Security readout for executives and security teams
Plain-English summary
CVE-2026-21691 is a medium-severity bug in iccDEV before 2.3.1.2. It can be triggered when software processes ICC color profiles. A malicious or malformed profile could cause limited integrity or availability impact. Organizations are mainly exposed if they use iccDEV in applications that accept or process externally supplied ICC profiles.
Executive priority
Treat as a targeted patching item, not an emergency. Prioritize environments that process external ICC profiles or expose profile-processing workflows. The business risk is moderate because exploitation requires interaction and impacts are limited, but a vendor patch is available and no workaround is documented.
Technical view
The issue is a type confusion vulnerability in CIccTag:IsTypeCompressed() in International Color Consortium iccDEV versions earlier than 2.3.1.2. The CVSS 3.1 score is 5.4, with network attack vector, low complexity, no privileges, and required user interaction. The vendor advisory states 2.3.1.2 contains the patch and no known workarounds are available.
Likely exposure
Exposure is likely limited to systems or applications that include iccDEV before 2.3.1.2 and process ICC color profiles. Risk is higher where profiles come from users, partners, uploaded files, or other untrusted sources. The provided sources do not identify specific downstream products.
Exploitation context
The CVSS vector indicates exploitation may be possible remotely but requires user interaction. The source bundle does not state active exploitation, and the CVE is not listed as KEV. Public sources provided identify the vulnerable function and patch, but do not establish weaponized exploitation.
Researcher notes
Key evidence is the GitHub advisory, CVE record, linked issue, and pull request. The vulnerability class is type confusion in CIccTag:IsTypeCompressed(). The record maps multiple CWEs, including input validation and null pointer dereference related categories. Details beyond patch availability and affected versions are limited in the provided sources.
Mitigation direction
- Upgrade iccDEV to version 2.3.1.2 or later.
- Prioritize systems processing ICC profiles from untrusted or external sources.
- If immediate upgrade is not possible, check vendor guidance; no workaround is named.
- Reduce acceptance of untrusted ICC profiles where operationally feasible until patched.
Validation and detection
- Inventory applications and services that use iccDEV.
- Confirm deployed iccDEV versions are 2.3.1.2 or later.
- Identify workflows that process externally supplied ICC color profiles.
- Review build manifests or dependency records for bundled vulnerable versions.
- Verify patched deployments through normal release and dependency verification processes.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
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ATT&CK lookup starting points
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CWE-1025: Exact CWE lookup
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Open ATT&CK lookupCWE-140: Exact CWE lookup
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Open ATT&CK lookupCWE-20: Exact CWE lookup
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Open ATT&CK lookupCWE-476: Exact CWE lookup
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Open ATT&CK lookupCWE-697: Exact CWE lookup
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Open ATT&CK lookupCVE-2026-21691 mapping review
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Open ATT&CK lookup- Severity
- Medium
- CVSS
- 5.4 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L2.82.5Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.4MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/InternationalColorConsortium/iccDEV/security/advisories/GHSA-c9q5-x498-jv92CVE reference · x_refsource_CONFIRM
- https://github.com/InternationalColorConsortium/iccDEV/issues/392CVE reference · x_refsource_MISC
- https://github.com/InternationalColorConsortium/iccDEV/pull/426CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.