What is the CVSS score of CVE-2026-21491?

CVE-2026-21491 has a CVSS 3.1 base score of 6.1 (Medium). CVSS vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H. EPSS exploitation probability: 0.0%.

Which versions of Iccdev are affected by CVE-2026-21491?

Organizations using versions should be aware of moderate risk from CVE-2026-21491, a heap-based buffer overflow vulnerability rated CVSS 6.1.. A patch is available.

Is there a public PoC exploit available for CVE-2026-21491?

Yes, a public proof-of-concept exploit is available for CVE-2026-21491. Prioritise patching immediately. EPSS: 0.0%.

Iccdev CVE-2026-21491

MEDIUM

Heap-based Buffer Overflow (CWE-122)

2026-01-06 security-advisories@github.com

Buffer Overflow Iccdev

6.1

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

6.1 MEDIUM

AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

PoC Detected

Jan 12, 2026 - 18:29 vuln.today

Public exploit code

Patch released

Jan 12, 2026 - 18:29 nvd

Patch available

CVE Published

Jan 06, 2026 - 19:16 nvd

MEDIUM 6.1

DescriptionGitHub Advisory

iccDEV provides a set of libraries and tools that allow for the interaction, manipulation, and application of International Color Consortium (ICC) color management profiles. A vulnerability present in versions prior to 2.3.1.2 affects users of the iccDEV library who process ICC color profiles. It results in unicode buffer overflow in CIccTagTextDescription. Version 2.3.1.2 contains a patch. No known workarounds are available.

AnalysisAI

A buffer overflow in iccDEV versions before 2.3.1.2 affects users processing ICC color profiles through the library's CIccTagTextDescription component, allowing local attackers with user interaction to cause denial of service or potentially read sensitive memory. Public exploit code exists for this vulnerability. …

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Vulnerability AssessmentAI

Risk Assessment	CVSS 6.1 (MEDIUM). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	An attacker could exploit this flaw, unicode buffer overflow in `CIccTagTextDescription`.
Remediation	A vendor patch is available — apply it immediately. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 30 days: Identify affected systems running versions and apply vendor patches as part of regular patch cycle. …

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CVE-2026-21491 vulnerability details – vuln.today

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