Is CVE-2026-57585 actively exploited?

No active exploitation of CVE-2026-57585 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-57585 be exploited remotely?

Yes. CVE-2026-57585 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-57585?

CVE-2026-57585 has a CVSS score of 7.5 (HIGH).

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HIGH

CVE-2026-57585

CWE-416Published: June 30, 2026· Updated: Jul 2, 2026

7.5

CVSS v3.1

Official Description

MessagePack is the serializer implementation for Python msgpack.org. Prior to 1.2.1, there is an Out-of-bounds read/crash on Unpacker reuse after a caught error, potentially leading to a DoS attack. If the Unpacker is used repeatedly after an error occurs, the process may crash with a SEGV. This issue has been fixed in version 1.2.1.

NVD Source

Technical Analysis

CVE-2026-57585 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

From a weakness classification perspective (CWE-416): Use-after-free vulnerabilities involve accessing memory after it has been freed, often enabling arbitrary code execution.