CVE-2020-26217

CVE-2020-26217 is a high-severity vulnerability in Xstream with a CVSS 3.x base score of 8.0. Its EPSS exploit-prediction score of 85% places it in the 100th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-78.

Key facts

• Severity: High (CVSS 3.x base score 8.0)
• CVSS v2: 9.3
• EPSS exploit prediction: 85% (100th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-78
• Affected product: Xstream
• Published: 2020-11-16
• Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2020-26217?

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.

How severe is CVE-2020-26217?

CVE-2020-26217 has a CVSS 3.x base score of 8.0, rated high severity. It is exploitable over network with high attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-26217 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 85% (100th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-26217?

CVE-2020-26217 primarily affects Xstream. In total, 37 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-26217?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2020-26217 published?

CVE-2020-26217 was published on 2020-11-16 and last updated on 2026-06-17.

References

• https://github.com/x-stream/xstream/commit/0fec095d534126931c99fd38e9c6d41f5c685c1a
• https://github.com/x-stream/xstream/security/advisories/GHSA-mw36-7c6c-q4q2
• https://lists.apache.org/thread.html/r2de526726e7f4db4a7cb91b7355070779f51a84fd985c6529c2f4e9e%40%3Cissues.activemq.apache.org%3E
• https://lists.apache.org/thread.html/r7c9fc255edc0b9cd9567093d131f6d33fde4c662aaf912460ef630e9%40%3Ccommits.camel.apache.org%3E
• https://lists.apache.org/thread.html/r826a006fda71cc96fc87b6eca4b5d195f19a292ad36cea501682c38c%40%3Cissues.activemq.apache.org%3E
• https://lists.apache.org/thread.html/redde3609b89b2a4ff18b536a06ef9a77deb93d47fda8ed28086fa8c3%40%3Cissues.activemq.apache.org%3E
• https://lists.debian.org/debian-lts-announce/2020/12/msg00001.html
• https://security.netapp.com/advisory/ntap-20210409-0004/
• https://www.debian.org/security/2020/dsa-4811
• https://www.oracle.com//security-alerts/cpujul2021.html
• https://www.oracle.com/security-alerts/cpuApr2021.html
• https://www.oracle.com/security-alerts/cpuapr2022.html
• https://www.oracle.com/security-alerts/cpujan2022.html
• https://www.oracle.com/security-alerts/cpuoct2021.html
• https://x-stream.github.io/CVE-2020-26217.html

Affected products (37)

• cpe:2.3:a:xstream:xstream:*:*:*:*:*:*:*:*
• cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
• cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
• cpe:2.3:a:netapp:snapmanager:*:*:*:*:*:sap:*:*
• cpe:2.3:a:netapp:snapmanager:-:-:*:*:*:oracle:*:*
• cpe:2.3:a:apache:activemq:*:*:*:*:*:*:*:*
• cpe:2.3:a:apache:activemq:5.16.0:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:banking_cash_management:14.2:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:banking_cash_management:14.3:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:banking_cash_management:14.5:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:banking_corporate_lending_process_management:14.2:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:banking_corporate_lending_process_management:14.3:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:banking_corporate_lending_process_management:14.5:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:banking_credit_facilities_process_management:14.2:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:banking_credit_facilities_process_management:14.3:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:banking_credit_facilities_process_management:14.5:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:banking_platform:2.4.0:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:banking_platform:2.7.1:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:banking_platform:2.9.0:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:banking_supply_chain_finance:14.2:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:banking_supply_chain_finance:14.3:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:banking_supply_chain_finance:14.5:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:banking_trade_finance_process_management:14.2:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:banking_trade_finance_process_management:14.3:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:banking_trade_finance_process_management:14.5:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:banking_virtual_account_management:14.2.0:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:banking_virtual_account_management:14.3.0:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:banking_virtual_account_management:14.5.0:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:business_activity_monitoring:11.1.1.9.0:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:business_activity_monitoring:12.2.1.3.0:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:business_activity_monitoring:12.2.1.4.0:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:communications_policy_management:12.5.0:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:endeca_information_discovery_studio:3.2.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:retail_xstore_point_of_service:16.0.6:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:retail_xstore_point_of_service:17.0.4:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:retail_xstore_point_of_service:18.0.3:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:retail_xstore_point_of_service:19.0.2:*:*:*:*:*:*:*

More vulnerabilities in Xstream

• CVE-2019-10173 — Critical (CVSS 9.8): It was found that xstream API version 1.4.10 before 1.4.11 introduced a regression for a previous deserialization flaw.…
• CVE-2013-7285 — Critical (CVSS 9.8): Xstream API versions up to 1.4.6 and version 1.4.10, if the security framework has not been initialized, may allow a…
• CVE-2021-39152 — High (CVSS 8.5): XStream is a simple library to serialize objects to XML and back again. In affected versions this vulnerability may…
• CVE-2021-39150 — High (CVSS 8.5): XStream is a simple library to serialize objects to XML and back again. In affected versions this vulnerability may…
• CVE-2021-39154 — High (CVSS 8.5): XStream is a simple library to serialize objects to XML and back again. In affected versions this vulnerability may…
• CVE-2021-39153 — High (CVSS 8.5): XStream is a simple library to serialize objects to XML and back again. In affected versions this vulnerability may…

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