Vulnerability-Lookup

CNVD-2026-34245

Vulnerability from cnvd - Published: 2026-08-28

Title

FFmpeg缓冲区溢出漏洞（CNVD-2026-34245）

Description

FFmpeg是FFmpeg的一款开源多媒体处理工具。 FFmpeg 4.4至9.0之前版本存在安全漏洞，该漏洞源于CFHD解码器在解析特定格式时存在堆越界写入缺陷。攻击者可利用该漏洞通过提供特制的AVI文件导致堆内存破坏，进而可能实现任意代码执行。

Severity

高

Patch Name

FFmpeg缓冲区溢出漏洞（CNVD-2026-34245）的补丁

Patch Description

FFmpeg是FFmpeg的一款开源多媒体处理工具。 FFmpeg 4.4至9.0之前版本存在安全漏洞，该漏洞源于CFHD解码器在解析特定格式时存在堆越界写入缺陷。攻击者可利用该漏洞通过提供特制的AVI文件导致堆内存破坏，进而可能实现任意代码执行。目前，供应商发布了安全公告及相关补丁信息，修复了此漏洞。

Formal description

目前厂商已经发布了升级补丁以修复这个安全问题，请到厂商的主页下载： https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23898

Reference

https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23898 https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/1006a2151236f9235bf02822f263b3fb0532111e https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/db05df9d135fb56a4babb836d5e9f5c1d984e087 https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/16b2049d4d5222db6cd7c031409058571c94f6a9

Impacted products

Name
FFmpeg FFmpeg >=4.4，<9.0

Show details on source website

JSON

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{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2026-70632",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2026-70632"
    }
  },
  "description": "FFmpeg\u662fFFmpeg\u7684\u4e00\u6b3e\u5f00\u6e90\u591a\u5a92\u4f53\u5904\u7406\u5de5\u5177\u3002\n\nFFmpeg 4.4\u81f39.0\u4e4b\u524d\u7248\u672c\u5b58\u5728\u5b89\u5168\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8eCFHD\u89e3\u7801\u5668\u5728\u89e3\u6790\u7279\u5b9a\u683c\u5f0f\u65f6\u5b58\u5728\u5806\u8d8a\u754c\u5199\u5165\u7f3a\u9677\u3002\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u901a\u8fc7\u63d0\u4f9b\u7279\u5236\u7684AVI\u6587\u4ef6\u5bfc\u81f4\u5806\u5185\u5b58\u7834\u574f\uff0c\u8fdb\u800c\u53ef\u80fd\u5b9e\u73b0\u4efb\u610f\u4ee3\u7801\u6267\u884c\u3002",
  "formalWay": "\u76ee\u524d\u5382\u5546\u5df2\u7ecf\u53d1\u5e03\u4e86\u5347\u7ea7\u8865\u4e01\u4ee5\u4fee\u590d\u8fd9\u4e2a\u5b89\u5168\u95ee\u9898\uff0c\u8bf7\u5230\u5382\u5546\u7684\u4e3b\u9875\u4e0b\u8f7d\uff1a\r\nhttps://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23898",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2026-34245",
  "openTime": "2026-08-28",
  "patchDescription": "FFmpeg\u662fFFmpeg\u7684\u4e00\u6b3e\u5f00\u6e90\u591a\u5a92\u4f53\u5904\u7406\u5de5\u5177\u3002\r\n\r\nFFmpeg 4.4\u81f39.0\u4e4b\u524d\u7248\u672c\u5b58\u5728\u5b89\u5168\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8eCFHD\u89e3\u7801\u5668\u5728\u89e3\u6790\u7279\u5b9a\u683c\u5f0f\u65f6\u5b58\u5728\u5806\u8d8a\u754c\u5199\u5165\u7f3a\u9677\u3002\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u901a\u8fc7\u63d0\u4f9b\u7279\u5236\u7684AVI\u6587\u4ef6\u5bfc\u81f4\u5806\u5185\u5b58\u7834\u574f\uff0c\u8fdb\u800c\u53ef\u80fd\u5b9e\u73b0\u4efb\u610f\u4ee3\u7801\u6267\u884c\u3002\u76ee\u524d\uff0c\u4f9b\u5e94\u5546\u53d1\u5e03\u4e86\u5b89\u5168\u516c\u544a\u53ca\u76f8\u5173\u8865\u4e01\u4fe1\u606f\uff0c\u4fee\u590d\u4e86\u6b64\u6f0f\u6d1e\u3002",
  "patchName": "FFmpeg\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\uff08CNVD-2026-34245\uff09\u7684\u8865\u4e01",
  "products": {
    "product": "FFmpeg FFmpeg \u003e=4.4\uff0c\u003c9.0"
  },
  "referenceLink": "https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23898\r\nhttps://code.ffmpeg.org/FFmpeg/FFmpeg/commit/1006a2151236f9235bf02822f263b3fb0532111e\r\nhttps://code.ffmpeg.org/FFmpeg/FFmpeg/commit/db05df9d135fb56a4babb836d5e9f5c1d984e087\r\nhttps://code.ffmpeg.org/FFmpeg/FFmpeg/commit/16b2049d4d5222db6cd7c031409058571c94f6a9",
  "serverity": "\u9ad8",
  "submitTime": "2026-08-12",
  "title": "FFmpeg\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\uff08CNVD-2026-34245\uff09"
}

