# CVE-2026-66759: Gimp: out-of-bounds read in file-icns plugin causes information disclosure or crash on crafted icns images

Status: published. Published: 2026-07-27. Updated: 2026-11-05.

A flaw was found in the file-icns plugin in GIMP. When applying a decompressed mask during ICNS image processing, the plugin reads from the mask data buffer without verifying if the cursor exceeds the allocated resource size. If a crafted file contains a truncated mask resource, the icns_decompress function continues reading past the bounds of the buffer. This out-of-bounds read vulnerability results in information disclosure of heap contents, where memory contents are leaked as alpha channel pixel values, or a crash leading to a denial of service if unmapped memory is accessed.

## Remediation

- workaround: To mitigate this vulnerability, do not open ICNS files from untrusted sources with GIMP. (source: CNA: redhat)

## Affected products and versions

- GNOME / GIMP (gimp): ≥ 2.99.14; < * (affected, semver). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (gimp): ≥ 2:3.0.4-4.el9_8.9; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 6 (gimp): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 7 (gimp): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (gimp:2.8/gimp): Version range not reported. Source: CNA: redhat

## Severity and prioritization

- CVSS 3.1: 7.1 (high); CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H; source: CNA: redhat

- CISA KEV: No listing in collected sources

- EPSS: 0.30% as of 2026-11-05; percentile 23.45%

- SSVC: exploitation poc; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-125

## Exploit evidence

- exploit: https://gitlab.gnome.org/GNOME/gimp/-/issues/16528 (ADP: CISA-ADP)

## References

- https://access.redhat.com/errata/RHSA-2026:50817 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/security/cve/CVE-2026-66759 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2507557 (CNA: redhat; issue-tracking, x_refsource_REDHAT)

- https://gitlab.gnome.org/GNOME/gimp/-/issues/16528 (CNA: redhat)

- https://gitlab.gnome.org/GNOME/gimp/-/issues/16528 (ADP: CISA-ADP; exploit)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2026-66759; retrieved 2026-11-05; source updated 2026-11-05

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-66759; retrieved 2026-11-05; source updated Not reported

Revision: e7201952e67a09d58f596bbf2122885d0434b871c82e9b20b3ea0f3d7a8b4b29

Canonical: https://y2.dev/cve/CVE-2026-66759

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