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GHSA-j22f-vq7h-c4qm
devalueImpact
stringify and uneval serialize a typed array by emitting its backing ArrayBuffer, not just the view. In the case of a Node Buffer object, the backing buffer is a process-wide shared pool, meaning unrelated memory can be serialized into a response that is then sent to the client. For a Node Buffer the backing store is Node's process-wide shared pool, so serializing a small Buffer copies up to 64 KB of unrelated process memory — including bytes from other in-flight requests — into the output. In an SSR framework (SvelteKit, Nuxt) a public page whose load() returns a 2-byte Buffer, or a small file read with readFileSync, ships another user's request body / Authorization header in its HTML. Unauthenticated, silent, ~43,000× amplification.
This is serialization-side, so the parse/unflatten prototype-pollution and DoS guards do not apply — it fires on every SSR render, not only when parsing untrusted input.
Workarounds
Convert Node Buffer objects to Uint8Array:
payload = {
- buffer
+ buffer: new Uint8Array(buffer)
}
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The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the confidentiality of the information.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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