CVE-2026-22028 SUSE CVE security@suse.de SUSE Security Team SUSE CVE-2026-22028 Interim 1 1 2026-03-05T00:18:28Z current 2026-03-05T00:18:28Z 2026-03-05T00:18:28Z cve-database/bin/generate-cvrf-cve.pl 2020-12-27T01:00:00Z CVE-2026-22028 Preact, a lightweight web development framework, JSON serialization protection to prevent Virtual DOM elements from being constructed from arbitrary JSON. A regression introduced in Preact 10.26.5 caused this protection to be softened. In applications where values from JSON payloads are assumed to be strings and passed unmodified to Preact as children, a specially-crafted JSON payload could be constructed that would be incorrectly treated as a valid VNode. When this chain of failures occurs it can result in HTML injection, which can allow arbitrary script execution if not mitigated by CSP or other means. Applications using affected Preact versions are vulnerable if they meet all of the following conditions: first, pass unmodified, unsanitized values from user-modifiable data sources (APIs, databases, local storage, etc.) directly into the render tree; second assume these values are strings but the data source could return actual JavaScript objects instead of JSON strings; and third, the data source either fails to perform type sanitization AND blindly stores/returns raw objects interchangeably with strings, OR is compromised (e.g., poisoned local storage, filesystem, or database). Versions 10.26.10, 10.27.3, and 10.28.2 patch the issue. The patch versions restore the previous strict equality checks that prevent JSON-parsed objects from being treated as valid VNodes. Other mitigations are available for those who cannot immediately upgrade. Validate input types, cast or validate network data, sanitize external data, and use Content Security Policy (CSP). The CVRF data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0). https://www.suse.com/support/security/rating/ SUSE Security Ratings SUSE Linux Enterprise Module for SAP Applications 15 SP4 SUSE Linux Enterprise Module for SAP Applications 15 SP5 SUSE Linux Enterprise Module for SAP Applications 15 SP7 SUSE Linux Enterprise Server for SAP applications 16.0 SUSE Manager Proxy LTS 4.3 SUSE Manager Server LTS 4.3 spacewalk-base spacewalk-base-minimal spacewalk-base-minimal-config spacewalk-html spacewalk-web trento-web trento-web as a component of SUSE Linux Enterprise Module for SAP Applications 15 SP4 trento-web as a component of SUSE Linux Enterprise Module for SAP Applications 15 SP5 trento-web as a component of SUSE Linux Enterprise Module for SAP Applications 15 SP7 trento-web as a component of SUSE Linux Enterprise Server for SAP applications 16.0 spacewalk-base-minimal as a component of SUSE Manager Proxy LTS 4.3 spacewalk-base-minimal-config as a component of SUSE Manager Proxy LTS 4.3 spacewalk-web as a component of SUSE Manager Proxy LTS 4.3 spacewalk-base as a component of SUSE Manager Server LTS 4.3 spacewalk-base-minimal as a component of SUSE Manager Server LTS 4.3 spacewalk-base-minimal-config as a component of SUSE Manager Server LTS 4.3 spacewalk-html as a component of SUSE Manager Server LTS 4.3 spacewalk-web as a component of SUSE Manager Server LTS 4.3 Preact, a lightweight web development framework, JSON serialization protection to prevent Virtual DOM elements from being constructed from arbitrary JSON. A regression introduced in Preact 10.26.5 caused this protection to be softened. In applications where values from JSON payloads are assumed to be strings and passed unmodified to Preact as children, a specially-crafted JSON payload could be constructed that would be incorrectly treated as a valid VNode. When this chain of failures occurs it can result in HTML injection, which can allow arbitrary script execution if not mitigated by CSP or other means. Applications using affected Preact versions are vulnerable if they meet all of the following conditions: first, pass unmodified, unsanitized values from user-modifiable data sources (APIs, databases, local storage, etc.) directly into the render tree; second assume these values are strings but the data source could return actual JavaScript objects instead of JSON strings; and third, the data source either fails to perform type sanitization AND blindly stores/returns raw objects interchangeably with strings, OR is compromised (e.g., poisoned local storage, filesystem, or database). Versions 10.26.10, 10.27.3, and 10.28.2 patch the issue. The patch versions restore the previous strict equality checks that prevent JSON-parsed objects from being treated as valid VNodes. Other mitigations are available for those who cannot immediately upgrade. Validate input types, cast or validate network data, sanitize external data, and use Content Security Policy (CSP). CVE-2026-22028 SUSE Manager Proxy LTS 4.3:spacewalk-base-minimal SUSE Manager Proxy LTS 4.3:spacewalk-base-minimal-config SUSE Manager Proxy LTS 4.3:spacewalk-web SUSE Manager Server LTS 4.3:spacewalk-base SUSE Manager Server LTS 4.3:spacewalk-base-minimal SUSE Manager Server LTS 4.3:spacewalk-base-minimal-config SUSE Manager Server LTS 4.3:spacewalk-html SUSE Manager Server LTS 4.3:spacewalk-web important 8.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H