Is CVE-2026-49271 actively exploited?

No active exploitation of CVE-2026-49271 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-49271 be exploited remotely?

Yes. CVE-2026-49271 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-49271?

CVE-2026-49271 has a CVSS score of 6.5 (MEDIUM).

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MEDIUM

CVE-2026-49271

CWE-125Published: June 19, 2026· Updated: Jun 26, 2026

6.5

CVSS v3.1

Official Description

libheif is a HEIF and AVIF file format decoder and encoder. Prior to version 1.22.1, the uncompressed HEIF decoder validates explicit icef compressed-unit offsets using unit_offset + unit_size. Because the addition can wrap, a crafted HEIF file can pass the range check and then construct a vector from iterators outside the compressed item buffer, producing an out-of-bounds heap read and crash. Version 1.22.1 patches the issue.

NVD Source

Technical Analysis

CVE-2026-49271 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 6.5.