Infinite loop in libheif - CVE-2026-84446

Vulnerability identifier: #VU145243

CSH Severity: Medium

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-84446

CWE-ID: CWE-835

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to a loop with an unreachable exit condition in the HEIF sequence decode timing-table initialization and sequence decode path when processing a crafted HEIF sequence file. A remote attacker can supply a crafted file with an amplified logical output sample count to cause a denial of service.

The issue can bypass the max_sequence_frames limit because the logical output sample count is not constrained after repeat amplification.

libheif
Debian Linux
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server for SAP Applications 15
Desktop Applications Module
SUSE Package Hub 15
Ubuntu
libheif (Ubuntu package)
libheif (Debian package)
libheif-ffmpeg
libheif-ffmpeg-debuginfo
gdk-pixbuf-loader-libheif
gdk-pixbuf-loader-libheif-debuginfo
libheif-devel
libheif1
libheif-aom-debuginfo
libheif-rav1e
libheif-rav1e-debuginfo
libheif-jpeg-debuginfo
libheif-dav1d-debuginfo
libheif1-debuginfo
libheif-jpeg
libheif-debugsource
libheif-aom
libheif-dav1d

Install security update from vendor's website.

libheif - update to 1.23.2
libheif (Ubuntu package) - addressed in versions 1.1.0-2ubuntu0.1~esm5, 1.6.1-1ubuntu0.1~esm5, 1.12.0-2ubuntu0.1~esm5, 1.17.6-1ubuntu4.9, 1.21.2-3ubuntu0.6
libheif (Debian package) - update to 1.23.4-1~deb13u1
libheif-ffmpeg - update to 1.23.4-150700.3.21.1
libheif-ffmpeg-debuginfo - update to 1.23.4-150700.3.21.1
gdk-pixbuf-loader-libheif - update to 1.23.4-150700.3.21.1
gdk-pixbuf-loader-libheif-debuginfo - update to 1.23.4-150700.3.21.1
libheif-devel - update to 1.23.4-150700.3.21.1
libheif1 - update to 1.23.4-150700.3.21.1
libheif-aom-debuginfo - update to 1.23.4-150700.3.21.1
libheif-rav1e - update to 1.23.4-150700.3.21.1
libheif-rav1e-debuginfo - update to 1.23.4-150700.3.21.1
libheif-jpeg-debuginfo - update to 1.23.4-150700.3.21.1
libheif-dav1d-debuginfo - update to 1.23.4-150700.3.21.1
libheif1-debuginfo - update to 1.23.4-150700.3.21.1
libheif-jpeg - update to 1.23.4-150700.3.21.1
libheif-debugsource - update to 1.23.4-150700.3.21.1
libheif-aom - update to 1.23.4-150700.3.21.1
libheif-dav1d - update to 1.23.4-150700.3.21.1

• https://github.com/strukturag/libheif/security/advisories/GHSA-xw34-mjcp-jqh8

• Multiple vulnerabilities in libheif
• Debian update for libheif
• Ubuntu update for libheif
• SUSE update for libheif