Heap out-of-bounds write via wrapped picture allocation
Published Sep 9, 2026 · Updated Sep 9, 2026
Heap out-of-bounds write in VideoLAN VLC media player 3.0.0 through 3.0.23 allows attackers to corrupt memory via a crafted PNG file. AllocatePicture multiplies each plane's signed-int pitch and line count at 32 bits before adding the wrapped product to a size_t total, so aligned_alloc reserves a buffer smaller than the PNG decoder's scanline writes. Opening the file directly or from a playlist is sufficient, requires user interaction and no non-default settings, and allows attacker-influenced data to overwrite heap memory.
Summary
What happened
Heap out-of-bounds write in VideoLAN VLC media player 3.0.0 through 3.0.23 allows attackers to corrupt memory via a crafted PNG file. AllocatePicture multiplies each plane's signed-int pitch and line count at 32 bits before adding the wrapped product to a size_t total, so aligned_alloc reserves a buffer smaller than the PNG decoder's scanline writes. Opening the file directly or from a playlist is sufficient, requires user interaction and no non-default settings, and allows attacker-influenced data to overwrite heap memory.
The record
- CVE
- CVE-2026-56711
- Published
- Sep 9, 2026
- Updated
- Sep 9, 2026
- Vendor
- VideoLAN
- Product
- VLC media player
- Classifications
- CWE-787, CWE-190, T1204.002
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 9, 2026CVE publishedPublication date reported by the CVE source.
- Sep 9, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=3.0.0 <=3.0.23
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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