PT-2026-24799 · Struktur Ag · Libheif

Niebelungen · Published 2026-02-23 · Updated 2026-03-11 · CVE-2026-3950

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

Buffer Overflow

Out of bounds Read

Weakness Enumeration

CWE-119

CWE-125

Related Identifiers

BDU:2026-05076

CVE-2026-3950

ECHO-D166-5C0F-238B

Affected Products

Libheif

References · 17

• 🔥 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-2026-3950 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-3950 · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-05076 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-3950 · Security Note
• https://osv.dev/vulnerability/CVE-2026-3950 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-3950 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2026-3950 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-3950 · Vendor Advisory
• https://github.com/strukturag/libheif/issues/1715 · Note
• https://twitter.com/CVEnew/status/2031867687895171084 · Twitter Post
• https://vuldb.com/?ctiid.350382 · Note
• https://github.com/strukturag/libheif · Note
• https://twitter.com/infoflowcloud/status/2031869762687426920 · Twitter Post