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CVE-2026-45321

Embedded Malicious Code — is CVE-2026-45321real, exploitable, or a false positive? Here's the community ground truth.

Critical · CVSS 9.6EPSS 1.6%CISA KEVCWE-506 · Embedded Malicious Code

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

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.

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TruePositive verdict for CVE-2026-45321
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Community ground truth

Community verdict

2 verdicts
Not a real issue

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Community real-world severity: Critical (Critical 2) — CVSS base score 9.6

In line with its CVSS base score.

Field notes & remediation

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  • 0
    Field note · Waleed AzizCurated

    Confirmed exploited in the wild — listed in the CISA KEV catalog (added 2026-05-27). Linked to known ransomware campaigns. Treat as real and prioritize patching over triage.

Same weaknessCWE-506 · Embedded Malicious Code.