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Fencer Vulns
high 8.0

CVE-2020-26217 in the critical feed json

Remote Code Execution in XStream

published 2020-11-16 5 y ago modified 2026-10-07 32 d ago also BIT-activemq-2020-26217 , EUVD-2020-1464 , GHSA-mw36-7c6c-q4q2

cvss
8.0
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
85.0%
EPSS 85.0% chance of exploitation in 30 days, percentile 99.7%
public exploits
0
none known, plus a Nuclei check

Summary

XStream before version 1.4.14 is vulnerable to Remote Code Execution.The vulnerability may allow a remote attacker to run arbitrary shell commands only by manipulating the processed input stream. Only users who rely on blocklists are affected. Anyone using XStream's Security Framework allowlist is not affected. The linked advisory provides code workarounds for users who cannot upgrade. The issue is fixed in version 1.4.14.

Patch / fix

  • maven com.thoughtworks.xstream:xstream 1.4.14-java7
  • bitnami activemq 5.15.14
  • xstream xstream 1.4.14
  • apache activemq 5.15.14
  • libxstream-java Debian 14, Debian 13, Debian 12 1.4.14-1

debian advisories DEBIAN-CVE-2020-26217

  • libxstream-java Ubuntu 18.04 LTS 1.4.11.1-1~18.04.1
  • libxstream-java Ubuntu 20.04 LTS 1.4.11.1-1ubuntu0.1
  • libxstream-java Ubuntu Pro 14.04 LTS 1.4.7-1ubuntu0.1+esm2
  • libxstream-java Ubuntu Pro 16.04 LTS 1.4.8-1ubuntu0.1+esm3

ubuntu advisories UBUNTU-CVE-2020-26217

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • xstream RHEL 7 1.3.1-12.el7_9
  • xstream-javadoc RHEL 7 1.3.1-12.el7_9

red hat advisories RHSA-2021:0162

  • xpp3 Manager Server Module 4.1 1.1.4c-11.2.2
  • smdba Manager Server Module 4.1 1.7.8-0.3.6.2
  • rhnlib Manager Server Module 4.1, Manager Proxy Module 4.1 4.1.3-4.3.2
  • cobbler Manager Server Module 4.1 3.0.0+git20190806.32c4bae0-5.6.4
  • xstream Manager Server Module 4.1 1.4.15-3.5.2
  • mgr-osad Manager Server Module 4.1, Manager Proxy Module 4.1 4.1.5-2.9.4
  • mgr-libmod Manager Server Module 4.1 4.1.7-3.16.2
  • susemanager Manager Server Module 4.1 4.1.24-3.20.2

suse advisories SUSE-SU-2021:0906-1SUSE-SU-2021:0176-1

  • xstream openSUSE Tumbleweed 1.4.18-1.1
  • xstream openSUSE Leap 15.2 1.4.15-lp152.2.3.1

opensuse advisories openSUSE-SU-2024:10592-1openSUSE-SU-2021:0140-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-26217 updated cvss 9.0

XStream: remote code execution due to insecure XML deserialization when relying on blocklists

  • Red Hat BPM Suite 6 xstream
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Integration Camel K 1 xstream Red Hat Integration Camel Quarkus 1 xstream
    affected: workaround, no fix available
  • Red Hat JBoss BRMS 6 xstream Red Hat JBoss Data Grid 7 xstream Red Hat JBoss Fuse Service Works 6 xstream
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Data Grid 8.1.1
    fixed: vendor fix RHSA-2021:0433
  • Red Hat Enterprise Linux Client Optional (v. 7) xstream 1.3.1-12.el7_9, xstream-javadoc 1.3.1-12.el7_9 Red Hat Enterprise Linux ComputeNode Optional (v. 7) xstream 1.3.1-12.el7_9, xstream-javadoc 1.3.1-12.el7_9 Red Hat Enterprise Linux Server Optional (v. 7) xstream 1.3.1-12.el7_9, xstream-javadoc 1.3.1-12.el7_9 Red Hat Enterprise Linux Workstation Optional (v. 7) xstream 1.3.1-12.el7_9, xstream-javadoc 1.3.1-12.el7_9
    fixed: vendor fix RHSA-2021:0162
  • Red Hat Fuse 7.10
    fixed: vendor fix RHSA-2021:5134
  • Red Hat Fuse/AMQ 6.3.18
    fixed: vendor fix RHSA-2021:0384
  • Red Hat Integration
    fixed: vendor fix RHSA-2021:3205
show 4 more
  • Red Hat Integration Camel Quarkus 2
    fixed: vendor fix RHSA-2021:4767
  • Red Hat RHDM 7.9.1
    fixed: vendor fix RHSA-2021:0106
  • Red Hat RHPAM 7.9.1
    fixed: vendor fix RHSA-2021:0105
  • Red Hat OpenShift Container Platform 3.11 jenkins Red Hat OpenShift Container Platform 4 jenkins
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
total
Assessed
32 d ago

Exploit prediction

84.97% chance of exploitation in the next 30 days, higher than 99.7% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • Nuclei template XStream <1.4.14 - Remote Code Execution nuclei detection template
  • x-stream.github.io https://x-stream.github.io/CVE-2020-26217.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 8.0 CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H
GitHub 3.1 8.0 CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H
NVD 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 9.3 AV:N/AC:M/Au:N/C:C/I:C/A:C
OSV 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
maven com.thoughtworks.xstream:xstream
<1.4.14-java7
1.4.14-java7
bitnami activemq
<5.15.14
>=5.16.0, <=5.16.0
5.15.14

Affected products

  • x-stream xstream

Classification

Weakness
  • CWE-78 Improper Neutralization of Special Elements used in an OS Command

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.