Server-Side Forgery Request can be activated unmarshalling with XStream

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Summary

CVECVE-2020-26258
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2020-12-16 01:15:12 UTC
Updated2026-10-07 19:17:17 UTC
DescriptionXStream is a Java library to serialize objects to XML and back again. In XStream before version 1.4.15, a Server-Side Forgery Request vulnerability can be activated when unmarshalling. The vulnerability may allow a remote attacker to request data from internal resources that are not publicly available only by manipulating the processed input stream. If you rely on XStream's default blacklist of the Security Framework, you will have to use at least version 1.4.15. The reported vulnerability does not exist if running Java 15 or higher. No user is affected who followed the recommendation to setup XStream's Security Framework with a whitelist! Anyone relying on XStream's default blacklist can immediately switch to a whilelist for the allowed types to avoid the vulnerability. Users of XStream 1.4.14 or below who still want to use XStream default blacklist can use a workaround described in more detailed in the referenced advisories.

Risk And Classification

Primary CVSS: v3.1 7.7 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

EPSS: 0.818170000 probability, percentile 0.996410000 (date 2026-10-07)

Problem Types: CWE-918 | CWE-918 CWE-918: Server-Side Request Forgery (SSRF)

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary7.7HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
3.1[email protected]Secondary6.3MEDIUMCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
3.1CNADECLARED6.3MEDIUMCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
2.0[email protected]Primary5AV:N/AC:L/Au:N/C:P/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

CVSS v2.0 Breakdown

Access Vector
Network
Access Complexity
Low
Authentication
None
Confidentiality
Partial
Integrity
None
Availability
None

AV:N/AC:L/Au:N/C:P/I:N/A:N

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Apache Struts All All All All
Operating System Debian Debian Linux 10.0 All All All
Operating System Debian Debian Linux 9.0 All All All
Operating System Fedoraproject Fedora 33 All All All
Operating System Fedoraproject Fedora 34 All All All
Operating System Fedoraproject Fedora 35 All All All
Application Xstream Xstream All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA X-stream Xstream affected < 1.4.15 Not specified

References

ReferenceSourceLinkTags
December 2020 XStream Vulnerabilities in NetApp Products | NetApp Product Security af854a3a-2127-422b-91ae-364da2661108 security.netapp.com Third Party Advisory
[SECURITY] Fedora 35 Update: xstream-1.4.18-2.fc35 - package-announce - Fedora Mailing-Lists af854a3a-2127-422b-91ae-364da2661108 lists.fedoraproject.org Mailing List
[SECURITY] [DLA 2507-1] libxstream-java security update af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Mailing List, Third Party Advisory
XStream - CVE-2020-26258 af854a3a-2127-422b-91ae-364da2661108 x-stream.github.io Exploit, Mitigation, Third Party Advisory
lists.fedoraproject.org/archives/list/[email protected]/messag... [email protected] lists.fedoraproject.org Mailing List
[SECURITY] Fedora 33 Update: xstream-1.4.18-2.fc33 - package-announce - Fedora Mailing-Lists af854a3a-2127-422b-91ae-364da2661108 lists.fedoraproject.org Mailing List
Pony Mail! af854a3a-2127-422b-91ae-364da2661108 lists.apache.org Issue Tracking, Mailing List
Pony Mail! [email protected] lists.apache.org Issue Tracking, Mailing List
security.netapp.com/advisory/ntap-20210409-0005 [email protected] security.netapp.com Third Party Advisory
[SECURITY] Fedora 34 Update: xstream-1.4.18-2.fc34 - package-announce - Fedora Mailing-Lists af854a3a-2127-422b-91ae-364da2661108 lists.fedoraproject.org Mailing List
lists.fedoraproject.org/archives/list/[email protected]/messag... [email protected] lists.fedoraproject.org Mailing List
lists.fedoraproject.org/archives/list/[email protected]/messag... [email protected] lists.fedoraproject.org Mailing List
A Server-Side Forgery Request can be activated unmarshalling with XStream · Advisory · x-stream/xstream · GitHub af854a3a-2127-422b-91ae-364da2661108 github.com Mitigation, Third Party Advisory
Debian -- Security Information -- DSA-4828-1 libxstream-java af854a3a-2127-422b-91ae-364da2661108 www.debian.org Third Party Advisory
[SECURITY] Fedora 35 Update: xstream-1.4.18-2.fc35 - package-announce - Fedora Mailing-Lists MITRE lists.fedoraproject.org
[SECURITY] Fedora 34 Update: xstream-1.4.18-2.fc34 - package-announce - Fedora Mailing-Lists MITRE lists.fedoraproject.org
[SECURITY] Fedora 33 Update: xstream-1.4.18-2.fc33 - package-announce - Fedora Mailing-Lists MITRE lists.fedoraproject.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 174824 SUSE Enterprise Linux Security update for SUSE Manager Server 4.1 (SUSE-SU-2021:0906-1)
  • 198361 Ubuntu Security Notification for XStream vulnerabilities (USN-4943-1)
  • 281980 Fedora Security Update for xstream (FEDORA-2021-d894ca87dc)
  • 281981 Fedora Security Update for xstream (FEDORA-2021-fbad11014a)
  • 375337 IBM Spectrum Control Multiple Vulnerability(6415993)
  • 375827 XStream Arbitrary Code Execution And Multiple vulnerabilities
  • 750401 OpenSUSE Security Update for xstream (openSUSE-SU-2021:0140-1)
  • 980088 Java (maven) Security Update for com.thoughtworks.xstream:xstream (GHSA-4cch-wxpw-8p28)

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