Vulnerability-Lookup

CNVD-2026-34246

Vulnerability from cnvd - Published: 2026-08-28

Title

Ffmpeg FFmpeg资源管理错误漏洞（CNVD-2026-34246）

Description

FFmpeg是FFmpeg的一款开源多媒体处理工具。 FFmpeg 3.0至9.0之前版本存在未初始化资源的使用漏洞，该漏洞源于原生Screenpresso解码器在解压数据不足时未正确验证输出字节数，导致未初始化的堆内存被复制到解码输出。攻击者可利用该漏洞通过构造特制的SPV1数据包恢复敏感内存内容，可能泄露用户空间地址等敏感信息。

Severity

中

Patch Name

Ffmpeg FFmpeg资源管理错误漏洞（CNVD-2026-34246）的补丁

Patch Description

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/23896

Reference

https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23896 https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/9a3202a98b2e095b54dd784c3e01a09a676fc3fa https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/705890061467ad550ecc1dad5eea07f28ccfb43e https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/c22667d0fd7916a33fd3e79685b7246fc48f1a62

Impacted products

Name
FFmpeg FFmpeg >=3.0，<9.0

Show details on source website

JSON

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{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2026-70630",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2026-70630"
    }
  },
  "description": "FFmpeg\u662fFFmpeg\u7684\u4e00\u6b3e\u5f00\u6e90\u591a\u5a92\u4f53\u5904\u7406\u5de5\u5177\u3002\n\nFFmpeg 3.0\u81f39.0\u4e4b\u524d\u7248\u672c\u5b58\u5728\u672a\u521d\u59cb\u5316\u8d44\u6e90\u7684\u4f7f\u7528\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u539f\u751fScreenpresso\u89e3\u7801\u5668\u5728\u89e3\u538b\u6570\u636e\u4e0d\u8db3\u65f6\u672a\u6b63\u786e\u9a8c\u8bc1\u8f93\u51fa\u5b57\u8282\u6570\uff0c\u5bfc\u81f4\u672a\u521d\u59cb\u5316\u7684\u5806\u5185\u5b58\u88ab\u590d\u5236\u5230\u89e3\u7801\u8f93\u51fa\u3002\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u901a\u8fc7\u6784\u9020\u7279\u5236\u7684SPV1\u6570\u636e\u5305\u6062\u590d\u654f\u611f\u5185\u5b58\u5185\u5bb9\uff0c\u53ef\u80fd\u6cc4\u9732\u7528\u6237\u7a7a\u95f4\u5730\u5740\u7b49\u654f\u611f\u4fe1\u606f\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/23896",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2026-34246",
  "openTime": "2026-08-28",
  "patchDescription": "FFmpeg\u662fFFmpeg\u7684\u4e00\u6b3e\u5f00\u6e90\u591a\u5a92\u4f53\u5904\u7406\u5de5\u5177\u3002\r\n\r\nFFmpeg 3.0\u81f39.0\u4e4b\u524d\u7248\u672c\u5b58\u5728\u672a\u521d\u59cb\u5316\u8d44\u6e90\u7684\u4f7f\u7528\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u539f\u751fScreenpresso\u89e3\u7801\u5668\u5728\u89e3\u538b\u6570\u636e\u4e0d\u8db3\u65f6\u672a\u6b63\u786e\u9a8c\u8bc1\u8f93\u51fa\u5b57\u8282\u6570\uff0c\u5bfc\u81f4\u672a\u521d\u59cb\u5316\u7684\u5806\u5185\u5b58\u88ab\u590d\u5236\u5230\u89e3\u7801\u8f93\u51fa\u3002\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u901a\u8fc7\u6784\u9020\u7279\u5236\u7684SPV1\u6570\u636e\u5305\u6062\u590d\u654f\u611f\u5185\u5b58\u5185\u5bb9\uff0c\u53ef\u80fd\u6cc4\u9732\u7528\u6237\u7a7a\u95f4\u5730\u5740\u7b49\u654f\u611f\u4fe1\u606f\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 FFmpeg\u8d44\u6e90\u7ba1\u7406\u9519\u8bef\u6f0f\u6d1e\uff08CNVD-2026-34246\uff09\u7684\u8865\u4e01",
  "products": {
    "product": "FFmpeg FFmpeg \u003e=3.0\uff0c\u003c9.0"
  },
  "referenceLink": "https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23896\r\nhttps://code.ffmpeg.org/FFmpeg/FFmpeg/commit/9a3202a98b2e095b54dd784c3e01a09a676fc3fa\r\nhttps://code.ffmpeg.org/FFmpeg/FFmpeg/commit/705890061467ad550ecc1dad5eea07f28ccfb43e\r\nhttps://code.ffmpeg.org/FFmpeg/FFmpeg/commit/c22667d0fd7916a33fd3e79685b7246fc48f1a62",
  "serverity": "\u4e2d",
  "submitTime": "2026-08-12",
  "title": "Ffmpeg FFmpeg\u8d44\u6e90\u7ba1\u7406\u9519\u8bef\u6f0f\u6d1e\uff08CNVD-2026-34246\uff09"
}

