Security readout for executives and security teams
Plain-English summary
CVE-2026-21685 affects iccDEV, a library used to handle ICC color profiles. A malformed profile can trigger undefined behavior when processed. Business impact is mainly service disruption, with limited integrity impact. The vendor patched this in version 2.3.1.2 and states there are no known workarounds.
Executive priority
Treat as a high-priority patch for products or workflows that process external ICC profiles. The main concern is availability disruption. Prioritize internet-facing, customer-facing, or automated file-processing environments. If iccDEV is not present, no action is indicated beyond normal dependency verification.
Technical view
Versions of InternationalColorConsortium iccDEV before 2.3.1.2 contain undefined behavior in CIccTagLut16::Read() while reading ICC profile data. The CVSS 3.1 score is 7.1, with network attack vector, low complexity, no privileges, and required user interaction. Listed weaknesses are CWE-20 and CWE-758.
Likely exposure
Exposure is likely where iccDEV is embedded in applications, services, pipelines, or tools that process ICC color profiles, especially files supplied by users or external partners. Systems not using iccDEV, or not processing ICC profiles, are not indicated as affected by the provided sources.
Exploitation context
The CVSS vector indicates exploitation requires a user or workflow to process a crafted ICC profile. The sources do not report active exploitation, and the CVE is not marked as KEV. Public issue and pull request references exist, but no weaponized exploitation status is established in the provided evidence.
Researcher notes
Evidence is limited to the CVE record, GitHub advisory, issue, and pull request. The root cause is undefined behavior in CIccTagLut16::Read(). The advisory names a fixed version and says no workarounds are available. Avoid assuming impact beyond the published CVSS confidentiality, integrity, and availability ratings.
Mitigation direction
- Upgrade iccDEV to version 2.3.1.2 or later.
- Prioritize systems that process untrusted or externally supplied ICC profiles.
- If immediate upgrade is impossible, check vendor guidance; no workaround is listed.
- Review downstream applications that bundle or statically link iccDEV.
Validation and detection
- Inventory applications and build dependencies for iccDEV usage.
- Confirm deployed iccDEV versions are 2.3.1.2 or later.
- Check SBOMs, package manifests, and vendor-supplied components.
- Identify workflows that accept ICC profiles from external sources.
- Verify remediation through dependency scans or application owner attestation.
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
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-758: 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-2026-21685 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
- 7.1 (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: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:N/I:L/A:H2.84.2Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.1HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/InternationalColorConsortium/iccDEV/security/advisories/GHSA-c3xr-6687-5c8pCVE reference · x_refsource_CONFIRM
- https://github.com/InternationalColorConsortium/iccDEV/issues/213CVE reference · x_refsource_MISC
- https://github.com/InternationalColorConsortium/iccDEV/pull/223CVE 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.
Reliance on Undefined, Unspecified, or Implementation-Defined Behavior
Reliance on Undefined, Unspecified, or Implementation-Defined Behavior represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.