FFmpeg Heap Out-of-Bounds Write in vf_hqdn3d Filter
FFmpeg through 8.1.2, fixed in commit 5d7112c, contains a heap out-of-bounds write vulnerability in the vf_hqdn3d filter that allows attackers to corrupt heap memory by supplying a crafted video whose frame resolution increases between frames when filtergraph reinitialization is disabled via the -reinit_filter 0 option. Attackers can provide a malicious video input where vf_hqdn3d.config_input() allocates undersized per-plane line-history buffers based on the initial frame width, and subsequent larger frames cause denoise_spatial() to write beyond the allocation boundary, resulting in heap memory corruption.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-66036
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 14:11 UTC · Revision 1
Source evidence
FFmpeg Heap Out-of-Bounds Write in vf_hqdn3d Filter
core-osv · Original sourcePublished 24 Jul 2026, 19:34 UTC
FFmpeg through 8.1.2, fixed in commit 5d7112c, contains a heap out-of-bounds write vulnerability in the vf_hqdn3d filter that allows attackers to corrupt heap memory by supplying a crafted video whose frame resolution increases between frames when filtergraph reinitialization is disabled via the -reinit_filter 0 option. Attackers can provide a malicious video input where vf_hqdn3d.config_input() allocates undersized per-plane line-history buffers based on the initial frame width, and subsequent larger frames cause denoise_spatial() to write beyond the allocation boundary, resulting in heap memory corruption.
osv:CVE-2026-66036
Complete source record
{
"id": "4b25cc637a2088e392feda6b96f8db0642efed1ffda14af917feca775559e77c",
"url": "https://osv.dev/vulnerability/CVE-2026-66036",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "FFmpeg Heap Out-of-Bounds Write in vf_hqdn3d Filter",
"summary": "FFmpeg through 8.1.2, fixed in commit 5d7112c, contains a heap out-of-bounds write vulnerability in the vf_hqdn3d filter that allows attackers to corrupt heap memory by supplying a crafted video whose frame resolution increases between frames when filtergraph reinitialization is disabled via the -reinit_filter 0 option. Attackers can provide a malicious video input where vf_hqdn3d.config_input() allocates undersized per-plane line-history buffers based on the initial frame width, and subsequent larger frames cause denoise_spatial() to write beyond the allocation boundary, resulting in heap memory corruption.",
"evidence": "osv:CVE-2026-66036",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-66036",
"aliases": [
"CVE-2026-66036"
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"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
}
],
"affected": [
{
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"repo": "https://git.ffmpeg.org/ffmpeg.git",
"type": "GIT",
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{
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}
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"cpe": "cpe:2.3:a:ffmpeg:ffmpeg:*:*:*:*:*:*:*:*",
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"N"
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"database_specific": {
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}
}
],
"modified": "2026-10-28T02:30:36.085077554Z",
"provider": "osv",
"references": [
"https://code.ffmpeg.org/FFmpeg/FFmpeg",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/66xxx/CVE-2026-66036.json",
"https://nvd.nist.gov/vuln/detail/CVE-2026-66036",
"https://www.vulncheck.com/advisories/ffmpeg-heap-out-of-bounds-write-in-vf-hqdn3d-filter",
"https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23783",
"https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/5d7112c60e6f0f0742ce47d448e6da0718a70f4c"
],
"provider_metadata": {
"cwe_ids": [
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],
"cna_assigner": "VulnCheck",
"unresolved_ranges": [
{
"extracted_events": [
{
"range": [
{
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}
],
"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
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]
}
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/66xxx/CVE-2026-66036.json"
}
},
"related_cves": [
{
"value": "CVE-2026-66036",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 503510,
"published_at": "2026-07-24T19:34:16.223+00:00"
}