CVE-2026-21673Public exploit

Undefined behavior via unchecked numeric casts

Published Jan 6, 2026 · Updated Jan 6, 2026

Integer conversion errors in iccDEV before 2.3.1.1 allow attackers to trigger undefined behavior when a user processes crafted profile XML. CIccXmlArrayType::ParseText converts text with atof() and casts the resulting double directly to the destination numeric type without checking representable bounds or NaN. Reachability requires IccFromXML or another library consumer to parse attacker-controlled profile XML; published sanitizer evidence confirms invalid conversions, while concrete security outcomes remain undisclosed.

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

Integer conversion errors in iccDEV before 2.3.1.1 allow attackers to trigger undefined behavior when a user processes crafted profile XML. CIccXmlArrayType::ParseText converts text with atof() and casts the resulting double directly to the destination numeric type without checking representable bounds or NaN. Reachability requires IccFromXML or another library consumer to parse attacker-controlled profile XML; published sanitizer evidence confirms invalid conversions, while concrete security outcomes remain undisclosed.

The record

CVE
CVE-2026-21673
Published
Jan 6, 2026
Updated
Jan 6, 2026
Vendor
International Color Consortium
Product
iccDEV
Classifications
CWE-190, CWE-704, CWE-681, 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=< 2.3.1.1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

International Color Consortium · iccDEVversion=< 2.3.1.1

Published CVSS scores

7.8GitHub, Inc.CVSS: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.

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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-190Integer Overflow or Wraparound
CWE-704Incorrect Type Conversion or Cast
CWE-681Incorrect Conversion between Numeric Types
T1204.002Malicious 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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