GHSA-27f5-xjrr-q9ff

Source

https://github.com/advisories/GHSA-27f5-xjrr-q9ff

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-27f5-xjrr-q9ff/GHSA-27f5-xjrr-q9ff.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-27f5-xjrr-q9ff

Published

2026-05-19T14:35:05Z

Modified

2026-09-10T03:50:45Z

Severity

9.6 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H CVSS Calculator

Summary

Malware in @opensearch-project/opensearch

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/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

Database specific

{
    "cwe_ids":  [
        "CWE-506"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-05-19T14:35:05Z",
    "nvd_published_at":  null,
    "severity":  "CRITICAL"
}

References

Affected packages

npm

@opensearch-project/opensearch

Package

Name: @opensearch-project/opensearch; View open source insights on deps.dev
Purl: pkg:npm/%40opensearch-project/opensearch

Affected ranges

Affected versions

3.*

3.5.3

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-27f5-xjrr-q9ff/GHSA-27f5-xjrr-q9ff.json"

@opensearch-project/opensearch

Package

Name: @opensearch-project/opensearch; View open source insights on deps.dev
Purl: pkg:npm/%40opensearch-project/opensearch

Affected ranges

Affected versions

3.*

3.6.2

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-27f5-xjrr-q9ff/GHSA-27f5-xjrr-q9ff.json"

@opensearch-project/opensearch

Package

Name: @opensearch-project/opensearch; View open source insights on deps.dev
Purl: pkg:npm/%40opensearch-project/opensearch

Affected ranges

Affected versions

3.*

3.7.0

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-27f5-xjrr-q9ff/GHSA-27f5-xjrr-q9ff.json"

@opensearch-project/opensearch

Package

Name: @opensearch-project/opensearch; View open source insights on deps.dev
Purl: pkg:npm/%40opensearch-project/opensearch

Affected ranges

Affected versions

3.*

3.8.0

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-27f5-xjrr-q9ff/GHSA-27f5-xjrr-q9ff.json"