Summary
Overview
The OpenSearch Project has sustained a security incident involving an external actor gaining force-push permissions within the project's CI infrastructure to embed malicious packages into four release versions of @opensearch-project/opensearch. Users are instructed to immediately take actions recommended in the Remediation section of this advisory.
Affected Versions
Package: @opensearch-project/opensearch
| Version | Published (UTC) | Published (America/New_York) |
|---|---|---|
| 3.5.3 | 2026-05-12T00:47:39Z | May 11, 2026, 8:47:39 PM EDT |
| 3.6.2 | 2026-05-12T00:29:34Z | May 11, 2026, 8:29:34 PM EDT |
| 3.7.0 | 2026-05-12T00:42:29Z | May 11, 2026, 8:42:29 PM EDT |
| 3.8.0 | 2026-05-12T00:43:54Z | May 11, 2026, 8:43:54 PM EDT |
References
GHSA-g7cv-rxg3-hmpx
https://github.com/TanStack/router/issues/7383
Impact
GHSA-27F5-XJRR-Q9FF has a CVSS score of 9.6 (Critical). The vector is network-reachable, no privileges required, and user interaction required. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. No fixed version is listed yet, so configuration controls and monitoring matter more in the interim.
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
Remediation advice
Any computer that has these package versions installed or updated between 00:00 UTC 12 May 2026 (8:00 PM EDT 11 May 2026) and 10:00 UTC 12 May 2026 (6:00 AM EDT 12 May 2026) should be considered fully compromised. Steps should immediately be taken to prevent further compromise.
- All secrets and keys stored on that computer should be rotated immediately from an alternate system.
- The affected packages should be removed immediately, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.
Frequently Asked Questions
- What is GHSA-27F5-XJRR-Q9FF? GHSA-27F5-XJRR-Q9FF is a critical-severity security vulnerability in @opensearch-project/opensearch (npm), affecting versions = 3.5.3. No fixed version is listed yet.
- How severe is GHSA-27F5-XJRR-Q9FF? GHSA-27F5-XJRR-Q9FF has a CVSS score of 9.6 (Critical). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
- Which versions of @opensearch-project/opensearch are affected by GHSA-27F5-XJRR-Q9FF? @opensearch-project/opensearch (npm) versions = 3.5.3 is affected.
- Is there a fix for GHSA-27F5-XJRR-Q9FF? No fixed version is listed for GHSA-27F5-XJRR-Q9FF yet. Monitor the advisory for updates and apply mitigations in the interim.
- Is GHSA-27F5-XJRR-Q9FF exploitable, and should I be worried? Whether GHSA-27F5-XJRR-Q9FF is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether GHSA-27F5-XJRR-Q9FF is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.