Critical
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 which may allow a remote attacker to execute arbitrary code only by manipulating the processed input stream. 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-2021-21350
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 08:39 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 which may allow a remote attacker to execute arbitrary code only by manipulating the processed input stream. 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-2021-21350
Complete source record
{
"id": "d92d4701764a3eb832964ba6269a6d4bf87b0a1169058972c043638c698c0994",
"url": "https://osv.dev/vulnerability/CVE-2021-21350",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2021-21350",
"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 which may allow a remote attacker to execute arbitrary code only by manipulating the processed input stream. 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-2021-21350",
"products": [],
"severity": "critical",
"structured": {
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"aliases": [
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"metrics": [
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"versions": [
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"v5.4.1-rc2",
"rel/v5.4.1",
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"rel/v5.4",
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"rel/v5.3",
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"rel/v5.2.1",
"v5.2.1-rc4",
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],
"versions": [
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"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",
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],
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],
"modified": "2026-10-24T10:47:52.971863769Z",
"provider": "osv",
"references": [
"https://github.com/x-stream/xstream/security/advisories/GHSA-43gc-mjxg-gvrq",
"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-2021-21350.html"
],
"provider_metadata": {
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{
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},
{
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},
{
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},
{
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{
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},
"related_cves": [
{
"value": "CVE-2021-21350",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 441597,
"published_at": "2021-03-23T00:15:13.273+00:00"
}