Is CVE-2026-49337 actively exploited?

No active exploitation of CVE-2026-49337 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-49337 be exploited remotely?

Yes. CVE-2026-49337 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-49337?

CVE-2026-49337 has a CVSS score of 4.3 (MEDIUM).

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MEDIUM

CVE-2026-49337

CWE-770Published: June 19, 2026· Updated: Jun 23, 2026

4.3

CVSS v3.1

Official Description

libde265 is an open source implementation of the h.265 video codec. Prior to version 1.0.20, a crafted sequence of H.265 NAL units causes `decoder_context::read_slice_NAL()` (`libde265/decctx.cc:481`) to attach slice headers to a finished picture object

that has no active image unit, resulting in attacker-controlled unbounded heap growth. The retained headers are never freed until the picture is released, which may not happen during continuous streaming. Version 1.0.20 patches the issue.

NVD Source

Technical Analysis

CVE-2026-49337 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.