CVE-2026-84451

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Source
https://cve.org/CVERecord?id=CVE-2026-84451
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-84451.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-84451
Aliases
  • GHSA-hh47-fhqr-cj2r
Downstream
Related
Published
2026-09-18T16:02:22Z
Modified
2026-09-22T10:41:42Z
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
8bfed9a9ed008e4ef28abc736284a90d3cba754f
Fixed
78c9746aea226b22885e8d35241353ce669c4ea5
Database specific
Show details 
{
    "extracted_events":  [
        {
            "introduced":  "1.19.0"
        },
        {
            "fixed":  "1.23.3"
        }
    ],
    "source":  [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

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 
"2026-09-20T08:13:44Z"