{"cvss":0.0,"datePublished":"2026-02-14T00:00:00Z","dateUpdated":"2026-02-14T00:00:00Z","description":"XStream is a simple library to serialize objects to XML and back again. In affected versions this vulnerability may allow a remote attacker to request data from internal resources that are not publicly available only by manipulating the processed input stream with a Java runtime version 14 to 8. No user is affected, who followed the recommendation to setup XStream's security framework with a whitelist limited to the minimal required types. If you rely on XStream's default blacklist of the [Security Framework](https://x-stream.github.io/security.html#framework), you will have to use at least version 1.4.18.","dueDate":"","id":"CVE-2021-39152","kev_catalogs":["vulncheck"],"knownRansomwareCampaignUse":"Unknown","product":"XStream","requiredAction":"Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.","severity":"HIGH","source":"vulncheck_kev","title":"XStream XStream Deserialization of Untrusted Data","vendor":"XStream"}