There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - XStream is a Java library to serialize objects to XML and back again. In XStream before version 1.4.15, is
    vulnerable to an Arbitrary File Deletion on the local host when unmarshalling. The vulnerability may allow
    a remote attacker to delete arbitrary know files on the host as log as the executing process has
    sufficient rights 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 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. (CVE-2020-26259)

Several security vulnerabilities were discovered in XStream, a Java library to serialize objects to XML and back again.

CVE-2020-26258

XStream is vulnerable to a Server-Side Forgery Request which 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.

CVE-2020-26259

Xstream is vulnerable to an Arbitrary File Deletion on the local host when unmarshalling. The vulnerability may allow a remote attacker to delete arbitrary known files on the host as long as the executing process has sufficient rights only by manipulating the processed input stream.

For Debian 9 stretch, these problems have been fixed in version 1.4.11.1-1+deb9u1.

We recommend that you upgrade your libxstream-java packages.

For the detailed security status of libxstream-java please refer to its security tracker page at:
https://security-tracker.debian.org/tracker/libxstream-java

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote Ubuntu 18.04 LTS / 20.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-4943-1 advisory.

    Zhihong Tian and Hui Lu found that XStream was vulnerable to remote code execution. A remote attacker     could run arbitrary shell commands by manipulating the processed input stream. This issue affected only     affected Ubuntu 20.10. (CVE-2020-26217)

    It was discovered that XStream was vulnerable to server-side forgery attacks. A remote attacker could     request data from internal resources that are not publicly available only by manipulating the processed     input stream. This issue only affected Ubuntu 20.10. (CVE-2020-26258)

    It was discovered that XStream was vulnerable to arbitrary file deletion on the local host. A remote     attacker could use this to delete arbitrary known files on the host as long as the executing process had     sufficient rights only by manipulating the processed input stream. This issue only affected Ubuntu 20.10.
    (CVE-2020-26259)

    It was discovered that XStream was vulnerable to denial of service, arbitrary code execution, arbitrary     file deletion and server-side forgery attacks. A remote attacker could cause any of those issues by     manipulating the processed input stream. (CVE-2021-21341, CVE-2021-21342, CVE-2021-21343 CVE-2021-21344,     CVE-2021-21345, CVE-2021-21346, CVE-2021-21347, CVE-2021-21348, CVE-2021-21349, CVE-2021-21350,     CVE-2021-21351)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Ubuntu 18.04 LTS / 20.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-4714-1 advisory.

    Zhihong Tian and Hui Lu found that XStream was vulnerable to remote code execution. A remote attacker     could run arbitrary shell commands by manipulating the processed input stream. (CVE-2020-26217)

    It was discovered that XStream was vulnerable to server-side forgery attacks. A remote attacker could     request data from internal resources that are not publicly available only by manipulating the processed     input stream. (CVE-2020-26258)

    It was discovered that XStream was vulnerable to arbitrary file deletion on the local host. A remote     attacker could use this to delete arbitrary known files on the host as long as the executing process had     sufficient rights only by manipulating the processed input stream. (CVE-2020-26259)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Liaogui Zhong discovered two security issues in XStream, a Java library to serialise objects to XML and back again, which could result in the deletion of files or server-side request forgery when unmarshalling.

This update for xstream fixes the following issues :

xstream was updated to version 1.4.15.

  - CVE-2020-26217: Fixed a remote code execution due to     insecure XML deserialization when relying on blocklists     (bsc#1180994).

  - CVE-2020-26258: Fixed a server-side request forgery     vulnerability (bsc#1180146).

  - CVE-2020-26259: Fixed an arbitrary file deletion     vulnerability (bsc#1180145).

This update was imported from the SUSE:SLE-15-SP2:Update update project.

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-017728 advisory.

    XStream is a Java library to serialize objects to XML and back again. In XStream before version 1.4.15, is     vulnerable to an Arbitrary File Deletion on the local host when unmarshalling. The vulnerability may allow     a remote attacker to delete arbitrary know files on the host as log as the executing process has     sufficient rights 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 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.

Tenable has extracted the preceding description block directly from the Unity Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Ubuntu 14.04 LTS / 16.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-6978-1 advisory.

    It was discovered that XStream incorrectly handled parsing of certain crafted XML documents. A remote     attacker could possibly use this issue to read arbitrary files. (CVE-2016-3674)

    Zhihong Tian and Hui Lu found that XStream was vulnerable to remote code execution. A remote attacker     could run arbitrary shell commands by manipulating the processed input stream. (CVE-2020-26217)

    It was discovered that XStream was vulnerable to server-side forgery attacks. A remote attacker could     request data from internal resources that are not publicly available only by manipulating the processed     input stream. (CVE-2020-26258)

    It was discovered that XStream was vulnerable to arbitrary file deletion on the local host. A remote     attacker could use this to delete arbitrary known files on the host as long as the executing process had     sufficient rights only by manipulating the processed input stream. (CVE-2020-26259)

    It was discovered that XStream was vulnerable to denial of service, arbitrary code execution, arbitrary     file deletion and server-side forgery attacks. A remote attacker could cause any of those issues by     manipulating the processed input stream. (CVE-2021-21341, CVE-2021-21342, CVE-2021-21343, CVE-2021-21344,     CVE-2021-21345, CVE-2021-21346, CVE-2021-21347, CVE-2021-21348, CVE-2021-21349, CVE-2021-21350,     CVE-2021-21351)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Published	Updated	Severity
416336	SCA: security update for com.thoughtworks.xstream:xstream (GHSA-jfvx-7wrx-43fh)	Tenable Self-Hosted Container Security	SCA Checks	1/23/2025	7/2/2026	medium
416336	SCA: security update for com.thoughtworks.xstream:xstream (GHSA-jfvx-7wrx-43fh)	Tenable Cloud Security	SCA Checks	1/23/2025	7/2/2026	medium
144681	Debian DLA-2507-1 : libxstream-java security update	Nessus	Debian Local Security Checks	1/4/2021	1/31/2024	high
149408	Ubuntu 18.04 LTS / 20.04 LTS : XStream vulnerabilities (USN-4943-1)	Nessus	Ubuntu Local Security Checks	5/12/2021	9/3/2025	critical
145542	Ubuntu 18.04 LTS / 20.04 LTS : XStream vulnerabilities (USN-4714-1)	Nessus	Ubuntu Local Security Checks	1/29/2021	8/27/2024	high
144818	Debian DSA-4828-1 : libxstream-java - security update	Nessus	Debian Local Security Checks	1/11/2021	1/30/2024	high
145314	openSUSE Security Update : xstream (openSUSE-2021-140)	Nessus	SuSE Local Security Checks	1/25/2021	1/26/2024	high
313768	Unity Linux 20.1070e Security Update: xstream (UTSA-2026-017728)	Nessus	Unity Linux Local Security Checks	5/11/2026	5/11/2026	medium
206123	Ubuntu 14.04 LTS / 16.04 LTS : XStream vulnerabilities (USN-6978-1)	Nessus	Ubuntu Local Security Checks	8/22/2024	8/27/2024	critical

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