Security Digest · Critical advisory (no CVE assigned)
GHSA-27f5-xjrr-q9ff: Malware in @opensearch-project/opensearch
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.
CVSS 9.6 Critical GitHub-reviewed · critical
Should you act?
- Malicious code, not a bug. If any listed version was ever installed, assume the machine and every secret on it are compromised: remove it, rotate credentials, rebuild.
- Only if you depend on one of the packages below, directly or transitively, in a vulnerable version. Check your lockfile with
npm audit (or: npm ls <package>). - No CVE has been assigned, so it will not appear in CVE-based scanners that ignore GitHub advisories.
npm audit,pip-auditand Dependabot do read GitHub advisories.
Affected packages
| Ecosystem | Package | Vulnerable | First fixed |
|---|---|---|---|
| npm | @opensearch-project/opensearch | = 3.5.3 | none listed |
| npm | @opensearch-project/opensearch | = 3.6.2 | none listed |
| npm | @opensearch-project/opensearch | = 3.7.0 | none listed |
| npm | @opensearch-project/opensearch | = 3.8.0 | none listed |
Details
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/NewYork) | |---------|----------------|------------------------------| | 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 |
Remediation
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.
CVSS: 9.6 (v3.1) CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Sources and references
- GitHub Advisory GHSA-27f5-xjrr-q9ff github.com
- github.com github.com