CVE-2026-21678Public exploit

Process crash via hard-coded curve count

Published Jan 7, 2026 · Updated Jan 7, 2026

Heap-buffer over-read in iccDEV before 2.3.1.2 allows local users to crash profile-processing tools via a crafted ICC profile. icMBBToXml passes a hard-coded curve count of three to icCurvesToXml, which indexes beyond the allocated MCurves array when the profile declares fewer channels. Exploitation requires a user or consuming application to process the crafted profile; the demonstrated consequence is a segmentation fault during XML conversion.

CVSS severity7.8
High
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-buffer over-read in iccDEV before 2.3.1.2 allows local users to crash profile-processing tools via a crafted ICC profile. icMBBToXml passes a hard-coded curve count of three to icCurvesToXml, which indexes beyond the allocated MCurves array when the profile declares fewer channels. Exploitation requires a user or consuming application to process the crafted profile; the demonstrated consequence is a segmentation fault during XML conversion.

The record

CVE
CVE-2026-21678
Published
Jan 7, 2026
Updated
Jan 7, 2026
Vendor
International Color Consortium
Product
iccDEV
Classifications
CWE-20, CWE-125, CWE-122, CWE-787, T1204.002, T1203
Attack vector
local
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 vectorlocal
Required privilegesunauthenticated

What is affected?

International Color Consortium · iccDEVversion=< 2.3.1.2

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
7.8GitHubCVSS:3.1/AV:L/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-20Improper Input Validation
CWE-125Out-of-bounds Read
CWE-122Heap-based Buffer Overflow
CWE-787Out-of-bounds Write
T1204.002Malicious File
T1203Exploitation for Client Execution

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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