Out-of-bounds Read Vulnerability in strukturag libheif Software
CVE-2026-3950

4.8MEDIUM

Key Information:

Vendor

Strukturag

Status
Libheif
Vendor
CVE Published:
11 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-3950?

A vulnerability has been identified in the strukturag libheif library, specifically impacting the Track::load function located in the libheif/sequences/track.cc file. This flaw can lead to an out-of-bounds read, potentially allowing an attacker to exploit the vulnerability locally. The exploit code is publicly available, emphasizing the urgency of mitigating the risk. Although a patch is in the works, it is unofficial and has not yet received validation, making immediate action for users imperative to secure their systems.

Affected Version(s)

libheif 1.21.0

libheif 1.21.1

libheif 1.21.2

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-3950 - Proof of Concept

References

https://vuldb.com/?id.350382
vdb-entrytechnical-description
https://vuldb.com/?ctiid.350382
signaturepermissions-required
https://vuldb.com/?submit.766431
third-party-advisory

CVSS V4

Score:
4.8
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
Low
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Niebelungen (VulDB User)
.