Nitrite up to 4.4.0 NitriteDataType.deserialize deserialization

Summaryinfo

A vulnerability described as critical has been identified in Nitrite up to 4.4.0. This affects the function NitriteDataType.deserialize. Such manipulation leads to deserialization. This vulnerability is listed as CVE-2026-64678. The attack may be performed from remote. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Nitrite up to 4.4.0. It has been rated as critical. Affected by this issue is the function NitriteDataType.deserialize. The manipulation with an unknown input leads to a deserialization vulnerability. Using CWE to declare the problem leads to CWE-502. The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid. Impacted is confidentiality, integrity, and availability. CVE summarizes:

NOsql Object (NO2 a.k.a Nitrite) database is an open source nosql embedded document store. Prior to version 4.4.1, when Nitrite opens a database file, MVStoreUtils.openOrCreate() automatically checks for a legacy v1-format store and, on detecting one (or hitting a compatibility error while opening), triggers an automatic migration path. This path deserializes stored values using NitriteDataType.deserialize(byte[]), which passes the raw bytes directly to java.io.ObjectInputStream.readObject() via a custom NitriteObjectInputStream subclass. That subclass overrides only readClassDescriptor() — solely to remap a handful of known legacy class names to their current equivalents — and implements no class allowlist, blocklist, or ObjectInputFilter (JEP 290). Any Serializable class reachable on the embedding application's classpath can therefore be instantiated via readObject(), with readObject()/readExternal()/readResolve() callbacks invoked unconditionally. If a suitable gadget class (e.g. from commons-collections or similar) happens to be present on the classpath, this is a precondition for remote code execution. This issue has been patched in version 4.4.1.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-64678 since 07/20/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available.

Upgrading to version 4.4.1 eliminates this vulnerability.

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Productinfo

Name

• Nitrite

Version

• 4.0
• 4.1
• 4.2
• 4.3
• 4.4.0

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