CVE-2026-21507Public exploitNetwork attack vector

Profile-processing hang via zero-length read loop

Published Jan 6, 2026 · Updated Jan 6, 2026

Infinite-loop denial of service in International Color Consortium iccDEV before 2.3.1.1 allows remote attackers to hang profile processing. CalcProfileID keeps its while(len) loop running when CIccIO::Read8 returns zero because len is reduced by zero instead of terminating. Exploitation requires crafted XML profile data to reach iccFromXML or another consumer that invokes profile-ID calculation, consuming CPU and leaving that operation hung.

CVSS severity7.5
High
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Infinite-loop denial of service in International Color Consortium iccDEV before 2.3.1.1 allows remote attackers to hang profile processing. CalcProfileID keeps its while(len) loop running when CIccIO::Read8 returns zero because len is reduced by zero instead of terminating. Exploitation requires crafted XML profile data to reach iccFromXML or another consumer that invokes profile-ID calculation, consuming CPU and leaving that operation hung.

The record

CVE
CVE-2026-21507
Published
Jan 6, 2026
Updated
Jan 6, 2026
Vendor
International Color Consortium
Product
iccDEV
Classifications
CWE-835, T1499.004
Attack vector
network
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

Compare your product and version with the public record. A matching version still requires validation against your environment.

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 vectornetwork
Required privilegesunauthenticated

What is affected?

International Color Consortium · iccDEVversion=< 2.3.1.1

Published CVSS scores

7.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-835Loop with Unreachable Exit Condition ('Infinite Loop')
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo