CVE-2026-56711
Description
A flaw was found in VLC media player. An integer overflow vulnerability exists when computing the size of a picture buffer, specifically in the AllocatePicture function. A remote attacker could exploit this by providing a specially crafted Portable Network Graphics (PNG) image file with large width and height dimensions. This leads to an undersized memory allocation, allowing the decoder to write past the end of the allocated buffer. This heap out-of-bounds write can result in arbitrary code execution.
Statement
Red Hat does not ship VLC media player in any Red Hat product. VLC is available in Fedora and EPEL community repositories and is affected in versions 3.0.0 through 3.0.23.
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)
Integrity
Technical Impact: Modify Memory; Execute Unauthorized Code or Commands
Write operations could cause memory corruption. In some cases, an adversary can modify control data such as return addresses in order to execute unexpected code.
Availability
Technical Impact: DoS: Crash, Exit, or Restart
Attempting to access out-of-range, invalid, or unauthorized memory could cause the product to crash.
Other
Technical Impact: Unexpected State
Subsequent write operations can produce undefined or unexpected results.
Frequently Asked Questions
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