Is CVE-2026-3949 actively exploited?

No active exploitation of CVE-2026-3949 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-3949 be exploited remotely?

No. CVE-2026-3949 requires local access to exploit.

What is the CVSS score of CVE-2026-3949?

CVE-2026-3949 has a CVSS score of 3.3 (LOW).

HOME VULNERABILITIESCVE-2026-3949

LOW

CVE-2026-3949

CWE-119Published: March 11, 2026· Updated: Mar 12, 2026

3.3

CVSS v3.1

EPSS:0.01%probability of exploitation in 30 daysPercentile:2.0th

Official Description

A vulnerability was determined in strukturag libheif up to 1.21.2. This affects the function vvdec_push_data2 of the file libheif/plugins/decoder_vvdec.cc of the component HEIF File Parser. Executing a manipulation of the argument size can lead to out-of-bounds read. The attack needs to be launched locally. The exploit has been publicly disclosed and may be utilized. This patch is called b97c8b5f198b27f375127cd597a35f2113544d03. It is advisable to implement a patch to correct this issue.

NVD Source

Technical Analysis

CVE-2026-3949 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

From a weakness classification perspective (CWE-119): Buffer overflow vulnerabilities can lead to arbitrary code execution or denial of service by corrupting adjacent memory.