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.

The remote SUSE Linux SLES15 / SLES_SAP15 host has a package installed that is affected by a vulnerability as referenced in the SUSE-SU-2026:3113-1 advisory.

    This update for python-msgpack fixes the following issue

    - CVE-2026-57585: `Unpacker` reuse after a caught error can lead to an out-of-bounds read and a crash     (bsc#1269947).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote openSUSE 16 host has a package installed that is affected by a vulnerability as referenced in the openSUSE- SU-2026:21239-1 advisory.

    This update for python-msgpack fixes the following issue

    - CVE-2026-57585: reusing an Unpacker instance after an error has been caught can lead to an out-of-bounds     read       (bsc#1269947).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2026-57585)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
327747	SUSE SLES15 Security Update : python-msgpack (SUSE-SU-2026:3113-1)	Nessus	SuSE Local Security Checks	high
326033	openSUSE 16 Security Update : python-msgpack (openSUSE-SU-2026:21239-1)	Nessus	SuSE Local Security Checks	high
324721	Linux Distros Unpatched Vulnerability : CVE-2026-57585	Nessus	Misc.	high

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