GHSA-27f5-xjrr-q9ff Malware in @opensearch-project/opensearch
Attackers injected malicious code into specific OpenSearch npm package versions, allowing full system compromise upon installation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is GHSA-27f5-xjrr-q9ff?
GHSA-27f5-xjrr-q9ff is a vulnerability in @opensearch-project/opensearch, published on 19 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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 |
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.
References
GHSA-g7cv-rxg3-hmpx https://github.com/TanStack/router/issues/7383
Which versions are affected by GHSA-27f5-xjrr-q9ff?
2 open source packages ship an affected version, including @opensearch-project/opensearch.
| Package | Affected | Fixed in |
|---|---|---|
@opensearch-project/opensearch npm | All versions | None |
@opensearch-project/opensearch npm | All versions | None |
How do I fix GHSA-27f5-xjrr-q9ff?
No fix has been published for GHSA-27f5-xjrr-q9ff yet. Limit exposure of the affected software until one is available.
Is GHSA-27f5-xjrr-q9ff being exploited?
There is no known exploitation of GHSA-27f5-xjrr-q9ff in the wild and no public exploit code.