CVE-2022-31796

libjpeg 1.63 has a heap-based buffer over-read in HierarchicalBitmapRequester::FetchRegion in hierarchicalbitmaprequester.cpp because the MCU size can be different between allocation and use.

References

Affected packages

Git / github.com/thorfdbg/libjpeg

Affected ranges

Type: GIT
Repo: https://github.com/thorfdbg/libjpeg
Events: Introduced

0 Unknown introduced commit / All previous commits are affected

Fixed

187035b9726710b4fe11d565c7808975c930895d

Type: GIT
Repo: https://github.com/thorfdbg/libjpeg
Events: Introduced

0 Unknown introduced commit / All previous commits are affected

Fixed

187035b9726710b4fe11d565c7808975c930895d

Database specific

unresolved_ranges

[
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "1.63"
            }
        ]
    }
]

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-31796.json"

vanir_signatures_modified

"2026-04-12T02:56:58Z"

vanir_signatures

[
    {
        "digest": {
            "length": 967.0,
            "function_hash": "119444156195613824511099033342764519263"
        },
        "deprecated": false,
        "signature_type": "Function",
        "id": "CVE-2022-31796-8bccecfc",
        "signature_version": "v1",
        "source": "https://github.com/thorfdbg/libjpeg/commit/187035b9726710b4fe11d565c7808975c930895d",
        "target": {
            "function": "HierarchicalBitmapRequester::PrepareForDecoding",
            "file": "control/hierarchicalbitmaprequester.cpp"
        }
    },
    {
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "275194022272869071068134012543535481483",
                "268265372830608522807979456787937917286",
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                "294690950030755224121112201988537691422"
            ]
        },
        "deprecated": false,
        "signature_type": "Line",
        "id": "CVE-2022-31796-a8404c91",
        "signature_version": "v1",
        "source": "https://github.com/thorfdbg/libjpeg/commit/187035b9726710b4fe11d565c7808975c930895d",
        "target": {
            "file": "control/hierarchicalbitmaprequester.cpp"
        }
    }
]