CVE-2026-84451

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Source
https://cve.org/CVERecord?id=CVE-2026-84451
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-84451.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-84451
Aliases
  • GHSA-hh47-fhqr-cj2r
Downstream
Related
Published
2026-09-18T16:02:22Z
Modified
2026-09-19T03:47:23Z
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: Incomplete fix for CVE-2026-62292 leaves libheif vulnerable to an out-of-bounds read
Details

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
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "1.19.0"
        },
        {
            "fixed": "1.23.3"
        }
    ],
    "source": "AFFECTED_FIELD"
}

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/cve-osv-conversion/osv-output/CVE-2026-84451.json"