High [CVE-2026-56711] VLC media player: Arbitrary code execution via integer overflow in picture allocation
This high-severity Red Hat Linux advisory covers CVE-2026-56711.
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Summary
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. VLC is available in Fedora and EPEL community repositories and is affected in versions 3.0.0 through 3.0.23.
Red Hat severity: Important — CVSS 8.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H). Weakness: CWE-787.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Mitigation checklist
- 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.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
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