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CVE-2026-3949

MEDIUM CVSS 4.0: 4.8 EPSS 0.02%
Updated Mar 11, 2026
Parameter Value
CVSS 4.8 (MEDIUM)
Type CWE-125 (Out-of-bounds Read), CWE-119 (Buffer Overflow)
Public PoC Yes

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.

Attack Parameters

Attack Vector
Local
Requires local access
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed

Impact Assessment

Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
Low
Partial disruption

CVSS Vector v4.0