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Amazon Linux 2023 : heif-pixbuf-loader, libheif, libheif-devel (ALAS2023-2026-1971)

medium Nessus Plugin ID 328456

Synopsis

The remote Amazon Linux 2023 host is missing a security update.

Description

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1971 advisory.

 Heap Information Disclosure via Grid Image Gap + Uninitialized Pixel Plane Allocation (CVE-2026-47247)

 libheif crashes in the public C API heif_image_handle_get_image_tiling() when a malformed uncompressed HEIF image item has an associated uncC property but no associated ispe property. In debug builds this trips the ispe && uncC assertion in ImageItem_uncompressed::get_heif_image_tiling(). In a release/NDEBUG ASan build, the same file causes a null pointer read at address 0xa8. (CVE-2026-47709)

 Integer overflow in inline mask size calculation causes undersized buffer allocation (CVE-2026-47714)

 heap OOB read in ImageItem_Grid::decode_grid_tile via irot-induced tile-coordinate underflow (CVE-2026-48029)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Run 'dnf update libheif --releasever 2023.12.20260720' or or 'dnf update --advisory ALAS2023-2026-1971 --releasever 2023.12.20260720' to update your system.

See Also

https://alas.aws.amazon.com//AL2023/ALAS2023-2026-1971.html

https://alas.aws.amazon.com/faqs.html

https://explore.alas.aws.amazon.com/CVE-2026-47247.html

https://explore.alas.aws.amazon.com/CVE-2026-47709.html

https://explore.alas.aws.amazon.com/CVE-2026-47714.html

https://explore.alas.aws.amazon.com/CVE-2026-48029.html

Plugin Details

Severity: Medium

ID: 328456

File Name: al2023_ALAS2023-2026-1971.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 7/20/2026

Updated: 7/20/2026

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.5

Percentile: 51.96

CVSS v2

Risk Factor: Medium

Base Score: 5.6

Temporal Score: 4.1

Vector: CVSS2#AV:L/AC:L/Au:N/C:P/I:N/A:C

CVSS Score Source: CVE-2026-48029

CVSS v3

Risk Factor: Medium

Base Score: 6.2

Temporal Score: 5.4

Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

CVSS Score Source: CVE-2026-47247

Vulnerability Information

CPE: cpe:/o:amazon:linux:2023, p-cpe:/a:amazon:linux:heif-pixbuf-loader-debuginfo, p-cpe:/a:amazon:linux:heif-pixbuf-loader, p-cpe:/a:amazon:linux:libheif-debuginfo, p-cpe:/a:amazon:linux:libheif-debugsource, p-cpe:/a:amazon:linux:libheif-devel, p-cpe:/a:amazon:linux:libheif-tools-debuginfo, p-cpe:/a:amazon:linux:libheif-tools, p-cpe:/a:amazon:linux:libheif

Required KB Items: Host/local_checks_enabled, Host/AmazonLinux/release, Host/AmazonLinux/rpm-list

Exploit Ease: No known exploits are available

Patch Publication Date: 7/20/2026

Vulnerability Publication Date: 7/20/2026

Reference Information

CVE: CVE-2026-47247, CVE-2026-47709, CVE-2026-47714, CVE-2026-48029