CVE-2026-70632 (GCVE-0-2026-70632)

Vulnerability from cvelistv5 – Published: 2026-08-06 21:26 – Updated: 2026-08-14 16:51 X_Open Source

Title

FFmpeg 4.4 < 9.0 Heap Out-of-Bounds Write in CFHD Decoder via AVI Demuxing

Summary

FFmpeg versions from 4.4 up to, but not including, 9.0 contain an out-of-bounds heap write vulnerability in the native GoPro CineForm HD (CFHD) decoder that allows remote attackers to corrupt heap memory by supplying a crafted AVI file during stream probing. The cfhd_decode() function fails to enforce the non-Bayer logical output-width invariant in the transform-type-2 reconstruction path, causing horiz_filter_clip() to write oversized 16-bit sample rows far beyond the allocated output frame buffer, which can be escalated to arbitrary code execution via overwrite of a live cleanup callback pointer.

Severity

8.5 (High)


                        
                          CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-07 17:19 UTC

CWE

CWE-787 - Out-of-bounds Write

Assigner

VulnCheck mitre root

References

5 references

URL	Tags
https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23898	issue-tracking
https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/1006…	related
https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/db05…	patch
https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/16b2…	patch
https://www.vulncheck.com/advisories/ffmpeg-heap-…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
FFmpeg	FFmpeg	Affected: 4.4 , < 9.0 (custom) cpe:2.3:a:ffmpeg:ffmpeg::::::::

Date Public

2026-07-24 00:00

Credits

Adrian Junge (vurlo)

Show details on NVD website

JSON

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-70632",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-07T17:19:36.712402Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-08-07T17:20:24.373Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "packageURL": "pkg:github/FFmpeg/FFmpeg",
          "product": "FFmpeg",
          "repo": "https://code.ffmpeg.org/FFmpeg/FFmpeg",
          "vendor": "FFmpeg",
          "versions": [
            {
              "lessThan": "9.0",
              "status": "affected",
              "version": "4.4",
              "versionType": "custom"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:ffmpeg:ffmpeg:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "9.0",
                  "versionStartIncluding": "4.4",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Adrian Junge (vurlo)"
        }
      ],
      "datePublic": "2026-07-24T00:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "FFmpeg versions from 4.4 up to, but not including, 9.0 contain an out-of-bounds heap write vulnerability in the native GoPro CineForm HD (CFHD) decoder that allows remote attackers to corrupt heap memory by supplying a crafted AVI file during stream probing. The cfhd_decode() function fails to enforce the non-Bayer logical output-width invariant in the transform-type-2 reconstruction path, causing horiz_filter_clip() to write oversized 16-bit sample rows far beyond the allocated output frame buffer, which can be escalated to arbitrary code execution via overwrite of a live cleanup callback pointer."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "LOCAL",
            "baseScore": 8.5,
            "baseSeverity": "HIGH",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "PASSIVE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
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            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "HIGH",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
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          "scenarios": [
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              "lang": "en",
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            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
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      "problemTypes": [
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          "url": "https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23898"
        },
        {
          "name": "Introducing Commit",
          "tags": [
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          ],
          "url": "https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/1006a2151236f9235bf02822f263b3fb0532111e"
        },
        {
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          "tags": [
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          "url": "https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/db05df9d135fb56a4babb836d5e9f5c1d984e087"
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          "tags": [
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        },
        {
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://www.vulncheck.com/advisories/ffmpeg-heap-out-of-bounds-write-in-cfhd-decoder-via-avi-demuxing"
        }
      ],
      "source": {
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      },
      "tags": [
        "x_open-source"
      ],
      "title": "FFmpeg 4.4 \u003c 9.0 Heap Out-of-Bounds Write in CFHD Decoder via AVI Demuxing",
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      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "cveId": "CVE-2026-70632",
    "datePublished": "2026-08-06T21:26:17.466Z",
    "dateReserved": "2026-08-04T20:17:18.297Z",
    "dateUpdated": "2026-08-14T16:51:34.123Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

CNVD-2026-34245

CVE-2026-70632 (GCVE-0-2026-70632)

Tags

Sightings

Nomenclature