CVE-2026-70630 (GCVE-0-2026-70630)

Vulnerability from cvelistv5 – Published: 2026-08-06 21:25 – Updated: 2026-08-14 16:51 X_Open Source

Title

FFmpeg 3.0 < 9.0 Uninitialized Heap Memory Read in Screenpresso Decoder

Summary

FFmpeg versions from 3.0 up to, but not including, 9.0 contain an uninitialized heap memory read vulnerability in the native Screenpresso decoder (libavcodec/screenpresso.c) that allows attackers to recover sensitive memory contents by supplying a crafted SPV1 packet with a valid zlib stream that decompresses fewer bytes than the full frame requires. The screenpresso_decode_frame() function fails to validate the produced byte count before calling av_image_copy_plane() to copy the complete frame dimensions from the persistent ctx->inflated_buf buffer, causing unwritten heap memory from prior allocations or prior frames to be copied into decoded output and potentially exposing sensitive data such as userspace addresses from persistent decoding services.

Severity

6.8 (Medium)


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

5.5 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-07 17:09 UTC

CWE

CWE-908 - Use of Uninitialized Resource

Assigner

VulnCheck mitre root

References

5 references

URL	Tags
https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23896	issue-tracking
https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/9a32…	related
https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/7058…	patch
https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/c226…	patch
https://www.vulncheck.com/advisories/ffmpeg-unini…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
FFmpeg	FFmpeg	Affected: 3.0 , < 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-2026-70630",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-07T17:09:51.127288Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-08-07T17:10:05.183Z",
          "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": "3.0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:ffmpeg:ffmpeg:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "9.0",
                  "versionStartIncluding": "3.0",
                  "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 3.0 up to, but not including, 9.0 contain an uninitialized heap memory read vulnerability in the native Screenpresso decoder (libavcodec/screenpresso.c) that allows attackers to recover sensitive memory contents by supplying a crafted SPV1 packet with a valid zlib stream that decompresses fewer bytes than the full frame requires. The screenpresso_decode_frame() function fails to validate the produced byte count before calling av_image_copy_plane() to copy the complete frame dimensions from the persistent ctx-\u003einflated_buf buffer, causing unwritten heap memory from prior allocations or prior frames to be copied into decoded output and potentially exposing sensitive data such as userspace addresses from persistent decoding services."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "LOCAL",
            "baseScore": 6.8,
            "baseSeverity": "MEDIUM",
            "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:N/VA:N/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "NONE",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
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            "attackVector": "LOCAL",
            "availabilityImpact": "NONE",
            "baseScore": 5.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N",
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          "format": "CVSS",
          "scenarios": [
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          "url": "https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23896"
        },
        {
          "name": "Introducing Commit",
          "tags": [
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        },
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        },
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          "tags": [
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          "url": "https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/c22667d0fd7916a33fd3e79685b7246fc48f1a62"
        },
        {
          "tags": [
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          "url": "https://www.vulncheck.com/advisories/ffmpeg-uninitialized-heap-memory-read-in-screenpresso-decoder"
        }
      ],
      "source": {
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      },
      "tags": [
        "x_open-source"
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      "title": "FFmpeg 3.0 \u003c 9.0 Uninitialized Heap Memory Read in Screenpresso Decoder",
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        "engine": "vulncheck"
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  },
  "cveMetadata": {
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    "assignerShortName": "VulnCheck",
    "cveId": "CVE-2026-70630",
    "datePublished": "2026-08-06T21:25:31.402Z",
    "dateReserved": "2026-08-04T20:17:18.297Z",
    "dateUpdated": "2026-08-14T16:51:32.804Z",
    "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-2026-34246

CVE-2026-70630 (GCVE-0-2026-70630)

Tags

Sightings

Nomenclature