CVE-2026-33023
Description
A flaw was found in libsixel, specifically when it is built with the gdk-pixbuf2 option. A remote attacker can exploit a use-after-free vulnerability by supplying a crafted image, which can lead to information disclosure, memory corruption, or arbitrary code execution.
Statement
An Important use-after-free flaw exists in libsixel when compiled with the gdk-pixbuf2 option. This vulnerability can be triggered by processing a specially crafted image, potentially leading to information disclosure, memory corruption, or arbitrary code execution in affected Red Hat products that utilize this specific build configuration.
Mitigation
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Understanding the Weakness (CWE)
Confidentiality
Technical Impact: Read Memory
If the expired pointer is used in a read operation, an attacker might be able to control data read in by the application.
Availability
Technical Impact: DoS: Crash, Exit, or Restart
If the expired pointer references a memory location that is not accessible to the product, or points to a location that is "malformed" (such as NULL) or larger than expected by a read or write operation, then a crash may occur.
Integrity,Confidentiality,Availability
Technical Impact: Execute Unauthorized Code or Commands
If the expired pointer is used in a function call, or points to unexpected data in a write operation, then code execution may be possible.
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