CVE-2026-45321

Description

On 2026-05-11, between approximately 19:20 and 19:26 UTC, 84 malicious versions across 42 @tanstack/* packages were published to the npm registry. The publishes were authenticated via the legitimate GitHub Actions OIDC trusted-publisher binding for TanStack/router, but the publish workflow itself was not modified. The attacker chained three known vulnerability classes — a pull_request_target "Pwn Request" misconfiguration, GitHub Actions cache poisoning across the fork↔base trust boundary, and runtime memory extraction of the OIDC token from the Actions runner process — to publish credential-stealing malware under a trusted identity. Each affected package received exactly two malicious versions, published a few minutes apart.

CVSS Details

CVSS Score

9.6

Severity

CRITICAL

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Configurations (Affected Products)

No configuration data available.

@tanstack/* packages published between 2026-05-11 19:20 - 19:26 UTC

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

# Conceptual PoC: Detection script for suspicious TanStack package versions
# Check if any @tanstack package was installed during the attack window (2026-05-11 19:20 - 19:26 UTC)

import json
import sys
from datetime import datetime, timezone

def check_package_lock(file_path):
    attack_start = datetime(2026, 5, 11, 19, 20, tzinfo=timezone.utc)
    attack_end = datetime(2026, 5, 11, 19, 26, tzinfo=timezone.utc)
    
    try:
        with open(file_path, 'r') as f:
            data = json.load(f)
        
        print(f"[*] Analyzing {file_path}...")
        
        # Simplified logic for package-lock.json structure
        if 'packages' in data:
            for path, details in data['packages'].items():
                if '@tanstack' in path:
                    # In a real scenario, check the 'integrity' hash or version publication time
                    # Here we just flag the presence of the package for manual review
                    print(f"[!] Suspicious package found: {path}")
                    print(f"    Version: {details.get('version', 'unknown')}")
                    print(f"    Action: Verify this version against official advisories.")
    except FileNotFoundError:
        print("Error: File not found.")
    except Exception as e:
        print(f"Error parsing JSON: {e}")

if __name__ == "__main__":
    if len(sys.argv) > 1:
        check_package_lock(sys.argv[1])
    else:
        print("Usage: python3 check_tanstack.py package-lock.json")

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-45321
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-45321
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-45321/
[4] VulDB https://vuldb.com/cve/CVE-2026-45321
[5] https://github.com/TanStack/router/issues/7383
[6] https://github.com/TanStack/router/security/advisories/GHSA-g7cv-rxg3-hmpx

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-45321", "sourceIdentifier": "[email protected]", "published": "2026-05-12T01:16:46.820", "lastModified": "2026-05-12T01:16:46.820", "vulnStatus": "Received", "cveTags": [], "descriptions": [{"lang": "en", "value": "On 2026-05-11, between approximately 19:20 and 19:26 UTC, 84 malicious versions across 42 @tanstack/* packages were published to the npm registry. The publishes were authenticated via the legitimate GitHub Actions OIDC trusted-publisher binding for TanStack/router, but the publish workflow itself was not modified. The attacker chained three known vulnerability classes — a pull_request_target \"Pwn Request\" misconfiguration, GitHub Actions cache poisoning across the fork↔base trust boundary, and runtime memory extraction of the OIDC token from the Actions runner process — to publish credential-stealing malware under a trusted identity. Each affected package received exactly two malicious versions, published a few minutes apart."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H", "baseScore": 9.6, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 6.0}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-506"}]}], "references": [{"url": "https://github.com/TanStack/router/issues/7383", "source": "[email protected]"}, {"url": "https://github.com/TanStack/router/security/advisories/GHSA-g7cv-rxg3-hmpx", "source": "[email protected]"}]}}