CVE-2026-125206 (GCVE-0-2026-125206)

Vulnerability from cvelistv5 – Published: 2026-11-09 19:11 – Updated: 2026-11-09 19:11
VLAI
Title
FFmpeg through 9.0.2 Out-of-Bounds Read via prores_ks Interlaced Alpha Encoding
Summary
FFmpeg through 9.0.2 contains an out-of-bounds read vulnerability in the prores_ks encoder's get_alpha_data() that reads before the blocks buffer for interlaced frames with odd heights. Attackers can supply video with alpha and odd height encoded to interlaced ProRes 4444, causing out-of-bounds memory to be encoded into the output alpha plane.
Severity
2 (Low)
CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
2.5 (Low)
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
CWE
Assigner
VulnCheck CNA
References
Impacted products
Vendor Product Version
FFmpeg FFmpeg Affected: 0 , ≤ 9.0.2 (semver)
    cpe:2.3:a:ffmpeg:ffmpeg:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-09-15 00:00
Credits
Zheng Yu @ Depthfirst Joshua Rogers (AISLE Research) Michael Niedermayer
Show details on NVD website
To clipboard 

{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "packageURL": "pkg:github/ffmpeg/ffmpeg",
          "product": "FFmpeg",
          "repo": "https://code.ffmpeg.org/FFmpeg/FFmpeg",
          "vendor": "FFmpeg",
          "versions": [
            {
              "lessThanOrEqual": "9.0.2",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
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      "cpeApplicability": [
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      ],
      "datePublic": "2026-09-15T00:00:00.000Z",
      "descriptions": [
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          "value": "FFmpeg through 9.0.2 contains an out-of-bounds read vulnerability in the prores_ks encoder\u0027s get_alpha_data() that reads before the blocks buffer for interlaced frames with odd heights. Attackers can supply video with alpha and odd height encoded to interlaced ProRes 4444, causing out-of-bounds memory to be encoded into the output alpha plane."
        }
      ],
      "metrics": [
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            "baseScore": 2,
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            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
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            "confidentialityImpact": "LOW",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N",
            "version": "3.1"
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      "problemTypes": [
        {
          "descriptions": [
            {
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              "description": "Buffer Under-read",
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              "type": "CWE"
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      "providerMetadata": {
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        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
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      "references": [
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          "tags": [
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          "url": "https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/24490"
        },
        {
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        },
        {
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          "url": "https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/proresenc_kostya.c#L150"
        },
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          "tags": [
            "product"
          ],
          "url": "https://github.com/FFmpeg/FFmpeg"
        },
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          "tags": [
            "third-party-advisory"
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          "url": "https://www.vulncheck.com/advisories/ffmpeg-through-9.0.2-out-of-bounds-read-via-prores-ks-interlaced-alpha-encoding"
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      ],
      "title": "FFmpeg through 9.0.2 Out-of-Bounds Read via prores_ks Interlaced Alpha Encoding",
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  "cveMetadata": {
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    "assignerShortName": "VulnCheck",
    "cveId": "CVE-2026-125206",
    "datePublished": "2026-11-09T19:11:24.279Z",
    "dateReserved": "2026-11-09T18:15:13.992Z",
    "dateUpdated": "2026-11-09T19:11:24.279Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}



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