GHSA-2CWQ-PWFR-WCW3 Nerdbank.MessagePack: Attacker-controlled stackalloc in DateTime decoding causes process-terminating StackOverflowException

Summary Nerdbank.MessagePack contains an uncontrolled stack allocation vulnerability in DateTime decoding. A malicious MessagePack payload can declare an oversized timestamp extension length, causing the reader to allocate an attacker-controlled number of bytes on the stack. This can trigger a...

PT-2026-38312

Summary Nerdbank.MessagePack contains an uncontrolled stack allocation vulnerability in DateTime decoding. A malicious MessagePack payload can declare an oversized timestamp extension length, causing the reader to allocate an attacker-controlled number of bytes on the stack. This can trigger a...

CVE-2026-32284

The msgpack decoder fails to properly validate the input buffer length when processing truncated fixext data format codes 0xd4-0xd8. This can lead to an out-of-bounds read and a runtime panic, allowing a denial of service attack...

CVE-2026-32284

The msgpack decoder fails to properly validate the input buffer length when processing truncated fixext data format codes 0xd4-0xd8. This can lead to an out-of-bounds read and a runtime panic, allowing a denial of service attack...

Out-of-bounds Read

Overview Affected versions of this package are vulnerable to Out-of-bounds Read due to improper validation of input in the fixext process. An attacker can cause the application to panic and terminate unexpectedly by sending specially crafted MessagePack data. Remediation There is no fixed version...

Out-of-bounds Read

Overview Affected versions of this package are vulnerable to Out-of-bounds Read due to improper validation of input in the fixext process. An attacker can cause the application to panic and terminate unexpectedly by sending specially crafted MessagePack data. Remediation There is no fixed version...

Out-of-bounds Read

Overview github.com/shamaton/msgpack/v3/internal/decoding is a None Affected versions of this package are vulnerable to Out-of-bounds Read. due to improper validation of input in the fixext process. An attacker can cause the application to panic and terminate unexpectedly by sending specially...

CVE-2026-2454

A denial of service flaw has been discovered in mattermost server. Affected versions fail to handle incorrectly reported array lengths which allows malicious user to cause OOM errors and crash the server via sending corrupted msgpack frames within websocket messages to calls plugin. Mitigation...

CVE-2026-2454 DoS in Calls plugin via malformed msgpack in websocket request.

Mattermost versions 11.3.x = 11.3.0, 11.2.x = 11.2.2, 10.11.x = 10.11.10 fail to handle incorrectly reported array lengths which allows malicious user to cause OOM errors and crash the server via sending corrupted msgpack frames within websocket messages to calls plugin. Mattermost Advisory ID:...

PYSEC-2026-83

LangGraph SQLite Checkpoint is an implementation of LangGraph CheckpointSaver that uses SQLite DB both sync and async, via aiosqlite. In version 1.0.9 and prior, LangGraph checkpointers can load msgpack-encoded checkpoints that reconstruct Python objects during deserialization. If an attacker can...

CVE-2026-28277 LangGraph: Unsafe msgpack deserialization in LangGraph checkpoint loading

LangGraph SQLite Checkpoint is an implementation of LangGraph CheckpointSaver that uses SQLite DB both sync and async, via aiosqlite. In version 1.0.9 and prior, LangGraph checkpointers can load msgpack-encoded checkpoints that reconstruct Python objects during deserialization. If an attacker can...

PT-2026-23498

Name of the Vulnerable Software and Affected Versions LangGraph versions 1.0.9 and earlier Description LangGraph checkpointers can load msgpack-encoded checkpoints that reconstruct Python objects during deserialization. If an attacker gains privileged write access to the checkpoint data store e.g...

Denial-of-Service (DoS)

MessagePack for Java is vulnerable to a Denial-Of-Service DoS . The vulnerability is due to unbounded memory allocation during deserialization, where the library trusts attacker-controlled EXT32 payload length metadata and allocates a byte array of that declared size when ExtensionValue.getData i...

GHSA-CW39-R4H6-8J3X MessagePack for Java Vulnerable to Remote DoS via Malicious EXT Payload Allocation

Summary Affected Components: org.msgpack.core.MessageUnpacker.readPayload org.msgpack.core.MessageUnpacker.unpackValue org.msgpack.value.ExtensionValue.getData A denial-of-service vulnerability exists in MessagePack for Java when deserializing .msgpack files containing EXT32 objects with...

MessagePack for Java Vulnerable to Remote DoS via Malicious EXT Payload Allocation

Summary Affected Components: org.msgpack.core.MessageUnpacker.readPayload org.msgpack.core.MessageUnpacker.unpackValue org.msgpack.value.ExtensionValue.getData A denial-of-service vulnerability exists in MessagePack for Java when deserializing .msgpack files containing EXT32 objects with...

EUVD-2026-0750

MessagePack for Java Vulnerable to Remote DoS via Malicious EXT Payload Allocation...

CVE-2026-21452

MessagePack for Java is a serializer implementation for Java. A denial-of-service vulnerability exists in versions prior to 0.9.11 when deserializing .msgpack files containing EXT32 objects with attacker-controlled payload lengths. While MessagePack-Java parses extension headers lazily, it later...

Linux Distros Unpatched Vulnerability : CVE-2026-21452

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - MessagePack for Java is a serializer implementation for Java. A denial-of-service vulnerability exists in versions prior to 0.9.11 when deserializing .msgpack...

DEBIAN-CVE-2026-21452

MessagePack for Java is a serializer implementation for Java. A denial-of-service vulnerability exists in versions prior to 0.9.11 when deserializing .msgpack files containing EXT32 objects with attacker-controlled payload lengths. While MessagePack-Java parses extension headers lazily, it later...

CVE-2026-21452

MessagePack for Java is a serializer implementation for Java. A denial-of-service vulnerability exists in versions prior to 0.9.11 when deserializing .msgpack files containing EXT32 objects with attacker-controlled payload lengths. While MessagePack-Java parses extension headers lazily, it later...