Security readout for executives and security teams
Plain-English summary
CVE-2026-21679 affects iccDEV, a library and toolset for ICC color profile processing. Versions before 2.3.1.2 can overflow heap memory when handling localized Unicode text in a profile. If your software processes untrusted ICC profiles, this could create confidentiality, integrity, and availability risk. A patched version is available.
Executive priority
Prioritize remediation for products, services, or workflows that accept externally supplied image, document, print, or color-profile content. The issue is high severity with broad impact potential, but current sources do not confirm active exploitation.
Technical view
The issue is a heap-buffer-overflow in CIccLocalizedUnicode::GetText() in InternationalColorConsortium iccDEV before 2.3.1.2. The CVSS 3.1 score is 8.8, vector AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H. The CVE lists CWE-20. The upstream advisory states the issue is fixed in version 2.3.1.2.
Likely exposure
Exposure is most likely where iccDEV libraries or tools process ICC color profiles from users, partners, files, uploads, email, documents, or web content. Systems using iccDEV only on trusted internal profiles have lower practical exposure, but should still update.
Exploitation context
The CVSS vector indicates low attack complexity, no privileges required, and user interaction required. The source bundle does not show CISA KEV listing or active exploitation. Public references include an advisory, issue, pull request, and fix commit, but no cited source confirms in-the-wild exploitation.
Researcher notes
Focus triage on code paths invoking CIccLocalizedUnicode::GetText() during ICC profile parsing. Validate whether iccDEV is embedded in downstream products. The public fix commit and pull request are useful for patch verification, but avoid assuming exploitability beyond the stated CVSS and advisory facts.
Mitigation direction
- Upgrade iccDEV to version 2.3.1.2 or later.
- Identify applications bundling or statically linking iccDEV.
- Limit processing of untrusted ICC profiles until patched.
- Monitor the upstream advisory for any additional vendor guidance.
Validation and detection
- Check deployed iccDEV versions are 2.3.1.2 or later.
- Review SBOMs and dependency manifests for iccDEV usage.
- Confirm applications that parse ICC profiles use the patched library.
- Verify update completion in build pipelines and packaged artifacts.
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-20: Exact CWE lookup
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Open ATT&CK lookupCVE-2026-21679 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
- High
- CVSS
- 8.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/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:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H2.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.8HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/InternationalColorConsortium/iccDEV/security/advisories/GHSA-h4wg-473g-p5wcCVE reference · x_refsource_CONFIRM
- https://github.com/InternationalColorConsortium/iccDEV/issues/328CVE reference · x_refsource_MISC
- https://github.com/InternationalColorConsortium/iccDEV/pull/329CVE reference · x_refsource_MISC
- https://github.com/InternationalColorConsortium/iccDEV/commit/2eb25ab95f0db7664ec3850390b6f89e302e7039CVE 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.
Improper Input Validation
Improper Input Validation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.