CVE-2021-30027

mdanalyzeline in md4c.c in md4c 0.4.7 allows attackers to trigger use of uninitialized memory, and cause a denial of service via a malformed Markdown document.

References

Affected packages

Git / github.com/mity/md4c

Affected ranges

Type

GIT

Repo

https://github.com/mity/md4c

Events

Introduced

aa63198b80f999effed125b55ac16d1cbc9ab21c

Last affected

aa63198b80f999effed125b55ac16d1cbc9ab21c

Fixed

4fc808d8fe8d8904f8525bb4231d854f45e23a19

Database specific

Show details

{
    "cpe": "cpe:2.3:a:md4c_project:md4c:0.4.7:*:*:*:*:*:*:*",
    "extracted_events": [
        {
            "introduced": "0.4.7"
        },
        {
            "last_affected": "0.4.7"
        }
    ],
    "source": [
        "CPE_STRING",
        "REFERENCES"
    ]
}

Affected versions

0.*

0.4.7

release-0.*

release-0.4.7

Database specific

vanir_signatures_modified

"2026-07-09T00:14:00Z"

vanir_signatures

[
    {
        "id": "CVE-2021-30027-aafeb3c5",
        "deprecated": false,
        "signature_type": "Function",
        "signature_version": "v1",
        "digest": {
            "length": 10908.0,
            "function_hash": "322245608022275724480425469479335526165"
        },
        "source": "https://github.com/mity/md4c/commit/4fc808d8fe8d8904f8525bb4231d854f45e23a19",
        "target": {
            "function": "md_analyze_line",
            "file": "src/md4c.c"
        }
    },
    {
        "id": "CVE-2021-30027-f3156ffc",
        "deprecated": false,
        "signature_type": "Line",
        "signature_version": "v1",
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "128530702601737101811727024586890550753",
                "98473776384372157529680730225100509720",
                "282087636836527325486394792471415280100",
                "313970169583545866153292837680168776702",
                "283521056716158467520872169441972465266",
                "321152261436292213196061633460465514572",
                "199537899354753774750169400073557411872",
                "202499592155105600623179137581181437845",
                "174112236338003714963880316886125584952",
                "64528996485019690033480507456819749288",
                "40781584929695501939010212285647372006",
                "211144263441560594281229750485882864073",
                "108532761455042207769192576660881309813",
                "301004014917007072830086453236187746024",
                "159215856006652495965340164355596265201",
                "338671760556097010649039124482390622635",
                "310442026149672368764116397330189875207",
                "247800360932106444803672585103536412825",
                "174798969617264694913491682126884538618",
                "81105429030443539012110219833419686059",
                "34773241901086520411897294352802850480",
                "216350882354716231614067117431856901232",
                "214563497792942822017538392314037574131",
                "274558718265672796844056938807883132573",
                "82345420663438109749465528145197249249",
                "306622871234171740882970515189805638101",
                "186240891863141040798060690227249672488",
                "181478689956031745429399673169121431810",
                "202559148123131947237765628721083981518",
                "255237651156812476656622229190067102892"
            ]
        },
        "source": "https://github.com/mity/md4c/commit/4fc808d8fe8d8904f8525bb4231d854f45e23a19",
        "target": {
            "file": "src/md4c.c"
        }
    }
]

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-30027.json"