UBUNTU-CVE-2026-32738

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Source
https://ubuntu.com/security/CVE-2026-32738
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-32738.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-32738
Upstream
Downstream
Related
Published
2026-05-19T19:16:00Z
Modified
2026-06-18T22:00:20Z
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
  • 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
  • Ubuntu - medium
Summary
[none]
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 samples_per_chunk=0 in the stsc box causes an unsigned integer underflow in the Chunk constructor (m_last_sample = 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.

References

Affected packages

Ubuntu:25.10 / libheif

Package

Name
libheif
Purl
pkg:deb/ubuntu/libheif?arch=source&distro=questing

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.20.2-1ubuntu0.4

Affected versions

1.*
1.19.7-1
1.19.8-1
1.20.2-1
1.20.2-1ubuntu0.1
1.20.2-1ubuntu0.3

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "heif-gdk-pixbuf",
            "binary_version": "1.20.2-1ubuntu0.4"
        },
        {
            "binary_name": "heif-thumbnailer",
            "binary_version": "1.20.2-1ubuntu0.4"
        },
        {
            "binary_name": "heif-view",
            "binary_version": "1.20.2-1ubuntu0.4"
        },
        {
            "binary_name": "libheif-examples",
            "binary_version": "1.20.2-1ubuntu0.4"
        },
        {
            "binary_name": "libheif-plugin-aomdec",
            "binary_version": "1.20.2-1ubuntu0.4"
        },
        {
            "binary_name": "libheif-plugin-aomenc",
            "binary_version": "1.20.2-1ubuntu0.4"
        },
        {
            "binary_name": "libheif-plugin-dav1d",
            "binary_version": "1.20.2-1ubuntu0.4"
        },
        {
            "binary_name": "libheif-plugin-ffmpegdec",
            "binary_version": "1.20.2-1ubuntu0.4"
        },
        {
            "binary_name": "libheif-plugin-j2kdec",
            "binary_version": "1.20.2-1ubuntu0.4"
        },
        {
            "binary_name": "libheif-plugin-j2kenc",
            "binary_version": "1.20.2-1ubuntu0.4"
        },
        {
            "binary_name": "libheif-plugin-jpegdec",
            "binary_version": "1.20.2-1ubuntu0.4"
        },
        {
            "binary_name": "libheif-plugin-jpegenc",
            "binary_version": "1.20.2-1ubuntu0.4"
        },
        {
            "binary_name": "libheif-plugin-kvazaar",
            "binary_version": "1.20.2-1ubuntu0.4"
        },
        {
            "binary_name": "libheif-plugin-libde265",
            "binary_version": "1.20.2-1ubuntu0.4"
        },
        {
            "binary_name": "libheif-plugin-rav1e",
            "binary_version": "1.20.2-1ubuntu0.4"
        },
        {
            "binary_name": "libheif-plugin-svtenc",
            "binary_version": "1.20.2-1ubuntu0.4"
        },
        {
            "binary_name": "libheif-plugin-x265",
            "binary_version": "1.20.2-1ubuntu0.4"
        },
        {
            "binary_name": "libheif-plugins-all",
            "binary_version": "1.20.2-1ubuntu0.4"
        },
        {
            "binary_name": "libheif1",
            "binary_version": "1.20.2-1ubuntu0.4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-32738.json"

Ubuntu:26.04:LTS / libheif

Package

Name
libheif
Purl
pkg:deb/ubuntu/libheif?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.21.2-3ubuntu0.1

Affected versions

1.*
1.20.2-1
1.20.2-2
1.20.2-2build1
1.20.2-2build2
1.20.2-2ubuntu1
1.21.2-1
1.21.2-3

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "heif-gdk-pixbuf",
            "binary_version": "1.21.2-3ubuntu0.1"
        },
        {
            "binary_name": "heif-thumbnailer",
            "binary_version": "1.21.2-3ubuntu0.1"
        },
        {
            "binary_name": "heif-view",
            "binary_version": "1.21.2-3ubuntu0.1"
        },
        {
            "binary_name": "libheif-examples",
            "binary_version": "1.21.2-3ubuntu0.1"
        },
        {
            "binary_name": "libheif-plugin-aomdec",
            "binary_version": "1.21.2-3ubuntu0.1"
        },
        {
            "binary_name": "libheif-plugin-aomenc",
            "binary_version": "1.21.2-3ubuntu0.1"
        },
        {
            "binary_name": "libheif-plugin-dav1d",
            "binary_version": "1.21.2-3ubuntu0.1"
        },
        {
            "binary_name": "libheif-plugin-ffmpegdec",
            "binary_version": "1.21.2-3ubuntu0.1"
        },
        {
            "binary_name": "libheif-plugin-j2kdec",
            "binary_version": "1.21.2-3ubuntu0.1"
        },
        {
            "binary_name": "libheif-plugin-j2kenc",
            "binary_version": "1.21.2-3ubuntu0.1"
        },
        {
            "binary_name": "libheif-plugin-jpegdec",
            "binary_version": "1.21.2-3ubuntu0.1"
        },
        {
            "binary_name": "libheif-plugin-jpegenc",
            "binary_version": "1.21.2-3ubuntu0.1"
        },
        {
            "binary_name": "libheif-plugin-kvazaar",
            "binary_version": "1.21.2-3ubuntu0.1"
        },
        {
            "binary_name": "libheif-plugin-libde265",
            "binary_version": "1.21.2-3ubuntu0.1"
        },
        {
            "binary_name": "libheif-plugin-rav1e",
            "binary_version": "1.21.2-3ubuntu0.1"
        },
        {
            "binary_name": "libheif-plugin-svtenc",
            "binary_version": "1.21.2-3ubuntu0.1"
        },
        {
            "binary_name": "libheif-plugin-x265",
            "binary_version": "1.21.2-3ubuntu0.1"
        },
        {
            "binary_name": "libheif-plugins-all",
            "binary_version": "1.21.2-3ubuntu0.1"
        },
        {
            "binary_name": "libheif1",
            "binary_version": "1.21.2-3ubuntu0.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-32738.json"