# CVE-2026-64678: Nitrite: Unfiltered Java Deserialization in Legacy v1 Database Migration Path

Status: published. Published: 2026-11-11. Updated: 2026-11-12.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- nitrite / nitrite-java: < 4.4.1 (affected). Source: CNA: GitHub_M

## Severity and prioritization

- CVSS 3.1: 9.8 (critical); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H; source: CNA: GitHub_M

- CVSS 3.1: 9.8 (critical); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H; source: NVD: security-advisories@github.com

- CISA KEV: No listing in collected sources

- EPSS: 0.66% as of 2026-11-12; percentile 52.15%

- SSVC: exploitation poc; automatable yes; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-502

## Exploit evidence

- exploit: https://github.com/nitrite/nitrite-java/security/advisories/GHSA-9297-g93h-86gg (ADP: CISA-ADP)

## References

- https://github.com/nitrite/nitrite-java/security/advisories/GHSA-9297-g93h-86gg (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/nitrite/nitrite-java/releases/tag/v4.4.1 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/nitrite/nitrite-java/security/advisories/GHSA-9297-g93h-86gg (ADP: CISA-ADP; exploit)

- https://github.com/nitrite/nitrite-java/releases/tag/v4.4.1 (security-advisories@github.com)

- https://github.com/nitrite/nitrite-java/security/advisories/GHSA-9297-g93h-86gg (security-advisories@github.com)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-64678; retrieved 2026-11-12; source updated 2026-11-12

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-64678; retrieved 2026-11-11; source updated 2026-11-11

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-64678; retrieved 2026-11-12; source updated Not reported

Revision: 7f66017cb9adae4d101e369b0f863dc60a0df1cbfbf63d567a798f8cf3b31b34

Canonical: https://y2.dev/cve/CVE-2026-64678

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