PT-2026-24799 · Struktur Ag+2 · Libheif+2

Niebelungen · CVE-2026-3950 · Published 2026-02-23 · Updated 2026-06-24

Positive Technologies (AI Summary)

CVSS v3.1

3.3

Low

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Name of the Vulnerable Software and Affected Versions strukturag libheif versions up to 1.21.2

Description A flaw exists in strukturag libheif, specifically within the Track::load function located in the libheif/sequences/track.cc file, related to the stsz/stts component. This can lead to an out-of-bounds read condition. The attack requires local access. An exploit for this issue is publicly available.

Recommendations Apply a patch to address this issue. Note that the available patch is currently unofficial and not yet approved.

Exploit

Fix

Out of bounds Read

Buffer Overflow

Weakness Enumeration

CWE-125

CWE-119

Related Identifiers

BDU:2026-05076

CVE-2026-3950

ECHO-D166-5C0F-238B

OPENSUSE-SU-2026:10878-1

OPENSUSE-SU-2026:20974-1

SUSE-SU-2026:22153-1

SUSE-SU-2026:2622-1

USN-8454-1

Affected Products

Linuxmint

Ubuntu

Libheif

References · 79

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/3xxx/CVE-2026-3950.json · Exploit
• 🔥 https://github.com/Niebelungen-D/pocs/tree/main/heif_dec_sequence_chunk_idx_oob · Exploit
• https://github.com/strukturag/libheif/pull/1721 · Patch
• https://ubuntu.com/security/CVE-2026-32882 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2026:22153-1 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-3950 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-32738 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-32741 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-41071 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-32740 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2026:10878-1 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-3950 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-3950 · Security Note
• https://ubuntu.com/security/CVE-2026-3950 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-41069 · Vendor Advisory