CVE-2026-84451

libheif is a HEIF and AVIF file format decoder and encoder. From 1.19.0 until 1.23.3, the no-icef full-item branch of unc_decoder::get_compressed_image_data_uncompressed() in libheif/codecs/uncompressed/unc_decoder.cc retains an addition-based range check that can wrap when a crafted uncompressed tile grid produces a large range_start_offset and range_size. The overflow makes the bounds comparison pass and allows heif_image_handle_decode_image_tile() to call memcpy() with an invalid source pointer and a very large length when decoding a valid high-index advertised tile. This incomplete remediation of CVE-2026-62292 can reliably crash tile-processing applications, while whole-image decoding is not claimed to reach the demonstrated path. This issue is fixed in version 1.23.3.

Database specific

{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-125"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/84xxx/CVE-2026-84451.json"
}

References

Affected packages

Git / github.com/strukturag/libheif

Affected ranges

Type

GIT

Repo

https://github.com/strukturag/libheif

Events

Introduced

c4e4657dcf6bcc06e934632f97736f7c78dbff9e

Fixed

78c9746aea226b22885e8d35241353ce669c4ea5

Fixed

8bfed9a9ed008e4ef28abc736284a90d3cba754f

Database specific

Show details

{
    "extracted_events": [
        {
            "range": [
                {
                    "introduced": "1.19.0"
                },
                {
                    "fixed": "1.23.3"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StringRangeExpression"
        },
        {
            "range": [
                {
                    "fixed": "8bfed9a9ed008e4ef28abc736284a90d3cba754f"
                }
            ],
            "source": "REFERENCES_COMMIT"
        },
        {
            "original_tag": "v1.23.3",
            "range": [
                {
                    "fixed": "78c9746aea226b22885e8d35241353ce669c4ea5"
                }
            ],
            "source": "REFERENCES_TAG"
        }
    ]
}

Affected versions

v1.*

v1.19.0

v1.19.1

v1.19.2

v1.19.3

v1.19.4

v1.19.5

v1.20.0

v1.20.1

v1.21.0

v1.21.1

v1.21.2

v1.22.0

v1.22.1

v1.22.2

v1.23.0

v1.23.1

v1.23.2

Database specific

source

"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-84451.json"

vanir_signatures

[
    {
        "deprecated": false,
        "digest": {
            "function_hash": "122515340523743000692419636798249179788",
            "length": 2932
        },
        "id": "CVE-2026-84451-51ec2111",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/strukturag/libheif/commit/8bfed9a9ed008e4ef28abc736284a90d3cba754f",
        "target": {
            "file": "libheif/codecs/uncompressed/unc_decoder.cc",
            "function": "unc_decoder::get_compressed_image_data_uncompressed"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "157773266475716883312276441226944622845",
                "301697979167988542478748232332303574719",
                "86520503334819419963639447664287200330",
                "280614601139895828286494313771936772299"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2026-84451-d0bd9237",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/strukturag/libheif/commit/8bfed9a9ed008e4ef28abc736284a90d3cba754f",
        "target": {
            "file": "libheif/codecs/uncompressed/unc_decoder.cc"
        }
    }
]

vanir_signatures_modified

"2026-10-22T16:40:55Z"