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Date: Wed, 12 Jan 2022 13:32:51 +0100
From: Ana Oprea <>
Subject: CVE-2021-22569: Protobuf Java, Kotlin, JRuby DoS

A potential Denial of Service issue in protobuf-java was discovered in the
parsing procedure for binary data.
- Reporter: OSS-Fuzz [1]
- Affected versions: All versions of Java Protobufs (including Kotlin and
JRuby) prior to the versions listed below. Protobuf "javalite" users
(typically Android) are not affected.

CVE-2021-22569 High - CVSS Score: 7.5 [2]
An implementation weakness in how unknown fields are parsed in Java. A
small (~800 KB) malicious payload can occupy the parser for several minutes
by creating large numbers of short-lived objects that cause frequent,
repeated GC pauses.

Proof of Concept
For reproduction details, please refer to the oss-fuzz issue [3] that
identifies the specific inputs that exercise this parsing weakness.

Remediation and Mitigation
Please update to the latest available versions of the following packages:
- protobuf-java (3.16.1, 3.18.2, 3.19.2)
- protobuf-kotlin (3.18.2, 3.19.2)
- google-protobuf [JRuby gem] (3.19.2)


Kind regards,

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