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gdk-pixbuf CVE-2026-16768

| EUVDEUVD-2026-48315 MEDIUM
Out-of-bounds Read (CWE-125)
2026-07-23 redhat GHSA-744w-9fjj-p376
5.3
CVSS 3.1 · Vendor: redhat
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Severity by source

Vendor (redhat) PRIMARY
5.3 MEDIUM
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
vuln.today AI
5.3 MEDIUM

Network vector confirmed for server-side thumbnail pipelines; PR:N because no auth is required to submit an image; C:L reflects partial, indirectly encoded heap disclosure with no integrity or availability impact.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
SUSE
5.5 MEDIUM
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Red Hat
5.3 MEDIUM
qualitative

Primary rating from Vendor (redhat).

CVSS VectorVendor: redhat

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

Lifecycle Timeline

2
Analysis Generated
Jul 23, 2026 - 17:19 vuln.today
CVE Published
Jul 23, 2026 - 16:41 cve.org
MEDIUM 5.3

DescriptionCVE.org

A flaw was found in gdk-pixbuf. When parsing a specially crafted ICO file with pixel values that exceed the defined palette range, an out-of-bounds read can occur due to improper bounds checking against the actual palette size. This vulnerability causes heap bytes to be interpreted as valid palette indices and rendered as RGB pixel values in the output image, allowing an attacker to extract heap content via the generated output, such as a thumbnail.

AnalysisAI

Out-of-bounds heap read in gdk-pixbuf's ICO parser exposes heap memory content through rendered image output, affecting Red Hat Enterprise Linux 6 through 10. When processing a crafted ICO file whose pixel indices exceed the defined palette size, the library reads beyond the palette array boundary - heap bytes are treated as palette entries and rendered as RGB pixel values in the output image, enabling an attacker to extract heap content by analyzing the rendered result. No public exploit has been identified at time of analysis and the vulnerability is not listed in CISA KEV, but server-side image processing pipelines that return rendered output to untrusted callers represent a realistic exposure path.

Technical ContextAI

gdk-pixbuf is the canonical GNOME image decoding library, consumed by GTK applications, desktop file managers, email clients, and server-side thumbnail generation services across Linux environments. ICO files support palette-based (indexed color) encoding where each pixel stores an integer index into a fixed-size color lookup table (palette). CWE-125 (Out-of-bounds Read) identifies the root cause: the ICO loader fails to validate that pixel index values are within the bounds of the actual palette array length before dereferencing it. When an attacker supplies an index larger than the palette size, the read operation advances into adjacent heap memory and treats those arbitrary bytes as RGB color components. The affected library is distributed as part of Red Hat Enterprise Linux 6, 7, 8, 9, and 10 (CPE: cpe:2.3:a:red_hat:red_hat_enterprise_linux_*). The upstream bug is tracked at the GNOME GitLab project (issue #302).

RemediationAI

Apply the gdk-pixbuf errata update from Red Hat once published via the standard Red Hat subscription channels; monitor https://access.redhat.com/security/cve/CVE-2026-16768 and https://bugzilla.redhat.com/show_bug.cgi?id=2506437 for patch release status, as no exact patched version number is confirmed from available data at time of analysis. As a targeted compensating control, disable the ICO image format loader in gdk-pixbuf by removing or commenting out the ICO entry from the loaders.cache file (typically at /usr/lib64/gdk-pixbuf-2.0/2.10.0/loaders.cache); this prevents ICO parsing entirely but will break ICO rendering for legitimate desktop and application use cases. For server-side thumbnail pipelines, restrict the service to a sandboxed process (e.g., systemd DynamicUser, seccomp, or container isolation) so that heap disclosure from the rendering process does not expose sensitive application memory. If ICO support is not required by the application, filtering and rejecting ICO MIME types at upload ingestion boundaries eliminates the attack surface with no functional trade-off for non-ICO workflows.

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise Desktop 15 SP7 Not-Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Not-Affected
SUSE Linux Enterprise Micro 5.3 Affected

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CVE-2026-16768 vulnerability details – vuln.today

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