CVE-2021-40565

A Segmentation fault caused by a null pointer dereference vulnerability exists in Gpac through 1.0.1 via the gfavcparsenalu function in avparsers.c when using mp4box, which causes a denial of service.

Database specific

{
    "unresolved_ranges": [
        {
            "cpes": [
                "cpe:2.3:a:gpac:gpac:*:*:*:*:*:*:*:*"
            ],
            "vendor_product": "gpac:gpac",
            "extracted_events": [
                {
                    "last_affected": "1.0.1"
                }
            ],
            "source": "CPE_RANGE"
        },
        {
            "extracted_events": [
                {
                    "fixed": "1.0.1"
                }
            ],
            "source": "DESCRIPTION"
        }
    ]
}

References

Affected packages

Git / github.com/gpac/gpac

Affected ranges

Type

GIT

Repo

https://github.com/gpac/gpac

Events

Introduced

Fixed

893fb99b606eebfae46cde151846a980e689039b

Database specific

Show details

{
    "source": "REFERENCES"
}

Affected versions

v0.*

v0.5.2

v0.6.0

v0.9.0

v0.9.0-preview

v1.*

v1.0.0

Database specific

vanir_signatures

[
    {
        "id": "CVE-2021-40565-23cf188a",
        "deprecated": false,
        "digest": {
            "length": 4132.0,
            "function_hash": "335139963073710083307518464564153621026"
        },
        "signature_version": "v1",
        "target": {
            "file": "src/media_tools/av_parsers.c",
            "function": "gf_avc_parse_nalu"
        },
        "source": "https://github.com/gpac/gpac/commit/893fb99b606eebfae46cde151846a980e689039b",
        "signature_type": "Function"
    },
    {
        "id": "CVE-2021-40565-5f5519ab",
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "153580916275024851464425229044186991413",
                "89277541988750827498244866193382836173",
                "58821412537713668385346327648233806553",
                "48322499738277173370318441782040572189"
            ],
            "threshold": 0.9
        },
        "signature_version": "v1",
        "target": {
            "file": "src/media_tools/av_parsers.c"
        },
        "source": "https://github.com/gpac/gpac/commit/893fb99b606eebfae46cde151846a980e689039b",
        "signature_type": "Line"
    }
]

source

"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2021-40565.json"

vanir_signatures_modified

"2026-08-03T14:35:18Z"