Uncontrolled Recursion Affecting org.msgpack:msgpack-core package, versions [0,]
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JAVA-ORGMSGPACK-19778374
- published14 Sept 2026
- disclosed12 Sept 2026
- creditWayde Shi
Introduced: 12 Sep 2026
NewCVE-2026-90472 (opens in a new tab)How to fix?
There is no fixed version for org.msgpack:msgpack-core.
Overview
Affected versions of this package are vulnerable to Uncontrolled Recursion due to recursive deserialization in MessageUnpacker.unpackValue() in msgpack-core/src/main/java/org/msgpack/core/MessageUnpacker.java. An attacker can trigger StackOverflowError by supplying MessagePack payloads with deeply nested arrays or maps. This causes per-request deserialization failures in applications that unpack untrusted MessagePack data, breaking request handling for affected threads and denying service for those requests.