Security readout for executives and security teams
Plain-English summary
CVE-2026-21491 affects iccDEV, a library and toolset for handling ICC color profiles. If a user or application processes a specially crafted profile with vulnerable versions, it can trigger a Unicode buffer overflow. The main business risk is application crash or service disruption, with limited confidentiality impact. A patched version, 2.3.1.2, is available.
Executive priority
Treat as a scheduled but timely remediation item. Prioritize teams handling external images, documents, print assets, or color-management pipelines. The vulnerability can affect availability, but the available evidence does not indicate remote, unauthenticated network exploitation or active exploitation.
Technical view
Versions of International Color Consortium iccDEV before 2.3.1.2 contain a Unicode buffer overflow in CIccTagTextDescription when processing ICC profiles. The CVSS 3.1 score is 6.1 with local attack vector, low complexity, no privileges, and user interaction required. Reported weakness classes include heap overflow, out-of-bounds read, and off-by-one error.
Likely exposure
Exposure is most likely where iccDEV libraries or tools process ICC color profiles from users, partners, file uploads, documents, images, or automated media workflows. Systems not using iccDEV, or not processing untrusted ICC profiles, are less likely exposed.
Exploitation context
The available sources do not state active exploitation, and this CVE is not marked as CISA KEV in the provided bundle. Exploitation requires a vulnerable iccDEV version and processing of a malicious ICC profile, with user interaction indicated by the CVSS vector.
Researcher notes
The advisory attributes the issue to CIccTagTextDescription Unicode handling before 2.3.1.2. The CVSS vector indicates local attack vector and required user interaction. Public sources name commits associated with the fix, but this assessment does not infer additional affected products beyond iccDEV.
Mitigation direction
- Upgrade iccDEV to version 2.3.1.2 or later.
- Identify applications and workflows that bundle or link iccDEV.
- Restrict processing of untrusted ICC profiles until patched.
- Check vendor advisory for any updated guidance.
- Prioritize patching systems that ingest external media files.
Validation and detection
- Confirm installed or bundled iccDEV versions are 2.3.1.2 or later.
- Review software bills of materials for iccDEV dependencies.
- Inventory workflows that process ICC color profiles.
- Check whether profile inputs originate from untrusted sources.
- Verify deployed builds include the referenced upstream fixes.
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
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-122: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCWE-125: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCWE-193: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-21491 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
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:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H1.84.2Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.1MediumVector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/InternationalColorConsortium/iccDEV/security/advisories/GHSA-4pv4-4x2x-6j88CVE reference · x_refsource_CONFIRM
- https://github.com/InternationalColorConsortium/iccDEV/issues/396CVE reference · x_refsource_MISC
- https://github.com/InternationalColorConsortium/iccDEV/commit/7c2cb719a9de1c00844e457e070d657314383ee3CVE reference · x_refsource_MISC
- https://github.com/InternationalColorConsortium/iccDEV/commit/e91fe722ac54ce497d410153e7405090e0565d7bCVE 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.
Heap-based Buffer Overflow
Heap-based Buffer Overflow represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.
Out-of-bounds Read
Out-of-bounds Read represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.
Off-by-one Error
Off-by-one Error represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.