CVE-2020-26217

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

82.71% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 99.6% of scored records. A rank, not a probability.

NVD base score

8.8 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Analyzed. NVD last modified this record on 2026-10-07.

Red Hat severity

Important. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2020-11-16 21:00Z5 YR AGO

Last updated

2026-10-07 18:51Z22 DAYS AGO

Reserved

2020-10-01

Assigning CNA

GitHub_M

Record state

PUBLISHED

Severity

High (CVSS 8.0)

CNA CVSS vector

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

Weaknesses

• CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')Base
• CWE-502Deserialization of Untrusted DataBase

Data version

5.2

Document digest

ffe6aa7ee06f48cef9c9a898c2f064cc1ea36061fa2bc6bedb92980dd9e01695

• github.comhttps://github.com/x-stream/xstream/security/advisories/GHSA-mw36-7c6c-q4q2x_refsource_CONFIRM
• x-stream.github.iohttps://x-stream.github.io/CVE-2020-26217.htmlx_refsource_CONFIRM
• github.comhttps://github.com/x-stream/xstream/commit/0fec095d534126931c99fd38e9c6d41f5c685c1ax_refsource_CONFIRM
• lists.debian.org[debian-lts-announce] 20201201 [SECURITY] [DLA 2471-1] libxstream-java security updatehttps://lists.debian.org/debian-lts-announce/2020/12/msg00001.htmlmailing-listx_refsource_MLIST
• www.debian.orgDSA-4811https://www.debian.org/security/2020/dsa-4811vendor-advisoryx_refsource_DEBIAN
• lists.apache.org[activemq-issues] 20201230 [jira] [Created] (AMQ-8107) Does ActiveMQ use the affected functionality within Xstream libraries for CVE-2020-26217https://lists.apache.org/thread.html/redde3609b89b2a4ff18b536a06ef9a77deb93d47fda8ed28086fa8c3%40%3Cissues.activemq.apache.org%3Emailing-listx_refsource_MLIST
• lists.apache.org[activemq-issues] 20201230 [jira] [Updated] (AMQ-8107) Does ActiveMQ use the affected functionality within Xstream libraries for CVE-2020-26217https://lists.apache.org/thread.html/r826a006fda71cc96fc87b6eca4b5d195f19a292ad36cea501682c38c%40%3Cissues.activemq.apache.org%3Emailing-listx_refsource_MLIST
• lists.apache.org[activemq-issues] 20210104 [jira] [Resolved] (AMQ-8107) Does ActiveMQ use the affected functionality within Xstream libraries for CVE-2020-26217https://lists.apache.org/thread.html/r2de526726e7f4db4a7cb91b7355070779f51a84fd985c6529c2f4e9e%40%3Cissues.activemq.apache.org%3Emailing-listx_refsource_MLIST
• www.oracle.comhttps://www.oracle.com/security-alerts/cpuApr2021.htmlx_refsource_MISC
• security.netapp.comhttps://security.netapp.com/advisory/ntap-20210409-0004/x_refsource_CONFIRM
• www.oracle.comhttps://www.oracle.com//security-alerts/cpujul2021.htmlx_refsource_MISC
• lists.apache.org[camel-commits] 20211006 [camel] branch main updated: Camel-XStream: Added a test about CVE-2020-26217https://lists.apache.org/thread.html/r7c9fc255edc0b9cd9567093d131f6d33fde4c662aaf912460ef630e9%40%3Ccommits.camel.apache.org%3Emailing-listx_refsource_MLIST
• www.oracle.comhttps://www.oracle.com/security-alerts/cpuoct2021.htmlx_refsource_MISC
• www.oracle.comhttps://www.oracle.com/security-alerts/cpujan2022.htmlx_refsource_MISC
• www.oracle.comhttps://www.oracle.com/security-alerts/cpuapr2022.htmlx_refsource_MISC