CVE-2026-32738

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Source
https://cve.org/CVERecord?id=CVE-2026-32738
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-32738.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-32738
Aliases
  • GHSA-7f2h-cmpf-v9ww
Downstream
Related
Published
2026-05-19T19:03:48.553Z
Modified
2026-07-15T19:00:07.540173Z
Severity
  • 6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H CVSS Calculator
Summary
libheif has a Heap OOB Read/SEGV Crash via Zero samples_per_chunk
Details

libheif is a HEIF and AVIF file format decoder and encoder. In versions 1.21.2 and below, a crafted 792-byte HEIF sequence file with samplesperchunk=0 in the stsc box causes an unsigned integer underflow in the Chunk constructor (mlastsample = 0 + 0 - 1 = UINT32_MAX), mapping all samples to an empty chunk and resulting in a denial of service. When any sample is accessed, the library reads from index 0 of an empty std::vector, causing a guaranteed SEGV (null-page read). The file parses successfully without producing an error; the crash occurs on the first frame access. This issue has been fixed in version 1.22.0.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/32xxx/CVE-2026-32738.json",
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-125",
        "CWE-476"
    ]
}
References

Affected packages

Git / github.com/strukturag/libheif

Affected ranges

Type
GIT
Repo
https://github.com/strukturag/libheif
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
0c81a846b7401dbdb7118afd0761057f21e43511
Database specific 
{
    "cpe": "cpe:2.3:a:struktur:libheif:*:*:*:*:*:*:*:*",
    "source": [
        "AFFECTED_FIELD",
        "CPE_RANGE"
    ],
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "1.22.0"
        }
    ]
}

Affected versions

v1.*
v1.1.0
v1.10.0
v1.11.0
v1.12.0
v1.13.0
v1.14.0
v1.14.1
v1.14.2
v1.15.0
v1.15.1
v1.15.2
v1.16.0
v1.16.1
v1.16.2
v1.17.0
v1.17.1
v1.17.2
v1.17.3
v1.17.4
v1.17.5
v1.17.6
v1.18.0
v1.18.0-rc1
v1.19.0
v1.19.1
v1.19.2
v1.19.3
v1.19.4
v1.19.5
v1.2.0
v1.20.0
v1.20.1
v1.21.0
v1.21.1
v1.21.2
v1.3.0
v1.3.1
v1.3.2
v1.7.0
v1.8.0
v1.9.0
v1.9.1

Database specific

vanir_signatures 
[
    {
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "175107675317900759648359576881034358256",
                "220432159010798240840908416937024023837",
                "268268967745545109707798594937166387611",
                "253707932335489477155115861206639265538",
                "199679408075604976163979654915891773303",
                "175107675317900759648359576881034358256",
                "220432159010798240840908416937024023837",
                "268268967745545109707798594937166387611",
                "286778284410146987248233194002847271266",
                "178248309108630471590778685235254536836"
            ]
        },
        "signature_version": "v1",
        "source": "https://github.com/strukturag/libheif/commit/0c81a846b7401dbdb7118afd0761057f21e43511",
        "signature_type": "Line",
        "target": {
            "file": "tests/uncompressed_box.cc"
        },
        "id": "CVE-2026-32738-91619f1d",
        "deprecated": false
    }
]
vanir_signatures_modified 
"2026-07-15T19:00:07Z"
source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-32738.json"