CVE-2020-36430

libass 0.15.x before 0.15.1 has a heap-based buffer overflow in decode_chars (called from decode_font and process_text) because the wrong integer data type is used for subtraction.

Database specific

{
    "unresolved_ranges":  [
        {
            "cpes":  [
                "cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*"
            ],
            "extracted_events":  [
                {
                    "introduced":  "34"
                },
                {
                    "last_affected":  "34"
                }
            ],
            "source":  "CPE_STRING",
            "vendor_product":  "fedoraproject:fedora"
        }
    ]
}

References

Affected packages

Git / github.com/libass/libass

Affected ranges

Type

GIT

Repo

https://github.com/libass/libass

Events

Introduced

d149636f502f5774ae1a8fb4c554b122674393b2

Fixed

5447214643eacef71776350e779adf4b6c07bb3b

Fixed

017137471d0043e0321e377ed8da48e45a3ec632

Database specific

Show details

{
    "cpe":  "cpe:2.3:a:libass_project:libass:*:*:*:*:*:*:*:*",
    "extracted_events":  [
        {
            "introduced":  "0.15.0"
        },
        {
            "fixed":  "0.15.1"
        }
    ],
    "source":  [
        "CPE_RANGE",
        "REFERENCES"
    ]
}

Affected versions

0.*

0.15.0

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-36430.json"

vanir_signatures

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    {
        "deprecated":  false,
        "digest":  {
            "function_hash":  "110991188393091881186985668039830991525",
            "length":  1124
        },
        "id":  "CVE-2020-36430-1e115502",
        "signature_type":  "Function",
        "signature_version":  "v1",
        "source":  "https://github.com/libass/libass/commit/017137471d0043e0321e377ed8da48e45a3ec632",
        "target":  {
            "file":  "libass/ass.c",
            "function":  "decode_font"
        }
    },
    {
        "deprecated":  false,
        "digest":  {
            "line_hashes":  [
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                "124461199810427598757175082018620638494"
            ],
            "threshold":  0.9
        },
        "id":  "CVE-2020-36430-dd9ed4a7",
        "signature_type":  "Line",
        "signature_version":  "v1",
        "source":  "https://github.com/libass/libass/commit/017137471d0043e0321e377ed8da48e45a3ec632",
        "target":  {
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        }
    }
]

vanir_signatures_modified

"2026-07-08T17:56:24Z"