Type

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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