High
Security advisory
XStream is a Java library to serialize objects to XML and back again. In XStream before version 1.4.16, there is a vulnerability where the processed stream at unmarshalling time contains type information to recreate the formerly written objects. XStream creates therefore new instances based on these type information. An attacker can manipulate the processed input stream and replace or inject objects, that result in the deletion of a file on the local host. 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, you will have to use at least version 1.4.16.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2021-21343
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 08:55 UTC · Revision 1
Source evidence
XStream is a Java library to serialize objects to XML and back again. In XStream before version 1.4.16, there is a vulnerability where the processed stream at unmarshalling time contains type information to recreate the formerly written objects. XStream creates therefore new instances based on these type information. An attacker can manipulate the processed input stream and replace or inject objects, that result in the deletion of a file on the local host. 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, you will have to use at least version 1.4.16.
osv:CVE-2021-21343
Complete source record
{
"id": "fbb14cd2b40ba7827eb1fe33ea45ddc11630da813790c76a808b3dc920bdd151",
"url": "https://osv.dev/vulnerability/CVE-2021-21343",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2021-21343",
"summary": "XStream is a Java library to serialize objects to XML and back again. In XStream before version 1.4.16, there is a vulnerability where the processed stream at unmarshalling time contains type information to recreate the formerly written objects. XStream creates therefore new instances based on these type information. An attacker can manipulate the processed input stream and replace or inject objects, that result in the deletion of a file on the local host. 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, you will have to use at least version 1.4.16.",
"evidence": "osv:CVE-2021-21343",
"products": [],
"severity": "high",
"structured": {
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"aliases": [
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"CVE-2021-21343",
"GHSA-74cv-f58x-f9wf"
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"metrics": [
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"type": "CVSS_V3",
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}
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"affected": [
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{
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"versions": [
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"v5.4.1-rc2",
"rel/v5.4.1",
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],
"versions": [
"XSTREAM_1_4_15",
"XSTREAM_1_4_14",
"XSTREAM_1_4_13",
"XSTREAM_1_4_12",
"XSTREAM_1_4_11_1",
"XSTREAM_1_4_11",
"XSTREAM_1_4_10",
"XSTREAM_1_4_9",
"XSTREAM_1_4_5"
],
"database_specific": {
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}
],
"modified": "2026-10-24T10:50:40.496463225Z",
"provider": "osv",
"references": [
"https://github.com/x-stream/xstream/security/advisories/GHSA-74cv-f58x-f9wf",
"https://lists.debian.org/debian-lts-announce/2021/04/msg00002.html",
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/22KVR6B5IZP3BGQ3HPWIO2FWWCKT3DHP/",
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PVPHZA7VW2RRSDCOIPP2W6O5ND254TU7/",
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QGXIU3YDPG6OGTDHMBLAFN7BPBERXREB/",
"https://security.netapp.com/advisory/ntap-20210430-0002/",
"https://www.debian.org/security/2021/dsa-5004",
"https://www.oracle.com//security-alerts/cpujul2021.html",
"https://www.oracle.com/security-alerts/cpuoct2021.html",
"https://x-stream.github.io/security.html#workaround",
"https://lists.apache.org/thread.html/r8244fd0831db894d5e89911ded9c72196d395a90ae655414d23ed0dd%40%3Cusers.activemq.apache.org%3E",
"https://lists.apache.org/thread.html/r9ac71b047767205aa22e3a08cb33f3e0586de6b2fac48b425c6e16b0%40%3Cdev.jmeter.apache.org%3E",
"https://www.oracle.com/security-alerts/cpujan2022.html",
"https://x-stream.github.io/CVE-2021-21343.html"
],
"provider_metadata": {
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{
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{
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},
{
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},
{
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"cpe:2.3:a:oracle:retail_xstore_point_of_service:18.0.3:*:*:*:*:*:*:*",
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},
{
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{
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},
{
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]
}
},
"related_cves": [
{
"value": "CVE-2021-21343",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 442454,
"published_at": "2021-03-23T00:15:12.6+00:00"
}