CVE-2026-21491Public exploit

Crash and memory disclosure via unbounded Unicode scan

Published Jan 6, 2026 · Updated Jan 6, 2026

Heap-based buffer overflow in iccDEV before 2.3.1.2 allows attackers to read adjacent memory or crash applications processing crafted ICC profiles. CIccTagTextDescription::ReleaseUnicode scans m_uzUnicodeText for a null terminator without bounding the loop by m_nUnicodeSize, so an unterminated one-unit Unicode string causes a two-byte out-of-bounds read. Exploitation requires a consuming application to process a crafted profile; the demonstrated read crosses the heap boundary and can disclose memory or terminate the process.

CVSS severity6.1
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer overflow in iccDEV before 2.3.1.2 allows attackers to read adjacent memory or crash applications processing crafted ICC profiles. CIccTagTextDescription::ReleaseUnicode scans m_uzUnicodeText for a null terminator without bounding the loop by m_nUnicodeSize, so an unterminated one-unit Unicode string causes a two-byte out-of-bounds read. Exploitation requires a consuming application to process a crafted profile; the demonstrated read crosses the heap boundary and can disclose memory or terminate the process.

The record

CVE
CVE-2026-21491
Published
Jan 6, 2026
Updated
Jan 6, 2026
Vendor
International Color Consortium
Product
iccDEV
Classifications
CWE-193, CWE-125, CWE-122, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 6, 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 vectorlocal
Required privilegesunauthenticated

What is affected?

International Color Consortium · iccDEVversion=< 2.3.1.2

Published CVSS scores

6.1GitHub, Inc.CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
7.1NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-193Off-by-one Error
CWE-125Out-of-bounds Read
CWE-122Heap-based Buffer Overflow
T1204.002User Execution: Malicious 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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