CVE-2026-64830

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Source
https://cve.org/CVERecord?id=CVE-2026-64830
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64830.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-64830
Downstream
Published
2026-07-22T16:33:05.724Z
Modified
2026-08-04T11:51:17.510856270Z
Severity
  • 8.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N CVSS Calculator
Summary
FFmpeg 2.1 - 8.1.2 Heap Buffer Overflow via VobSub Subtitle Demuxer
Details

FFmpeg versions 2.1 through 8.1.2 contains a heap buffer overflow vulnerability in the VobSub subtitle demuxer that allows attackers to corrupt adjacent heap memory by supplying a malicious .sub/.idx subtitle file declaring more distinct stream IDs than the fixed-size array bounds in libavformat/mpeg.c. Attackers can craft a subtitle file with excessive distinct stream IDs to trigger unbounded writes beyond the vobsub->q[] array boundary via ffsubtitlesqueue_insert(), potentially achieving arbitrary code execution in any application using FFmpeg's VobSub demuxer.

Database specific 
{
    "cwe_ids": [
        "CWE-122"
    ],
    "cna_assigner": "VulnCheck",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64830.json",
    "unresolved_ranges": [
        {
            "source": "AFFECTED_FIELD",
            "extracted_events": [
                {
                    "introduced": "2.1"
                },
                {
                    "last_affected": "8.1.2"
                },
                {
                    "introduced": "dbd495f066a85ba96b17433f4306582aa37c3951"
                },
                {
                    "last_affected": "dbd495f066a85ba96b17433f4306582aa37c3951"
                }
            ]
        },
        {
            "source": "CPE_FIELD",
            "extracted_events": [
                {
                    "introduced": "2.1"
                },
                {
                    "last_affected": "8.1.2"
                }
            ]
        },
        {
            "source": "DESCRIPTION",
            "extracted_events": [
                {
                    "introduced": "2.1"
                },
                {
                    "fixed": "8.1.2"
                }
            ]
        }
    ]
}
References

Affected packages

Git / git.ffmpeg.org/ffmpeg.git

Affected ranges

Type
GIT
Repo
https://git.ffmpeg.org/ffmpeg.git
Events
Introduced
a37e42b3ee4226a4d2c69cd4eebf9c81e6df8ea5
Last affected
38b88335f99e76ed89ff3c93f877fdefce736c13
Database specific 
{
    "source": "CPE_RANGE",
    "cpe": "cpe:2.3:a:ffmpeg:ffmpeg:*:*:*:*:*:*:*:*",
    "extracted_events": [
        {
            "introduced": "2.1"
        },
        {
            "last_affected": "8.1.2"
        }
    ]
}

Affected versions

n2.*
n2.1-dev
n2.2-dev
n2.3-dev
n2.4-dev
n2.5-dev
n2.6-dev
n2.7-dev
n2.8-dev
n2.9-dev
n3.*
n3.1-dev
n3.2-dev
n3.3-dev
n3.4-dev
n3.5-dev
n4.*
n4.1-dev
n4.2-dev
n4.3-dev
n4.4-dev
n4.5-dev
n5.*
n5.1-dev
n5.2-dev
n6.*
n6.1-dev
n6.2-dev
n7.*
n7.1-dev
n7.2-dev
n8.*
n8.1
n8.1-dev
n8.1.1
n8.1.2

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64830.json"