CVE-2026-21679Network attack vector

Heap over-read via unterminated Unicode profile text

Published Jan 7, 2026 · Updated Jan 7, 2026

Heap-buffer overflow in iccDEV before 2.3.1.2 allows remote attackers to trigger an out-of-bounds read via crafted ICC profiles. CIccLocalizedUnicode::GetText() scans a UTF-16 buffer for a null terminator without limiting the pointer to m_nLength, so malformed text is read beyond the heap allocation. Exploitation requires a user or application to process an attacker-supplied profile; the demonstrated result is an AddressSanitizer abort, while confidentiality and integrity effects remain publicly undemonstrated.

CVSS severity8.8
High
EPSS probability0.38%
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 remote attackers to trigger an out-of-bounds read via crafted ICC profiles. CIccLocalizedUnicode::GetText() scans a UTF-16 buffer for a null terminator without limiting the pointer to m_nLength, so malformed text is read beyond the heap allocation. Exploitation requires a user or application to process an attacker-supplied profile; the demonstrated result is an AddressSanitizer abort, while confidentiality and integrity effects remain publicly undemonstrated.

The record

CVE
CVE-2026-21679
Published
Jan 7, 2026
Updated
Jan 7, 2026
Vendor
International Color Consortium
Product
iccDEV
Classifications
CWE-787, CWE-20, 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

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.8GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
CWE-20Improper Input Validation
T1204.002Malicious File

Public exploit references

No public exploit references are available in this record.

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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