CVE-2026-106062: GIMP DDS Loader Buffer Overflow Vulnerability

CVE-2026-106062 Overview

CVE-2026-106062 is a heap-based buffer overflow in the GNU Image Manipulation Program (GIMP) DirectDraw Surface (DDS) image loader. The loader computes buffer sizes from the width, height, and pitch fields of a DDS file using 32-bit arithmetic that can overflow. When the resulting undersized buffer receives pixel data written through the Generic Graphics Library (GEGL), heap memory outside the allocation is corrupted. An attacker who convinces a user to open a crafted DDS file can trigger memory corruption and, in the worst case, achieve arbitrary code execution in the context of the GIMP process. The flaw combines an integer overflow [CWE-190] with an out-of-bounds write [CWE-787], tracked under [CWE-119].

Critical Impact
A crafted DDS image can corrupt the heap and execute arbitrary code in the context of the user running GIMP.

Affected Products

GIMP (GNU Image Manipulation Program) DDS loader plug-in
GIMP distributions shipped by Red Hat (see Red Hat Advisory)
Downstream Linux distributions packaging the vulnerable GIMP DDS loader

Discovery Timeline

2026-10-06 - CVE-2026-106062 published to NVD
2026-10-07 - Last updated in NVD database

Technical Details for CVE-2026-106062

Vulnerability Analysis

The vulnerability resides in GIMP's DDS file-format loader, which parses attacker-controlled header fields and allocates a heap buffer to hold decoded pixel data. The loader derives the allocation size from the width, height, and pitch values declared in the DDS header. Because the arithmetic is performed with 32-bit integers, a crafted combination of these values wraps around and produces a value far smaller than the actual pixel payload.

GIMP then streams decoded pixel data into the undersized buffer through GEGL, writing past the end of the allocation. The adjacent heap metadata and neighboring chunks can be corrupted, which may be shaped by an attacker into control-flow hijack primitives. Exploitation requires local user interaction, specifically opening a malicious DDS file in GIMP.

Root Cause

The root cause is unchecked 32-bit integer arithmetic in the DDS loader's size calculation. The product width * height * bytes_per_pixel, or a related computation involving pitch, overflows a uint32_t and yields a small allocation. There is no post-multiplication overflow check and no use of a widened type such as size_t or uint64_t before the result is handed to the allocator.

Attack Vector

Exploitation requires an attacker to deliver a crafted .dds file and persuade a local user to open it in GIMP. The attack surface is local with user interaction, but the delivery mechanism can be remote through email attachments, file-sharing links, or compromised asset repositories. Successful exploitation grants code execution with the privileges of the GIMP user, which can then be used for lateral movement or persistence.

No verified proof-of-concept exploit code has been published. Technical details describing the corrupt header fields and the undersized allocation are available in the referenced Red Hat Bugzilla entry.

Detection Methods for CVE-2026-106062

Indicators of Compromise

GIMP process crashes with SIGSEGV or SIGABRT shortly after opening a .dds file
Unexpected child processes spawned by gimp or gimp-console (for example shells, interpreters, or network tools)
.dds files received from untrusted sources, especially with abnormally large declared width, height, or pitch fields
Heap corruption traces reported by glibc (for example malloc(): corrupted top size) tied to GIMP sessions

Detection Strategies

Hunt for GIMP process executions followed by anomalous child processes or outbound network connections.
Parse DDS headers at the mail or web gateway and flag files whose width * height * bpp overflows 32 bits.
Alert on GIMP crash dumps correlated with recent file-open events to surface attempted exploitation.
Monitor execution of GIMP binaries from directories that normally only hold user documents or temporary files.

Monitoring Recommendations

Centralize endpoint telemetry for process creation, file access, and crash events on workstations where GIMP is installed.
Collect and retain coredumpctl or systemd-coredump artifacts from GIMP crashes for forensic review.
Track installed GIMP package versions across the fleet and alert on hosts running unpatched builds.

How to Mitigate CVE-2026-106062

Immediate Actions Required

Inventory all endpoints with GIMP installed and prioritize patching based on exposure to externally sourced image files.
Instruct users not to open .dds files from untrusted or unexpected sources until the patch is applied.
Block or quarantine inbound .dds attachments at email and web gateways where feasible.
Review process-execution telemetry for signs of exploitation attempts prior to patch deployment.

Patch Information

At the time of publication, refer to the Red Hat CVE-2026-106062 Advisory and the upstream GIMP project for fixed package versions. The fix is expected to widen the DDS size arithmetic to size_t or uint64_t and reject headers whose dimensions would produce an undersized allocation. Downstream distributions should rebuild and ship the corrected GIMP package through their standard update channels.

Workarounds

Disable or remove the DDS loader plug-in from the GIMP plug-ins directory if DDS support is not required.
Open untrusted DDS files only inside a sandboxed environment such as a disposable container or virtual machine.
Restrict GIMP execution to standard user accounts and avoid running it with elevated privileges.
Apply AppArmor or SELinux confinement to the GIMP process to limit the blast radius of successful exploitation.

bash

# Configuration example: remove the DDS loader plug-in as a temporary workaround
sudo rm -f /usr/lib64/gimp/2.0/plug-ins/dds/dds
# Verify DDS files are no longer loaded by GIMP
gimp --version && gimp --no-splash --batch='(quit 0)'